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PROPOSED AD PRECISE FLIGHT, INC.:
Docket No. FAA-2004-19354; Directorate Identifier 2004-CE-30-AD.

When is the last date I can submit comments on this proposed AD?

(a) We must receive comments on this proposed airworthiness directive (AD)
    by April 29, 2005.

What other ADs are affected by this action?

(b) None.

What airplanes are affected by this AD?

(c) This AD affects Models SVS I and SVS IA standby vacuum systems  (SVS),
    installed on,  but not  limited to,  the following  aircraft that  are
    certificated in any category. These systems can be installed under the
    applicable  supplemental  type  certificate  (STC)  or  through  field
    approval:

--------------------------------------------------------------------------
                                                MAKE AND MODEL/SERIES     
               AFFECTED STC                           AIRCRAFT            
--------------------------------------------------------------------------
SA2160NM..................................  Raytheon Beech Models 23,
                                             A23, A23A, A23-19, 19A,
                                             B19, B19A, A23-24, B23,
                                             C23, A24, A24R, B24R, C24R,
                                             35, A35, B35, C35, D35,
                                             E35, F35, G35, 35R, H35,
                                             J35, K35, M35, N35, P35,
                                             S35, V35, V35A, V35B, 35-
                                             33, 35-A33, 35-B33, 35-C33,
                                             35-C33A, E33, E33A, E33C,
                                             F33, F33A, F33C, G33, 36,
                                             A36, A36TC, B36TC, 4S(YT-
                                             34), A45(T-34A, B-45),
                                             D45(T-34B), and Series 77.
SA2161NM..................................  Raytheon Beech Model V35B.
SA2162NM..................................  The Cessna Aircraft Company
                                             Models 321 (Navy OE-2),
                                             172N, 172P, 172D, 172M,
                                             172L, 172I, 172H (USAF T-
                                             41A), 172F (USAF T-41A),
                                             172E, 172C, 172, 172Q,
                                             172B, TR182, T182, 305B
                                             (Military T0-1D, 0-1D, 0-
                                             1F), R172E Series, 175C,
                                             175B, 175A, R172F (USAF T-
                                             41D), P172D, 150, 150A,
                                             150C, 150B, 150D, A152,
                                             A150M, 150M, 152, A150L,
                                             150K, 150J, 150H, 150G,
                                             150F, 210-5 (205), 210-5A
                                             (205A), T210R, P210R,
                                             T210N, 210N, P210N, 210M,
                                             T210L, 210K, T210K, 210J,
                                             T210H, 210H, T210G, T210F,
                                             210F, 210D, 210C, 210B,
                                             210A, 210L, 210, A185F,
                                             A185E, 185E, 185C, 185B,
                                             185A, 185, 140A, 305A (USAF
                                             0-1A), 305C (USAF 0-1E),
                                             305D (USAF 0-1G), 305F,
                                             120, 170B, 170A, 170, 207A,
                                             T207, 207, 206, P206B,
                                             P206, P206C, TU206A,
                                             TU206G, TU206E, TU206C,
                                             P206D, U206G, U206F, U206E,
                                             U206D, U206C, U206A,
                                             TP206E, TP206D, TP206C,
                                             TP206A, P206E, TU206D,
                                             T188C, A188B, A188, 188A,
                                             and 188.
SA2164NM..................................  The Cessna Aircraft Company
                                             Model 180A.
SA2167NM..................................  The New Piper Aircraft, Inc.
                                             Models PA-16S and PA-16,
                                             Series PA-24, Models PA-24-
                                             400, PA-24-250, PA-24, PA-
                                             24-260, PA-18S-"135", PA-
                                             18"105" (Special), PA-
                                             18AS-"135", PA-18A-
                                             "135", PA-18-"150", PA-
                                             19S, PA-19 (Army L-18C), PA-
                                             18S-"150", and PA-18-
                                             "135" (Army L-21B),
                                             Series PA-18, Models PA-18-
                                             "125" (Army L-21A), PA-
                                             18S, PA-18A, PA-18, and PA-
                                             18S-"125", Series PA-19
                                             and PA-20, Models PA-20, PA-
                                             20S, PA-20-"135", PA-20-
                                             "115", and PA-22S-160,
                                             Series PA-22, Models PA-22-
                                             160, PA-22S-150, PA-22-150,
                                             PA-22, PA-22-108, PA-22-
                                             135, and PA-22S-135, Series
                                             PA-28, Model PA-28R-200,
                                             Series PA-28S and PA-28R,
                                             Models PA-28-236, PA-28-
                                             201T, PA-28R-180, PA-28RT-
                                             201T, PA-28RT-201, PA-28R-
                                             201, PA-28-181, PA-28S-180,
                                             PA-28R-201T, PA-28S-160, PA-
                                             28-235, PA-28-180, PA-28-
                                             161, PA-28-160, PA-28-151,
                                             PA-28-150, and PA-28-140,
                                             Series PA-25 (Normal
                                             Category (Cat.)), Models PA-
                                             25-260 (Normal Cat.), PA-25-
                                             235 (Normal Cat.), PA-25
                                             (Normal Cat.), L-14, PA-
                                             12S, PA-12, PA-14, PA-15,
                                             PA-17, PA-38-112, PA-46-
                                             310P, and PA-32-260, Series
                                             PA-32 and PA-32R, Models PA-
                                             32-300, PA-32-301T, PA-32-
                                             301, PA-32R-301T, PA-32R-
                                             301(HP), PA-32R-301(SP), PA-
                                             32RT-300T, PA-32RT-300, PA-
                                             32R-300, and PA-32S-300,
                                             Series PA-36, Models PA-36-
                                             375 (Normal Cat.), PA-36-
                                             300 (Normal Cat.), and PA-
                                             36-285 (Normal Cat.).
SA2168NM..................................  Learjet Inc. Model Learjet
                                             24D.
                                            Mooney Aircraft Corporation
                                             Models M20C, M20M, M20K,
                                             M20J, M20G, M20B, M20A,
                                             M20, M20F, M20E, and M22.

SA2683NM..................................  Aermacchi S.p.A. Models
                                             F.260, F.260B, S.205-22/R,
                                             S.205-18/F, S.205-18/R,
                                             S.205-20/F, S.205-20/R,
                                             S.208A, and S.208.
                                            Aerocar, Incorporated Model
                                             I.
                                            Aerodifusion, S.L. Model
                                             Jodel D-1190S.
                                            Aeromere S.A. Model Falco
                                             F.8.L.
                                            Aeronautica Macchi S.p.A.
                                             Models AL60, AL60-B, AL60-
                                             F5, and AL60-C5.
                                            Aeronautica Macchi S.p.A. &
                                             Aerfer-Industrie
                                             Aerospaziali Meridionali
                                             S.p.A. Model AM-3.
                                            Aeronca Aircraft Corporation
                                             Models S15AC and 15AC.
                                            Ag Cat Corporation Models G-
                                             164B, G-164, and G-164A.
                                            Alliance Aircraft Group, LLC
                                             Models H-395 (USAF L-28A or
                                             U-10B), H-250, H-295 (USAF
                                             U-10D), HT-295, H-391 (USAF
                                             YL-24), H-391B, H-700, and
                                             H-395A.
                                            American Champion Aircraft
                                             Corp. Models 7AC, 7FC,
                                             7ACA, S7AC, 7BCM (L-16A),
                                             7CCM (L-16B), 7DC, S7DC,
                                             7EC, S7EC, 7ECA, 7GC, 7GCA,
                                             7GCAA, 7GCB, 7GCBA, 7GCBC,
                                             7HC, 7JC, 7KC, 7KCAB, 11BC,
                                             S11AC, S11BC, 11AC, 11CC,
                                             S11CC, 8KCAB, and 8GCBC.
                                            Arctic Aircraft Company,
                                             Inc. Models S-1A, S-1A-65F,
                                             S-1A-85F, S-1A-90F, S-1B2,
                                             S-1B1 (Army L-6), and S-1B1
                                             (Army XL-6).
                                            Augustair, Inc. Models
                                             2150A, 2180, and 2150.
                                            Avions Jodel Models D-1190,
                                             150, D-140-B, and DR-1050.
                                            Bellanca Aircraft
                                             Corporation Models 14-19-2,
                                             14-19-3A, 17-30, 17-31, 17-
                                             31TC, 14-9, 14-9L, 14-12F-
                                             3, 14-13, 14-13-2, 14-13-3,
                                             14-13-3W, 17-30A, 17-31A,
                                             and 17-31ATC.
                                            Biemond, C. Model Teal CB1.
                                            Board, G.R. Model Columbia
                                             XJL-1.
                                            Booth, Lee F. dba
                                             Taylorcraft Aerospace
                                             Models F21, F21A, and F19.
                                            Chaparral Motors, Inc.
                                             Models 2T-1A-1 and 2T-1A-2.
                                            Clark Aircraft, Inc. Models
                                             12 and 1000.
                                            Commander Aircraft Company
                                             Models 114A, 112, 112B,
                                             112TCA, 114, and 112TC.
                                            C. Itoh Aircraft Maintenance
                                             and Engineering Co., Ltd.
                                             Model N-62.
                                            DaimlerChrysler Aerospace AG
                                             Models Bolkow Jr., BO-209-
                                             150.
                                            FV & RV, BO-209-160 FV & RV,
                                             and BO-209-150 FF.
                                            Flugzeugwerke Altenrheim AG
                                             (FFA) Model AS 202/15
                                             "BRAVO".
                                            Found Brothers Aviation
                                             Limited Model FBA-2C.
                                            Fuji Heavy Industries, Ltd.
                                             Models FA-200-180AO, FA-200-
                                             180, and FA-200-160.
                                            Funk Aircraft Company Model
                                             Funk C.
                                            Goodyear Aircraft
                                             Corporation Model GA-22A.
                                            Gulfstream Aerospace
                                             Corporation Model 111.
                                            Jamieson Corporation, The
                                             Model J-2-L1B.
                                            Kearns, Edward Scott Model
                                             Trojan A-2.
                                            Luscombe Aircraft
                                             Corporation Model 11A.
                                            Luscombe, The Don, Aviation
                                             History Foundation, Inc.
                                             Models T-8F, 8A, 8E, 8D,
                                             8B, 8, 8F, and 8C.
                                            Maule Aerospace Technology,
                                             Inc. Models Bee Dee M-4-
                                             210, Bee Dee M-4-180S, Bee
                                             Dee M-4-180C, Bee Dee M-4T,
                                             Bee Dee M-4-210S, Bee Dee M-
                                             4S, Bee Dee M-4-210T, Bee
                                             Dee M-4-210C, Bee Dee M-4-
                                             220S, Bee Dee M-4-220T, Bee
                                             Dee M-5-180C, Bee Dee M-5-
                                             200, Bee Dee M-5-210TC, Bee
                                             Dee M-7-235, Bee Dee M-6-
                                             235, Bee Dee M-4C, Bee Dee
                                             M-5-220C, Bee Dee M-5-235C,
                                             Bee Dee M-6-180, Bee Dee M-
                                             5-210C, Bee Dee MX-7-235,
                                             Bee Dee M-4, MX-7-160C, Bee
                                             Dee M-7 Series, Bee Dee MXT-
                                             7-180, Bee Dee MT-7-235,
                                             Bee Dee M-8-235, Bee Dee MX-
                                             7-160, Bee Dee MXT-7-160,
                                             Bee Dee MX-7-180A, Bee Dee
                                             MXT-7-180A, Bee Dee MX-7-
                                             180B, Bee Dee M-7-235B, Bee
                                             Dee M-6 Series, Bee Dee MX-
                                             7 Series, Bee Dee M-7-235C,
                                             Bee Dee M-4 Series, Bee Dee
                                             M-8 Series, Bee Dee MX-7-
                                             180C, Bee Dee M-7-260C, M-7-
                                             260, MT-7-260, Bee Dee MX-7-
                                             180, and Bee Dee M-7-235A.
                                            Nardi S.A. Model FN-333.
                                            Navion Aircraft Company,
                                             Ltd. Models Navion (L-17A),
                                             Navion A (L-17B), Navion A
                                             (L-17C), Navion B, Navion
                                             D, Navion E, Navion F,
                                             Navion G, and Navion H.
                                            Procaer Progetti Costruzioni
                                             Aeronautiche Models F 15/C,
                                             F 15/B, and F 15/E.
                                            Prop-Jets, Inc. Models 200,
                                             200A, 200B, 200C, and 200D.
                                            REVO, Incorporated Models
                                             Lake LA-4-200, Colonial C-
                                             1, Colonial C-2, Colonial
                                             Lake Model 250, and Lake LA-
                                             4.
                                            Sky International Inc.
                                             Models S-1S, S-2A, S-2, and
                                             S-1T.
                                            SOCATA--Groupe Aerospatiale
                                             Models MS880B, MS885,
                                             MS892A-150, MS892E-150,
                                             MS893A, MS893E, MS894A,
                                             MS894E, TB10, TB20, TB21,
                                             and TB9.
                                            Sud Aviation Models Gardan
                                             GY.80-160, Gardan GY.80-
                                             150, and Gardan GY.80-180.
                                            Swift Museum Foundation,
                                             Inc. Models GC-1A and GC-
                                             1B.
                                            Tiger Aircraft LLC Models AA-
                                             1, AA-1A, AA-1B, AA-1C, AA-
                                             5, AA-5A, and AA-5B.
                                            Univair Aircraft Corporation
                                             Models 415-C, 415-CD, 108-
                                             2, 108-3, and F-1.
                                            Univair Aircraft Corporation
                                             Models F-1A, E, 415D, M10,
                                             A-2-A, and A-2.
                                            Wright, Jr., Elzie Model F-
                                             1.
SE1779NM..................................  Textron Lycoming, AVCO
                                             Corporation Series IGO-540,
                                             IO-320, IGSO-540, O-290,
                                             GSO-580, O-320, IGO-480, GO-
                                             480, GSO-435, O-435, SO-580-
                                             A1A, SO-580-A1B, SO-580, O-
                                             540, VO-540, TIO-541, TIO-
                                             360, TO-360, and LTO-360.
SE1780NM..................................  Curtiss-Wright Corporation
                                             Models A70 and A70-2.
                                            Teledyne Continental Motors
                                             Series TSIO-470, A-65, A-
                                             75, C75, C-125, C-115,
                                             Models A100-1 and A100-2,
                                             Series E-165, E-185, O-200,
                                             C90, C145, O-300, E-225, O-
                                             470, IO-470, Models FSO-
                                             470A, FSO-526A, FSO-526-C,
                                             Series GO-300, Models GSO-
                                             526-A and 6-260-A, Series
                                             IO-360, Models 6-320-B, GIO-
                                             470-A, T6-320-A, IO-346-B,
                                             and IO-346-A, Series IO-
                                             520, GTSIO-520, TSIO-520,
                                             TSIO-360, and LTSIO-360.
--------------------------------------------------------------------------

What is the unsafe condition presented in this AD?

(d) This AD  is the result  of several reports  of failed shuttle  control
    valves of the SVS and one report of an airplane crash with a  fatality
    in which improper use of the  SVS was a factor. The actions  specified
    in  this AD  are intended  to correct  problems with  the  SVS  before
    failure or  malfunction during  instrument flight  rules (IFR)  flight
    that  can lead  to pilot  disorientation and  loss of  control of  the
    aircraft.

What must I do to address this problem?

(e) To address this problem, you must do the following:

------------------------------------------------------------------------
             ACTIONS                  COMPLIANCE          PROCEDURES
------------------------------------------------------------------------
(1) Incorporate the airplane       Within 30 days      Not Applicable.
 flight manual supplement (AFMS)   after the
 in the airplane flight manual     effective date of
 with the appropriate revision     this AD, unless
 in the FAA-approved airplane      already done.
 flight manual (AFM).
(i) The owner/operator holding
 at least a private pilot
 certificate as authorized by
 section 43.7 of the Federal
 Aviation Regulations (14 CFR
 43.7) may do the flight manual
 changes requirement of this AD.
(ii) Make an entry in the
 aircraft records showing
 compliance with this portion of
 the AD following section 43.9
 of the Federal Aviation
 Regulations (14 CFR 43.9).
(2) Install placards described     Before further      Follow the Standby
 in the AFMS.                      flight after        Vacuum System AFM
                                   incorporating the   SUPPLEMENT, dated
                                   AFMS in the FAA-    February 4, 2000.
                                   approved airplane
                                   flight manual
                                   (AFM) required by
                                   paragraph (e)(1)
                                   of this AD.
(3) Upgrade the Model SVS I or     Within 1 year       Follow Precise
 SVS IA SVS to the Model SVS       after the           Flight, Inc.
 VISVS, install the appropriate    effective date of   Installation
 placards, and add the             this AD, unless     Report No. 08080,
 installation report including     already done.       Standby Vacuum
 the instructions for continued                        System Model VI--
 airworthiness (ICA) to the                            Shuttle Valve S/N
 maintenance schedule for the                          10243 &
 aircraft.                                             Subsequent
                                                       (Manual Valve),
                                                       Revision A, dated
                                                       February 21,
                                                       2001.
(4) Do not install any Model SVS   As of the           Not applicable.
 I or SVS IA SVS without also      effective date of
 doing the actions required by     this this AD.
 paragraphs (e)(1), (e)(2) and
 (e)(3) of AD.
--------------------------------------------------------------------------

May I request an alternative method of compliance?

(f) You  may  request a  different method  of  compliance  or a  different
    compliance time  for this  AD by  following the  procedures in  14 CFR
    39.19.  Unless FAA  authorizes otherwise,  send your  request to  your
    principal inspector. The principal inspector may add comments and will
    send  your  request  to the  Manager,  Seattle  Aircraft Certification
    Office (ACO), FAA. For information on any already approved alternative
    methods of compliance, contact  Ms. Marcia Smith, Aerospace  Engineer,
    FAA,  Seattle Aircraft  Certification Office,  1601 Lind  Avenue,  SW,
    Renton, Washington 98055-4065;  telephone: (425) 917-6484;  facsimile:
    (425) 917-6590.

May I get copies of the documents referenced in this AD?

(g) To get copies of the documents referenced in this AD, contact  Precise
    Flight, Inc.,  63120 Powell Butte Road,  Bend Oregon 97701,
    telephone: (800) 547-2558;
    facsimile: (541) 388-1105;
    electronic mail: preciseflight@preciseflight.com;
    Internet: http://www.preciseflight.com/.

To  view  the  AD  docket, go  to  the  Docket  Management Facility;  U.S.
Department of Transportation, 400  Seventh Street, S.W., Nassif  Building,
Room PL-401, Washington, DC, or on the Internet at http://dms.dot.gov. The
docket number is FAA-2004-19354.

Issued in Kansas City, Missouri,  on February 23, 2005. David  R. Showers,
Acting  Manager,  Small   Airplane  Directorate,  Aircraft   Certification
Service.

DATES: We must receive any comments on this proposed AD by April 29, 2005.
PREAMBLE 
DEPARTMENT OF TRANSPORTATION

FEDERAL AVIATION ADMINISTRATION

14 CFR Part 39

[Docket No. FAA-2004-19354; Directorate Identifier 2004-CE-30-AD]
RIN 2120-AA64

AIRWORTHINESS DIRECTIVES;  Precise Flight,  Inc. Models  SVS I  and SVS IA
Standby Vacuum Systems

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

--------------------------------------------------------------------------

SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)  for
all airplanes equipped with  Precise Flight, Inc. (Precise  Flight) Models
SVS I  and SVS  IA standby  vacuum systems  (SVS) installed  under certain
supplemental type certificates or through field approval. This proposed AD
would require you to replace the airplane flight manual supplement  (AFMS)
in the airplane  flight manual with  the appropriate revision  and install
placards as defined in the AFMS, upgrade the Model SVS I or SVS IA SVS  to
the Model  VI SVS,  and add  the instructions  for continued airworthiness
(ICA)  to the  maintenance  schedule  for the  aircraft. This  proposed AD
results  from several  reports of  failed shuttle  control valves  of  the
standby vacuum system  (SVS) and one  report of an  airplane crash with  a
fatality in which  improper use of  the SVS was  a factor. We  are issuing
this  proposed AD  to correct  problems with  the SVS  before  failure  or
malfunction during instrument flight rules  (IFR) flight that can lead  to
pilot disorientation and loss of control of the aircraft.

DATES: We must receive any comments on this proposed AD by April 29, 2005.

ADDRESSES: Use one  of the following  to submit comments  on this proposed
AD:

DOT Docket Web site: Go to http://dms.dot.gov and follow the  instructions
for sending your comments electronically.

Government-wide rulemaking Web site: Go to http://www.regulations.gov  and
follow the instructions for sending your comments electronically.

Mail: Docket Management Facility;  U.S. Department of Transportation,  400
Seventh Street, SW.,  Nassif Building, Room  PL-401, Washington, DC  20590
-001.

Fax: 1-202-493-2251.

Hand Delivery: Room PL-401 on the plaza level of the Nassif Building,  400
Seventh Street,  SW., Washington,  DC, between  9 a.m.  and 5 p.m., Monday
through Friday, except Federal holidays.

To get  the service  information identified  in this  proposed AD, contact
Precise  Flight,  Inc.,  63120  Powell  Butte  Road,  Bend  Oregon  97701,
telephone:  (800) 547-2558;  facsimile: (541)  388-1105; electronic  mail:
preciseflight@preciseflight.com; Internet: http://www.preciseflight.com/

To view the comments to this proposed AD, go to http://dms.dot.gov.

The docket number is FAA-2004-19354.

FOR FURTHER INFORMATION CONTACT:  Ms. Marcia  Smith,  Aerospace  Engineer,
FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton,
Washington  98055-4065; telephone:  (425) 917-6484;  facsimile: (425)  917
-6590.

SUPPLEMENTARY INFORMATION:

COMMENTS INVITED

How do I comment on this proposed AD? We invite you to submit any  written
relevant  data, views,  or arguments  regarding this  proposal. Send  your
comments to an address listed under ADDRESSES. Include the docket  number,
"FAA-2004-19354; Directorate Identifier 2004-CE-30-AD" at the beginning of
your comments. We  will post all  comments we receive,  without change, to
http://dms.dot.gov,  including any  personal information  you provide.  We
will also post a report  summarizing each substantive verbal contact  with
FAA  personnel  concerning  this  proposed  rulemaking.  Using  the search
function of our  docket Web site,  anyone can find  and read the  comments
received into any of our dockets, including the name of the individual who
sent  the comment  (or signed  the comment  on behalf  of an  association,
business, labor union,  etc.). This is  docket number FAA-2004-19354.  You
may  review  the  DOT's  complete Privacy  Act  Statement  in  the Federal
Register published on  April 11, 2000  (65 FR 19477-78)  or you may  visit
http://dms.dot.gov.

Are there any specific portions of this proposed AD I should pay attention
to? We specifically invite  comments on the overall  regulatory, economic,
environmental, and energy aspects of  this proposed AD. If you  contact us
through  a  nonwritten  communication  and  that  contact  relates  to   a
substantive part of  this proposed AD,  we will summarize  the contact and
place the summary in the docket. We will consider all comments received by
the closing date and may amend this proposed AD in light of those comments
and contacts.

DOCKET INFORMATION

Where can I go to view the docket information? You may view the AD  docket
that  contains  the  proposal,  any  comments  received,  and  any   final
disposition in person at the DMS Docket Offices between 9 a.m. and 5  p.m.
(eastern standard time), Monday  through Friday, except Federal  holidays.
The Docket Office (telephone 1-800-647-5227) is located on the plaza level
of the Department of Transportation NASSIF Building at the street  address
stated in ADDRESSES. You  may also view the  AD docket on the  Internet at
http://dms.dot.gov.  The  comments  will be  available  in  the AD  docket
shortly after the DMS receives them.

DISCUSSION

What events  have caused  this proposed  AD? The  FAA has received several
reports  of problems  on aircraft  equipped with  a Precise  Flight,  Inc.
standby vacuum system (SVS). In particular, the reports show 14  incidents
of failed shuttle control valves and one report of an airplane crash  with
a fatality where improper  use of the SVS  was a factor that  caused us to
issue AD 99-24-10, Amendment 39-11434 (64 FR 66747, November 30, 1999). AD
99-24-10 currently requires  the following on  all aircraft equipped  with
Precise Flight, Inc. Model SVS III standby vacuum systems installed  under
the  applicable  supplemental  type  certificate  (STC)  or  through field
approval:

--Incorporate revised operating limitations for the affected SVS into  the
  airplane flight manual (AFM);

--Inspect  (repetitively)  the  push-pull  cable,  vacuum  lines,   saddle
  fittings,  and   shuttle  valve  for  correct  installation  and  damage
  (wear, chafing, deterioration, and so forth); and

--Correct any discrepancy found and conduct a function test of the  vacuum
  system after the inspections.

The  SVS  is  intended  to provide  emergency  vacuum  power  for aircraft
instruments  when  the primary  vacuum  system fails.  The  design of  the
Precise Flight, Inc. Models SVS I and  SVS IA SVS is similar to the  Model
SVS III SVS, and so it may not be able to provide sufficient vacuum  power
to  correctly measure  altitude and  operate the  vacuum instruments.  The
upgrade of the  Models SVS I  or IA SVS  to the Model  SVS VI SVS provides
sufficient  vacuum power  to correctly  measure altitude  and operate  the
vacuum instruments.

Failure of the SVS in instrument flight rules (IFR) can lead to the  pilot
making incorrect decisions based on the data received from the instruments
with consequent loss of control of the aircraft.

The Precise  Flight, Inc.  Models SVS  I and  SVS IA  SVS are installed on
aircraft through a  supplemental type certificate  (STC) or through  field
approval.  The  Applicability  section  of  the  proposed  AD  lists   the
applicable STCs  and aircraft  that could  have these  SVS installed. This
list is not meant to be  exhaustive nor does it include all  aircraft with
the systems installed through field approval.

What is the potential impact if FAA took no action? Failure or malfunction
of the SVS during IFR flight can lead to pilot disorientation and loss  of
control of the aircraft.

Is there service information that applies to this subject? Precise Flight,
Inc. has issued Installation Report No. 08080, Standby Vacuum System Model
VI--Shuttle Valve S/N 10243 & Subsequent (Manual Valve), Revision A, dated
February 21, 2001.  This report provides  instructions for the  upgrade of
the  Models  SVS I  or  SVS IA  SVS  to the  Model  VI SVS;  and  includes
procedures for upgrading to the Model SVS VI SVS.

FAA'S DETERMINATION AND REQUIREMENTS OF THIS PROPOSED AD

What has  FAA decided?  We have  evaluated all  pertinent information  and
identified an unsafe condition that is likely to exist or develop on other
products of this same  type design. For this  reason, we are proposing  AD
action.

What would this proposed AD require? This proposed AD would require you to
replace  the  airplane flight  manual  supplement (AFMS)  in  the airplane
flight  manual  with  the appropriate  revision  and  install placards  as
defined in the AFMS, upgrade the Model SVS I or SVS IA SVS to the Model VI
SVS, and  add the  instructions for  continued airworthiness  (ICA) to the
maintenance schedule for the aircraft.

How does the revision to 14 CFR  part 39 affect this proposed AD? On  July
10, 2002, we published a new version of 14 CFR part 39 (67 FR 47997,  July
22, 2002),  which governs  FAA's AD  system. This  regulation now includes
material that  relates to  altered products,  special flight  permits, and
alternative methods of compliance.  This material previously was  included
in each individual AD. Since this material is included in 14 CFR part  39,
we will not include it in future AD actions.

COSTS OF COMPLIANCE

How many airplanes  would this proposed  AD impact? We  estimate that this
proposed AD affects 800 airplanes in the U.S. registry.

What would be the cost impact  of this proposed AD on owners/operators  of
the affected  airplanes? We  estimate the  following costs  to replace the
airplane flight  manual supplement  (AFMS) in  the airplane  flight manual
with the appropriate revision. We have no way of determining the number of
airplanes that may need this replacement:

--------------------------------------------------------------------------
                                                      TOTAL COST PER
         LABOR COST                PARTS COST            AIRPLANE
--------------------------------------------------------------------------
1 work hour x $65 = $65               None                  $65
------------------------------------------------------------------------

We estimate the following costs to do any upgrade to the Model SVS VI SVS,
install  placards,   and  add   the  installation   report  including  the
instructions for continued airworthiness (ICA) to the maintenance schedule
for the aircraft. We  have no way of  determining the number of  airplanes
that may need this upgrade:

--------------------------------------------------------------------------
                                                      TOTAL COST PER
         LABOR COST                PARTS COST            AIRPLANE
--------------------------------------------------------------------------
3 work hour x $65 = $195              $77                  $272
--------------------------------------------------------------------------

REGULATORY FINDINGS

Would this proposed  AD impact various  entities? We have  determined that
this proposed AD  would not have  federalism implications under  Executive
Order 13132. This proposed AD  would not have a substantial  direct effect
on the States, on the relationship between the national Government and the
States, or  on the  distribution of  power and  responsibilities among the
various levels of government.

Would this proposed  AD involve a  significant rule or  regulatory action?
For the reasons discussed above, I certify that this proposed AD:

1. Is not a "significant regulatory action" under Executive Order 12866;

2. Is  not  a "significant  rule" under  the DOT  Regulatory Policies  and
   Procedures (44 FR 11034, February 26, 1979); and

3. Will not have a significant economic impact, positive or negative, on a
   substantial  number  of  small  entities  under  the  criteria  of  the
   Regulatory Flexibility Act.

We prepared a  summary of the  costs to comply  with this proposed  AD and
placed it in the AD Docket. You may get a copy of this summary by  sending
a request to us at the address listed under ADDRESSES. Include "AD  Docket
FAA-2004-19354; Directorate Identifier 2004-CE-30-AD" in your request.

LIST OF SUBJECTS IN 14 CFR PART 39

Air transportation, Aircraft, Aviation safety, Safety.

THE PROPOSED AMENDMENT

Accordingly, under the authority delegated to me by the Administrator, the
Federal  Aviation  Administration proposes  to  amend 14  CFR  part 39  as
follows:

PART 39--AIRWORTHINESS DIRECTIVES

1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.

SEC. 39.13 [AMENDED]

2. The FAA  amends Sec.  39.13  by adding the  following new airworthiness
directive (AD):