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2024-05-04	GULFSTREAM AEROSPACE CORPORATION: Amendment 39-22695; Docket No. FAA-2023-1805; Project Identifier AD-2023-00019-T.

(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective May 2, 2024.

(b) AFFECTED ADS

    This  AD  replaces AD  2020-23-04,  Amendment 39-21320  (85  FR 71232,
    November 9, 2020) (AD 2020-23-04).

(c) APPLICABILITY

    This AD  applies to  the Gulfstream  Aerospace Corporation  airplanes,
    certificated in any category, identified in paragraphs (c)(1) and  (2)
    of this AD.

(1) Model GVII-G500 airplanes, serial numbers (S/Ns) 72001 and subsequent.

(2) Model GVII-G600 airplanes, S/Ns 73001 and subsequent.

(d) SUBJECT

    Air Transport Association (ATA) of America Code 2822, Fuel Boost Pump.

(e) UNSAFE CONDITION

    This AD was  prompted by a  report of misassembled  impellers onto the
    shaft of  the fuel  boost pump  during production.  The FAA is issuing
    this AD to prevent the ignition  of flammable vapors in the fuel  tank
    as  a result  of frictional  heating or  sparks caused  by a  missing,
    misplaced, or dislodged impeller shaft key inside the fuel boost pump.
    The unsafe condition,  if not addressed,  could result in  a potential
    source of ignition in the fuel tank and  consequent fire or explosion.

(f) COMPLIANCE

    Comply  with this  AD within  the compliance  times specified,  unless
    already done.

(g) RETAINED MANUAL UPDATES, WITH UPDATED SERVICE INFORMATION

    This paragraph restates the requirements  of paragraph (g) of AD  2020
    -23-04, with updated service information. For Model GVII-G500 airplane
    S/Ns  72001 and  72007 through  72062 inclusive;  and Model  GVII-G600
    airplane S/Ns 73002, 73004, 73006 through 73040 inclusive, 73042,  and
    73043: Within 14 days after  November 24, 2020 (the effective  date of
    AD 2020-23-04),  do the  actions in  paragraphs (g)(1)  through (3) of
    this AD, as applicable.

(1) Revise your  existing airplane maintenance  manual (AMM) by  replacing
    the procedures listed in paragraphs (g)(1)(i) through (vi) of this AD,
    as applicable for your model airplane.

(i) GVII-G500  Maintenance  Manual  12-13-01  Defueling  Procedure-Defuel,
    dated August 31, 2020;  or 12-13-01 Defueling Procedure-Defuel,  12-13
    Fueling and Defueling Operations Replenishing, Chapter  12--Servicing,
    Gulfstream Aerospace GVII-G500  Aircraft Maintenance Manual,  Document
    Number  GAC-AC-GVII-G500-AMM-0001,  Revision  16,  dated  November 30,
    2023.

(ii) GVII-G500  Maintenance Manual 28-26-04  Fuel Boost  Pump-Prime, dated
     August 31, 2020; or 28-26-04 Fuel Boost Pump-Prime, 28-26 Engine  and
     APU Fuel Delivery,  Chapter 28--Fuel, Gulfstream  Aerospace GVII-G500
     Aircraft  Maintenance  Manual,  Document  Number GAC-AC-GVII-G500-AMM
     -0001, Revision 16, dated November 30, 2023.

(iii) GVII-G600  Maintenance  Manual 12-13-01 Defueling  Procedure-Defuel,
      dated August 31, 2020; or 12-13-01 Defueling Procedure-Defuel, 12-13
      Fueling   and   Defueling  Operations   Replenishing,   Chapter  12-
      -Servicing,  Gulfstream  Aerospace  GVII-G600  Aircraft  Maintenance
      Manual,  Document  Number  GAC-AC-GVII-G600-AMM-0001,  Revision  12,
      dated November 30, 2023.

(iv) GVII-G600  Maintenance Manual  28-26-04 Fuel  Boost Pump-Prime, dated
     August 31, 2020.

(v) GVII-G600 Maintenance Manual 28-26-04 Fuel Boost Pump-Removal/Install-
    ation,  dated   August  31,   2020;  or   28-26-04  Fuel   Boost  Pump
    -Removal/Installation, 28-26 Engine and APU Fuel Delivery, Chapter  28
    --Fuel, Gulfstream  Aerospace GVII-G600  Aircraft Maintenance  Manual,
    Document Number GAC-AC-GVII-G600-AMM-0001, Revision 12, dated November
    30, 2023.

(vi) GVII-G600  Maintenance  Manual  28-26-05  Fuel  Boost  Pump Canister-
     Removal/Installation, dated August 31, 2020.

(2) Revise your existing airplane flight manual (AFM) by including in  the
    AFM the airplane flight  manual supplement (AFMS) listed  in paragraph
    (g)(2)(i), (ii), or (iii) of this AD that is applicable to your  model
    airplane. Using  a later  AFM revision  with information  identical to
    that contained in the AFMS  specified for your airplane is  acceptable
    for compliance with the requirement of this paragraph.

(i) Gulfstream Aerospace GVII-G500  Airplane Flight Manual Supplement  No.
    GVII-G500 (Issue 1)--2020-05, dated September 8, 2020; or

(ii) Gulfstream Aerospace GVII-G500 Airplane Flight Manual Supplement  No.
     GVII-G500-2020-06, dated September 8, 2020; or

(iii) Gulfstream Aerospace GVII-G600 Airplane Flight Manual Supplement No.
      GVII-G600-2020-06, dated September 8, 2020.

(3) The action required by paragraph (g)(2) of this AD may be performed by
    the  owner/operator   (pilot)  holding   at  least   a  private  pilot
    certificate  and must  be entered  into the  aircraft records  showing
    compliance with this AD in  accordance with 14 CFR 43.9(a)(1)  through
    (4), and  14 CFR  91.417(a)(2)(v). The  record must  be maintained  as
    required by 14 CFR 91.417, 121.380, or 135.439.

(h) NEW REQUIREMENTS

    For  Model  GVII-G500  airplane S/Ns  72001  and  72007 through  72062
    inclusive;  and  Model  GVII-G600 airplane  S/Ns  73002,  73004, 73006
    through  73040 inclusive,  73042, and  73043: Except  as specified  in
    paragraph (i) of this AD, within 24 months after the effective date of
    this  AD,  do  all  actions  specified  in  paragraph  III.D.  and all
    applicable actions  identified as  "RC" (required  for compliance) in,
    and in accordance with, the Accomplishment Instructions of  Gulfstream
    GVII-G500 Customer Bulletin No.  069 or Gulfstream GVII-G600  Customer
    Bulletin No.  037, both  Revision A,  both dated  February 2, 2023, as
    applicable.

NOTE 1 TO PARAGRAPH (h): The serial number on the aft exterior of the pump
is not the pump serial number.

NOTE 2  TO  PARAGRAPH  (h): Guidance  on  pump  removal  and  installation
procedures  can  be  found in  Gulfstream  Aerospace  GVII- G500  Aircraft
Maintenance Manual, Document  Number GAC-AC-GVII-G500- AMM-0001,  Revision
12,  dated  June 15,  2022;  and Gulfstream  Aerospace  GVII-G600 Aircraft
Maintenance Manual, Document  Number GAC-AC-GVII- G600-AMM-0001,  Revision
8, dated June 15, 2022.

(i) SERVICE INFORMATION EXCEPTION

    Where Gulfstream  GVII-G500 Customer  Bulletin No.  069 and Gulfstream
    GVII-G600  Customer  Bulletin No.  037,  both Revision  A,  both dated
    February  2, 2023,  specify to  return any  pump for  repair, this  AD
    requires replacing the pump in accordance with the applicable  service
    information identified in paragraph (h) of this AD.

(j) TERMINATING ACTION FOR PARAGRAPH (G) OF THIS AD

    The requirements  of paragraph  (g) of  this AD  are terminated if all
    applicable actions  required by  paragraph (h)  of this  AD have  been
    accomplished.

(k) PARTS INSTALLATION LIMITATION

    As of  the effective  date of  the AD,  no person  may install  on any
    airplane a fuel boost pump  having a part and serial  number specified
    in  Table  1 of  Gulfstream  GVII-G500 Customer  Bulletin  No. 069  or
    Gulfstream GVII-G600 Customer Bulletin No. 037, both Revision A,  both
    dated February 2, 2023, as applicable, unless that pump is marked with
    the letter  "C" to  the right  of the  "INSP" legend  on the pump data
    area.

(l) CREDIT FOR PREVIOUS ACTIONS

    This paragraph provides credit for the actions specified in  paragraph
    (h) of this AD, if  those actions were performed before  the effective
    date of this AD using the service information identified in paragraphs
    (l)(1) and (2) of this AD, as applicable. This service information  is
    not incorporated by reference in this AD.

(1)  Gulfstream GVII-G500  Customer Bulletin  No. 069,  dated October  19,
    2022.

(2) Gulfstream  GVII-G600  Customer Bulletin  No. 037,  dated October  19,
    2022.

(m) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) The  Manager, East  Certification Branch,  FAA, has  the authority  to
    approve AMOCs for this AD, if requested using the procedures found  in
    14 CFR 39.19. In  accordance with 14 CFR  39.19, send your request  to
    your principal  inspector or  responsible Flight  Standards Office, as
    appropriate. If  sending information  directly to  the manager  of the
    certification  office,  send  it  to  the  attention  of  the   person
    identified in paragraph (n)(1) of this AD.

(2) Before  using  any approved  AMOC, notify  your appropriate  principal
    inspector,  or  lacking  a principal  inspector,  the  manager of  the
    responsible Flight Standards Office.

(3) AMOCs  approved  for  AD  2020-23-04 are  approved  as AMOCs  for  the
    corresponding provisions of this AD.

(4) For  service  information  that  contains steps  that  are labeled  as
    Required for Compliance (RC),  the provisions of paragraphs  (m)(4)(i)
    and (ii) of this AD apply.

(i) The steps labeled as RC,  including substeps under an RC step  and any
    figures identified in an RC step, must be done to comply with the  AD.
    An AMOC is required for any deviations to RC steps, including substeps
    and identified figures.

(ii) Steps not labeled as RC  may be deviated from using accepted  methods
     in accordance with the  operator's maintenance or inspection  program
     without  obtaining  approval  of  an  AMOC,  provided  the  RC steps,
     including  substeps  and identified  figures,  can still  be  done as
     specified,  and  the  airplane  can  be  put  back  in  an  airworthy
     condition.

(n) RELATED INFORMATION

(1) For  more information  about this  AD, contact  Jared Meyer,  Aviation
    Safety Engineer, FAA,  1701 Columbia Avenue,  College Park, GA  30337;
    phone: 404-474-5534; email: 9-ASO-ATLACO-ADs@faa.gov.

(2) Service information identified in this AD that is not incorporated  by
    reference is available at the address specified in paragraph (o)(5) of
    this AD.

(o) MATERIAL INCORPORATED BY REFERENCE

(1) The  Director of  the Federal  Register approved  the incorporation by
    reference (IBR) of  the service information  listed in this  paragraph
    under 5 U.S.C. 552(a) and 1 CFR part 51.

(2) You must use this service information as applicable to do the  actions
    required by this AD, unless this AD specifies otherwise.

(3) The following service information was approved for IBR on May 2, 2024.

(i) Gulfstream  GVII-G500  Customer Bulletin  No. 069,  Revision A,  dated
    February 2, 2023.

(ii) Gulfstream  GVII-G600 Customer  Bulletin No.  037, Revision  A, dated
     February 2, 2023.

(iii) 12-13-01  Defueling  Procedure-Defuel, 12-13  Fueling and  Defueling
      Operations Replenishing, Chapter 12--Servicing, Gulfstream Aerospace
      GVII-G500 Aircraft Maintenance  Manual, Document Number GAC-AC-GVII-
      G500-AMM-0001, Revision 16, dated November 30, 2023.

NOTE 3 TO PARAGRAPH (o)(3)(iii): The manufacturer name is located only  on
the title page of the  documents identified in paragraphs (o)(3)(iii)  and
(iv) of this AD.

(iv)12-13-01  Defueling  Procedure-Defuel,  12-13  Fueling  and  Defueling
    Operations Replenishing,  Chapter 12--Servicing,  Gulfstream Aerospace
    GVII-G600  Aircraft  Maintenance Manual,  Document  Number GAC-AC-GVII
    -G600-AMM-0001, Revision 12, dated November 30, 2023.

(v) 28-26-04 Fuel  Boost Pump-Prime, 28-26  Engine and APU  Fuel Delivery,
    Chapter 28--Fuel, Gulfstream Aerospace GVII-G500 Aircraft  Maintenance
    Manual, Document Number GAC-AC-GVII-G500-AMM-0001, Revision 16,  dated
    November 30, 2023.

NOTE 4 TO PARAGRAPH (o)(3)(v): The  manufacturer name is  located  only on
the title  page of  the documents  identified in  paragraphs (o)(3)(v) and
(vi) of this AD.

(vi) 28-26-04 Fuel Boost  Pump-Removal/Installation, 28-26 Engine and  APU
     Fuel Delivery, Chapter 28--Fuel, Gulfstream Aerospace  GVII-G600 Air-
     craft  Maintenance Manual, Document Number GAC-AC-GVII-G600-AMM-0001,
     Revision 12, dated November 30, 2023.

(4) The following service information was approved for IBR on November 24,
    2020 (85 FR 71232, November 9, 2020).

(i) Gulfstream Aerospace GVII-G500  Airplane Flight Manual Supplement  No.
    GVII-G500 (Issue 1)--2020-05, dated September 8, 2020.

(ii) Gulfstream Aerospace GVII-G500 Airplane Flight Manual Supplement  No.
     GVII-G500-2020-06, dated September 8, 2020.

(iii) Gulfstream Aerospace GVII-G600 Airplane Flight Manual Supplement No.
      GVII-G600-2020-06 dated September 8, 2020.

(iv) GVII-G500  Maintenance  Manual  12-13-01 Defueling  Procedure-Defuel,
     dated August 31, 2020.

NOTE  5  TO PARAGRAPH  (o)(4)(iv):  Although the  documents  in paragraphs
(o)(4)(iv) through (ix) have the watermarked words "advance copy" on  each
page  of  the document,  these  are not  advance  draft copies  but  final
versions of temporary revisions to the AMM, pending incorporation into the
AMM at the next revision.

(v) GVII-G500  Maintenance Manual  28-26-04 Fuel  Boost Pump-Prime,  dated
    August 31, 2020.

(vi) GVII-G600  Maintenance  Manual  12-13-01  Defueling Procedure-Defuel,
     dated August 31, 2020.

(vii) GVII-G600 Maintenance Manual  28-26-04 Fuel  Boost Pump-Prime, dated
      August 31, 2020.

(viii) GVII-G600  Maintenance Manual  28-26-04  Fuel  Boost  Pump-Removal/
       Installation, dated August 31, 2020.

(ix) GVII-G600 Maintenance Manual 28-26-05 Fuel Boost Pump Canister-Remov-
     al/Installation, dated August 31, 2020.

(5) For  service  information identified  in this  AD, contact  Gulfstream
    Aerospace Corporation,  Technical Publications  Dept., P.O.  Box 2206,
    Savannah,    GA    31402-2206;    telephone    800-810-4853;     email
    pubs@gulfstream.com; website gulfstream.com/en/customer-support.

(6) You may view this  service  information at the FAA, Airworthiness Pro-
    ducts Section, Operational  Safety Branch, 2200  South 216th St.,  Des
    Moines, WA. For  information on the  availability of this  material at
    the FAA, call 206-231-3195.

(7) You may view this material at the National Archives and Records Admin-
    istration (NARA). For information on the availability of this material
    at NARA, visit  www.archives.gov/federal-register/cfr/ibr-locations or
    email fr.inspection@nara.gov.

Issued on March 21, 2024.  Victor Wicklund, Deputy Director, Compliance  &
Airworthiness Division, Aircraft Certification Service.

FOR FURTHER  INFORMATION CONTACT:  Jared Meyer,  Aviation Safety Engineer,
FAA, 1701 Columbia  Avenue, College Park,  GA 30337; phone:  404-474-5534;
email: 9-ASO-ATLACO-ADs@faa.gov.

PREAMBLE

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2023-1805; Project Identifier AD-2023-00019-T;
Amendment 39-22695; AD 2024-05-04]
RIN 2120-AA64

Airworthiness Directives; Gulfstream Aerospace Corporation Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2020-23-
04, which applied to certain Gulfstream Aerospace Corporation Model
GVII-G500 and GVII-G600 airplanes. AD 2020-23-04 required revising the
existing airplane flight manual (AFM) and airplane maintenance manual
(AMM) to include information pertaining to the fuel boost pump. This AD
was prompted by a report of misassembled impellers on the shaft of the
fuel boost pump during production. This AD retains the requirements of
AD 2020-23-04 and requires inspecting affected fuel boost pumps for
proper installation of the impeller shaft key, marking affected fuel
boost pumps that pass that inspection, and replacing fuel boost pumps
that fail. This AD also limits the installation of affected fuel boost
pumps. The FAA is issuing this AD to address the unsafe condition on
these products.

DATES: This AD is effective May 2, 2024.

The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of May 2, 2024.

The Director of the Federal Register approved the incorporation by
reference of certain other publications listed in this AD as of
November 24, 2020 (85 FR 71232, November 9, 2020).

ADDRESSES:

AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2023-1805; or in person at Docket Operations between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD
docket contains this final rule, any comments received, and other
information. The address for Docket Operations is U.S. Department of
Transportation, Docket Operations, M-30, West Building Ground Floor,
Room W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590.

Material Incorporated by Reference:

For service information identified in this final rule,
contact Gulfstream Aerospace Corporation, Technical Publications Dept.,
P.O. Box 2206, Savannah, GA 31402-2206; telephone 800-810-4853; email
pubs@gulfstream.com; website gulfstream.com/en/customer-support.

You may view this service information at the FAA,
Airworthiness Products Section, Operational Safety Branch, 2200 South
216th St., Des Moines, WA. For information on the availability of this
material at the FAA, call 206-231-3195. It is also available at
regulations.gov under Docket No. FAA-2023-1805.

FOR FURTHER INFORMATION CONTACT: Jared Meyer, Aviation Safety Engineer,
FAA, 1701 Columbia Avenue, College Park, GA 30337; phone: 404-474-5534;
email: 9-ASO-ATLACO-ADs@faa.gov.

SUPPLEMENTARY INFORMATION:

Background

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 to supersede AD 2020-23-04, Amendment 39-21320 (85 FR
71232, November 9, 2020) (AD 2020-23-04). AD 2020-23-04 applied to
certain Gulfstream Aerospace Corporation Model GVII-G500 and GVII-G600
airplanes. The NPRM published in the Federal Register on September 5,
2023 (88 FR 60606). The NPRM was prompted by a report of misassembled
impellers on the shaft of the fuel boost pump during production. In the
NPRM, the FAA proposed to continue to require revising the existing AFM
and AMM to include information pertaining to the fuel boost pump. The
NPRM also proposed to require inspecting affected fuel boost pumps for
proper installation of the impeller shaft key, marking affected fuel
boost pumps that pass that inspection, and replacing fuel boost pumps
that fail. The NPRM also proposed to limit installation of affected
fuel boost pumps. The FAA is issuing this AD to prevent the ignition of
flammable vapors in the fuel tank as a result of frictional heating or
sparks caused by a missing, misplaced, or dislodged impeller shaft key
inside the fuel boost pump. The unsafe condition, if not addressed,
could result in a potential source of ignition in the fuel tank and
consequent fire or explosion.

Discussion of Final Airworthiness Directive

Comments

The FAA received a comment from an anonymous commenter who
supported the NPRM without change.

The FAA received additional comments from Gulfstream Aerospace
Corporation (Gulfstream). The following
presents the comments received on the NPRM and the FAA's response to
each comment.

Request To Change the Maintenance Manual Version

Gulfstream requested that the FAA change the maintenance manual
revision dates specified in paragraph (g) of the proposed AD to refer
to subsequent dates. Gulfstream stated that GVII-G600 Maintenance
Manual 28-26-04 Fuel Boost Pump-Removal/Installation Procedure, dated
August 31, 2020, was revised March 31, 2023, to include non-technical
changes (including the use of puller tool to reduce risk of damage to
Fuel Boost Pump (FBP) during removal with a caution note to avoid
excess force when removing FBP and a step to record FBP serial number
to determine serviceability). Gulfstream also stated that GVII-G500
Maintenance Manual 12-13-01 Defueling Procedure-Defuel, dated August
31, 2020, and GVII-G600 Maintenance Manual 12-13-01 Defueling
Procedure-Defuel, dated August 31, 2020, were revised on September 30,
2023, due to an administrative error.

The FAA agrees with the request. The revised defueling procedure
requested by Gulfstream is acceptable because it instructs fuel boost
pump maintenance to be performed in a way that addresses the unsafe
condition and it prevents damage to the parts being removed/installed.
The FAA has revised paragraphs (g)(1)(i), (ii), (iii), and (v) of this
AD accordingly.

Request To Change Paragraph (i) of the Proposed AD

Gulfstream requested that the compliance time in paragraph (i) of
the proposed AD be revised from "replacing the pump before further
flight" to "replacing the pump following the completion of the CB
[customer bulletin] before further flight." Gulfstream reported the
statement "this AD requires replacing the pump before further flight
in accordance with the requirements of paragraph (h) of this AD" in
paragraph (i) of the proposed AD could be misleading. Gulfstream stated
it believes this statement could be misunderstood by operators to mean
that the AD immediately grounds their aircraft.

The FAA agrees with the commenter that paragraph (i) of this AD
should be revised to clarify the intent of this AD. Operators have 24
months to comply with all applicable actions required by paragraph (h)
of this AD. The FAA has revised paragraph (i) of this AD by removing
the reference to "before further flight" and specifying that where
the service information says to return a pump, this AD requires that
the pump must be replaced.

Request for Removing GVII-G500 AFM

Gulfstream requested removing reference to "Gulfstream Aerospace
GVII-G500 Airplane Flight Manual Supplement No. GVII-G500-2020-06,
dated September 8, 2020," from paragraph (g)(2)(ii) of the proposed
AD; Gulfstream stated there are no GVII-G500 airplanes in this
configuration, all aircraft have been updated to GVII Block 1 software
configuration, therefore this reference to the airplane flight manual
supplement is not applicable.

The FAA has confirmed with Gulfstream that Gulfstream Aerospace
GVII-G500 Airplane Flight Manual Supplement No. GVII-G500-2020-06,
dated September 8, 2020, is no longer applicable to the existing fleet.
However, Gulfstream Aerospace GVII-G500 Airplane Flight Manual
Supplement No. GVII-G500-2020-06, dated September 8, 2020, is retained
in this AD. Operators may have previously complied with paragraph
(g)(2)(ii) of AD 2020-23-04 using GVII-G500 Airplane Flight Manual
Supplement No. GVII-G500-2020-06, dated September 8, 2020. Therefore,
to provide credit to operators who have already complied with the
service information and reduce the need for alternative method of
compliance (AMOC) requests, the FAA has determined that this AD should
include reference to GVII-G500 Airplane Flight Manual Supplement No.
GVII-G500-2020-06, dated September 8, 2020. No changes have been made
to this AD in this regard.

Conclusion

The FAA reviewed the relevant data, considered any comments
received, and determined that air safety requires adopting this AD as
proposed. Accordingly, the FAA is issuing this AD to address the unsafe
condition on these products. Except for minor editorial changes, and
any other changes described previously, this AD is adopted as proposed
in the NPRM. None of the changes will increase the economic burden on
any operator.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Gulfstream GVII-G500 Customer Bulletin No. 069 and
Gulfstream GVII-G600 Customer Bulletin No. 037, both Revision A, both
dated February 2, 2023. This service information specifies procedures
for inspecting affected fuel boost pumps for proper installation of the
impeller shaft key, marking affected fuel boost pumps that pass that
inspection, and replacing fuel boost pumps that fail. These documents
are distinct since they apply to different airplane models.

The FAA also reviewed the following AMM documents, which contain
revised maintenance procedures pertaining to the fuel boost pump. These
documents are distinct since they apply to different airplane models.

12-13-01 Defueling Procedure-Defuel, 12-13 Fueling and
Defueling Operations Replenishing, Chapter 12--Servicing, Gulfstream
Aerospace GVII-G500 Aircraft Maintenance Manual, Document Number GAC-
AC-GVII-G500-AMM-0001, Revision 16, dated November 30, 2023.

12-13-01 Defueling Procedure-Defuel, 12-13 Fueling and
Defueling Operations Replenishing, Chapter 12--Servicing, Gulfstream
Aerospace GVII-G600 Aircraft Maintenance Manual, Document Number GAC-
AC-GVII-G600-AMM-0001, Revision 12, dated November 30, 2023.

28-26-04 Fuel Boost Pump-Prime, 28-26 Engine and APU Fuel
Delivery, Chapter 28--Fuel, Gulfstream Aerospace GVII-G500 Aircraft
Maintenance Manual, Document Number GAC-AC-GVII-G500-AMM-0001, Revision
16, dated November 30, 2023.

28-26-04 Fuel Boost Pump-Removal/Installation, 28-26
Engine and APU Fuel Delivery, Chapter 28--Fuel, Gulfstream Aerospace
GVII-G600 Aircraft Maintenance Manual, Document Number GAC-AC-GVII-
G600-AMM-0001, Revision 12, dated November 30, 2023.

This AD also requires the following Gulfstream service information,
which the Director of the Federal Register approved for incorporation
by reference as of November 24, 2020 (85 FR 71232, November 8, 2020).
(Although the maintenance manual documents have the watermarked words
"advance copy" on each page of the document, these are not advance
draft copies but final versions of temporary revisions to the AMM,
pending incorporation into the AMM at the next revision.)

Gulfstream Aerospace GVII-G500 Airplane Flight Manual
Supplement No. GVII-G500 (Issue 1)--2020-05, dated September 8, 2020.

Gulfstream Aerospace GVII-G500 Airplane Flight Manual
Supplement No. GVII-G500-2020-06, dated September 8, 2020.

Gulfstream Aerospace GVII-G600 Airplane Flight Manual
Supplement No. GVII-G600-2020-06 dated September 8, 2020.

GVII-G500 Maintenance Manual 12-13-01 Defueling Procedure-
Defuel, dated August 31, 2020.

GVII-G500 Maintenance Manual 28-26-04 Fuel Boost Pump-
Prime, dated August 31, 2020.

GVII-G600 Maintenance Manual 12-13-01 Defueling Procedure-
Defuel, dated August 31, 2020.

GVII-G600 Maintenance Manual 28-26-04 Fuel Boost Pump-
Prime, dated August 31, 2020.

GVII-G600 Maintenance Manual 28-26-04 Fuel Boost Pump-
Removal/Installation, dated August 31, 2020.

GVII-G600 Maintenance Manual 28-26-05 Fuel Boost Pump
Canister-Removal/Installation, dated August 31, 2020.

This service information is reasonably available because the
interested parties have access to it through their normal course of
business or by the means identified in ADDRESSES.

Costs of Compliance

The FAA estimates that this AD affects 89 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:

Estimated Costs

ACTION	LABOR COST	PARTS COST	COST PER PRODUCT	COST ON U.S. OPERATORS
Incorporate information into AMM and AFM (retained actions from AD 2020-23-04).	2 work-hours x $85 per hour = $170.	$0	$170	$15,130
Impeller shaft key inspection (new action).	36 work-hours x $85 per hour = $3,060.	0	3,060	272,340

The FAA estimates the following costs to do any necessary part
marking and fuel boost pump replacements that would be required based
on the results of the inspection for proper installation. The FAA has
no way of determining the number of aircraft that might need these actions:

On-Condition Costs

ACTION	LABOR COST	PARTS COST	COST PER PRODUCT
Part marking	0.5 work-hour x $85 per hour = $42.50.	$10	$52.50
Fuel pump replacement (per fuel boost pump).	10 work-hours x $85 per hour = $850.	106,706	107,556

The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, some or all of the costs of
this AD may be covered under warranty, thereby reducing the cost impact
on affected operators.

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.

The FAA is 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

This AD will not have federalism implications under Executive Order
13132. This AD will 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 this AD:

(1) Is not a "significant regulatory action" under Executive Order 12866,

(2) Will not affect intrastate aviation in Alaska, 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.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.

The Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 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:

a. Removing Airworthiness Directive (AD) 2020-23-04, Amendment 39-21320
(85 FR 71232, November 9, 2020); and

b. Adding the following new AD: