DEPARTMENT OF TRANSPORTATION

FEDERAL AVIATION ADMINISTRATION

14 CFR Part 39

[Docket No. FAA-2007-28245; Directorate Identifier 2007-CE-047-AD]
RIN 2120-AA64

AIRWORTHINESS DIRECTIVES; Cirrus Design Corporation Models SR20
and SR22 Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Supplemental notice of proposed rulemaking (NPRM); Reopening of
the comment period.

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SUMMARY: We are revising an earlier proposed airworthiness directive  (AD)
that applies to  certain Cirrus Design  Corporation (CDC) Models  SR20 and
SR22 airplanes. The  earlier NPRM would  have required you  to replace the
cabin door rod ends at the upper  and lower hinges of the cabin door  with
newly  designed  rod  ends.  The  earlier  NPRM  resulted  from  two known
occurrences of in-flight cabin  door separation (one total  separation and
one retained by  the door strut).  This proposed AD  would require you  to
replace the cabin door rod ends with new parts including a redesigned  non
-binding hinge pin that replaces the existing pin at the upper door hinge.
Since these actions impose an additional burden over that proposed in  the
NPRM, we are reopening the comment  period to allow the public the  chance
to comment on these additional actions.

DATES: We must receive comments on this proposed AD by June 2, 2008.

ADDRESSES: Use one of the following addresses to comment on this  proposed
AD:

Federal eRulemaking Portal: Go to http:// www.regulations.gov. Follow  the
instructions for submitting comments.

Fax: (202) 493-2251.

Mail: U.S.  Department of  Transportation, Docket  Operations, M-30,  West
Building  Ground  Floor,  Room  W12-140,  1200  New  Jersey  Avenue,  SE.,
Washington, DC 20590.

Hand Delivery: U.S. Department of Transportation, Docket Operations, M-30,
West Building  Ground Floor,  Room W12-140,  1200 New  Jersey Avenue, SE.,
Washington, DC 20590,  between 9 a.m.  and 5 p.m.,  Monday through Friday,
except Federal holidays.

For service  information identified  in this  proposed AD,  contact Cirrus
Design  Corporation,   4515  Taylor   Circle,  Duluth,   Minnesota  55811;
telephone: (218) 727-2737; Internet address: http:// www.cirrusdesign.com.

FOR FURTHER INFORMATION CONTACT:  Wess Rouse, Aerospace Engineer,  Chicago
Aircraft  Certification  Office, 2300  East  Devon Avenue,  Room  107, Des
Plaines, Illinois 60018; telephone: (847) 294-8113; fax: (847) 294-7834.

SUPPLEMENTARY INFORMATION:

COMMENTS INVITED

We  invite you  to send  any written  relevant data,  views, or  arguments
regarding this proposed AD. Send your comments to an address listed  under
the  ADDRESSES   section.  Include  the  docket  number,  "FAA-2007-28245;
Directorate Identifier 2007-CE-047-AD" at the beginning of your  comments.
We  specifically  invite  comments on  the  overall  regulatory, economic,
environmental, and energy aspects of the proposed AD. We will consider all
comments received by  the closing date  and may amend  the proposed AD  in
light of those comments.

We  will  post  all  comments  we  receive,  without  change,  to  http://
www.regulations.gov, including  any personal  information you  provide. We
will also  post a  report summarizing  each substantive  verbal contact we
receive concerning this proposed AD.

DISCUSSION

On June  6, 2007,  we issued  a proposal  to amend  part 39 of the Federal
Aviation Regulations (14 CFR part 39) to include an AD that would apply to
certain CDC Models SR20 and SR22 airplanes. This proposal was published in
the Federal Register as a notice of proposed rulemaking (NPRM) on June 13,
2007 (72 FR 32563). The NPRM proposed to require you to replace the  cabin
door rod ends at the upper and  lower hinges of the cabin door with  newly
designed rod ends.

COMMENTS

We provided the public the  opportunity to participate in developing  this
AD. The following presents the comment received on the proposal and  FAA's
response to the comment:

COMMENT ISSUE: REVISED SERVICE BULLETIN

We received a comment from CDC stating that CDC will soon release  Service
Bulletin (SB)  SB 2X-52-07  R2 listed  in the  NPRM and  requested the  AD
require accomplishment of that version.

The FAA  partially agrees.  The latest  revision to  the service  bulletin
should  be used  for AD  accomplishment; however,  SB 2X-52-07  R2 had  an
incorrectly written compliance paragraph that required  SB 2X-52-07 R3. SB
2X-52-07  R3 was  issued on  September 24,  2007, but  because of  further
changes necessary to insure proper  door operation without binding, SB  2X
-52-07 R4 was issued on January  24, 2008. We will change the  proposed AD
to require following  the procedures in  Service Bulletin SB  2X-52-07 R4,
dated January 24, 2008.

FAA'S DETERMINATION AND REQUIREMENTS OF THIS PROPOSED AD

We have  carefully reviewed  the available  data and  determined that  the
unsafe condition referenced  in this document  exists or could  develop on
other products of the  same type design; and  we should take AD  action to
correct this unsafe condition.

Certain changes described above expand the scope of the earlier NPRM. As a
result, we  have determined  that it  is necessary  to reopen  the comment
period to provide additional opportunity for the public to comment on  the
proposed AD.

THE SUPPLEMENTAL NPRM

Since we issued the earlier NPRM, CDC issued Service Bulletin SB  2X-52-07
R4, dated January 24, 2008,  which includes changes to assure  proper door
operation without binding.

Proposing  new parts  including a  redesigned non-binding  hinge pin  that
replaces the existing bolt at the  upper door hinge and a castellated  nut
for the upper end of the hinge pin to improve security of attaching  parts
goes  beyond  the scope  of  what was  originally  proposed in  the  NPRM.
Therefore, we are reopening the comment period and allowing the public the
chance to comment on these additional actions.

COSTS OF COMPLIANCE

We  estimate that  the proposed  AD affects  2,308 airplanes  in the  U.S.
registry.

The costs vary  from 3.5 work-hours  to  incorporate Cirrus  Kit 70186-004
and 2.5  work-hours to  incorporate Cirrus  Kit 70186-005.  Parts cost for
either kit is $270. For the purposes  of the proposed AD, we will use  3.5
work-hours for all airplanes. Based on  this, the cost of the proposed  AD
is:

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                                                   TOTAL COST   TOTAL FLEET
LABOR COST                            PARTS COST  PER AIRPLANE      COST
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3.5 work-hours x $80 per hour = $280     $270         $550       $1,269,400
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NOTE: CDC will provide warranty credit to the extent noted in CDC  Service
Bulletin 2X-52-07 R4, dated January 24, 2008.

AUTHORITY FOR THIS RULEMAKING

Title 49 of the United States Code specifies the FAA's authority to  issue
rules on aviation safety. Subtitle I, Section 106, describes the authority
of the FAA  Administrator. Subtitle VII,  Aviation Programs, describes  in
more detail the scope of the Agency's authority.

We are issuing this rulemaking  under the authority described in  Subtitle
VII, Part  A, Subpart  III, Section  44701, "General  requirements." Under
that section, Congress charges the FAA with promoting safe flight of civil
aircraft  in  air  commerce  by  prescribing  regulations  for  practices,
methods, and procedures  the Administrator finds  necessary for safety  in
air  commerce.  This regulation  is  within the  scope  of that  authority
because  it addresses  an unsafe  condition  that  is likely  to exist  or
develop on products identified in this rulemaking action.

REGULATORY FINDINGS

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.

For the reasons discussed above, I certify that the proposed regulation:

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 regulatory evaluation of the estimated costs to comply  with
this proposed AD and placed it in the AD docket.

EXAMINING THE AD DOCKET

You  may  examine  the  AD  docket  that  contains  the  proposed  AD, the
regulatory evaluation, any comments received, and other information on the
Internet  at http://dms.dot.gov;  or in  person at  the Docket  Management
Facility between 9 a.m. and 5 p.m., Monday through Friday, except  Federal
holidays. The Docket Office (telephone  (800) 647-5527) is located at  the
street address stated in the ADDRESSES section. Comments will be available
in the AD docket shortly after receipt.

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
FAA 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 AD: