Airworthiness Directives; Gulfstream Model G-IV, GIV-X, and GV-SP Series Airplanes and Model GV Airplanes

[Federal Register Volume 74, Number 153 (Tuesday, August 11, 2009)]
[Rules and Regulations]
[Pages 40061-40065]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E9-19063]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2009-0683; Directorate Identifier 2009-NM-129-AD; 
Amendment 39-15991; AD 2009-17-01]
RIN 2120-AA64


Airworthiness Directives; Gulfstream Model G-IV, GIV-X, and GV-SP 
Series Airplanes and Model GV Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule; request for comments.

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SUMMARY: We are adopting a new airworthiness directive (AD) for certain 
Gulfstream Model G-IV, GIV-X, GV-SP series airplanes and Model GV 
airplanes. This AD requires, for certain airplanes, a one-time 
inspection for sealant applied to the exterior of the auxiliary power 
unit (APU) enclosure (firewall), and, for airplanes with the subject 
sealant and certain other airplanes, a revision of the airplane flight 
manual to prohibit operation of the APU during certain ground and 
flight operations. This AD results from notification from the airplane 
manufacturer that an improper, flammable sealant was used on the 
interior and exterior of the APU enclosure (firewall). We are issuing 
this AD to prevent this flammable sealant from igniting the exterior 
surfaces of the APU enclosure (firewall) under certain anomalous 
conditions such as an APU failure/APU compartment fire, which could 
result in propagation of an uncontained fire to other critical areas of 
the airplane.

DATES: This AD is effective August 26, 2009.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in the AD as of August 26, 
2009.
    We must receive comments on this AD by October 13, 2009.

ADDRESSES: You may send comments by any of the following methods:
    <bullet> Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
    <bullet> Fax: 202-493-2251.
    <bullet> 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.
    <bullet> 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 AD, contact Gulfstream 
Aerospace Corporation, Technical Publications Dept., P.O. Box 2206, 
Savannah, Georgia 31402-2206; telephone 800-810-4853; fax 912-965-3520; 
e-mail [email protected]; Internet http://www.gulfstream.com/product_support/technical_pubs/pubs/index.htm.

Examining the AD Docket

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

FOR FURTHER INFORMATION CONTACT: Sanford Proveaux, Aerospace Engineer, 
Propulsion and Services Branch, ACE-118A, FAA, Atlanta Aircraft 
Certification Office, One Crown Center, 1895 Phoenix Boulevard, Suite 
450, Atlanta, Georgia 30349; telephone (770) 703-6049; fax (770) 703-
6097.

SUPPLEMENTARY INFORMATION: 

Discussion

    The manufacturer has notified us that an improper, flammable 
sealant (GMS 4107) was used on interior angles formed by sheet 
intersections and titanium sheet mating surfaces of the auxiliary power 
unit (APU) enclosure (firewall). This flammable sealant was also used 
to coat rivet heads on the interior and exterior surfaces of the APU 
enclosure (firewall). In some places the sealant was used by design, 
and in other places it was used in error. This sealant could ignite the 
exterior surfaces of the APU enclosure (firewall) under certain 
anomalous conditions such as an APU failure/APU compartment fire. This 
condition, if not corrected, could result in propagation of an 
uncontained fire to other critical areas of the airplane.

Relevant Service Information

    We reviewed the Gulfstream alert customer bulletins listed in the 
following table. The alert customer bulletins for Model G-IV series 
airplanes and Model GV airplanes describe procedures for a one-time 
inspection of the APU enclosure (firewall) for overcoat application of 
the flammable sealant on rivets or fillet seals on panel joints. For 
Model GIV-X and GV-SP series airplanes, and airplanes with flammable 
sealant found during the inspection, the alert customer bulletins 
describe revising the applicable airplane flight manual (AFM) and 
reporting compliance to Gulfstream.

[[Page 40062]]



                              Table--Applicable Gulfstream Alert Customer Bulletins
----------------------------------------------------------------------------------------------------------------
             For model--                        Use--               Which includes--             To the--
----------------------------------------------------------------------------------------------------------------
G-IV (G300) series airplanes.........  Gulfstream G300 Alert    Gulfstream G-IV/G300/    Gulfstream G300 AFM.
                                        Customer Bulletin 40A,   G400 AFM Supplement G-
                                        dated June 30, 2009,     IV-2009-02, Revision
                                        including Service        1, dated June 25, 2009.
                                        Reply Card, Parts I
                                        and II.
G-IV (G400) series airplanes.........  Gulfstream G400 Alert    Gulfstream G-IV/G300/    Gulfstream G400 AFM.
                                        Customer Bulletin 40A,   G400 AFM Supplement G-
                                        dated June 30, 2009,     IV-2009-02, Revision
                                        including Service        1, dated June 25, 2009.
                                        Reply Card, Parts I
                                        and II.
G-IV series airplanes................  Gulfstream IV Alert      Gulfstream G-IV/G300/    Gulfstream G-IV AFM.
                                        Customer Bulletin 40A,   G400 AFM Supplement G-
                                        dated June 30, 2009,     IV-2009-02, Revision
                                        including Service        1, dated June 25, 2009.
                                        Reply Card, Parts I
                                        and II.
GIV-X (G350) series airplanes........  Gulfstream G350 Alert    Gulfstream G450/G350     Gulfstream G350 AFM.
                                        Customer Bulletin 8A,    AFM Supplement G450-
                                        dated June 30, 2009,     2009-03, Revision 1,
                                        including Service        dated June 25, 2009.
                                        Reply Card.
GIV-X (G450) series airplanes........  Gulfstream G450 Alert    Gulfstream G450/G350     Gulfstream G450 AFM.
                                        Customer Bulletin 8A,    AFM Supplement G450-
                                        dated June 30, 2009,     2009-03, Revision 1,
                                        including Service        dated June 25, 2009.
                                        Reply Card.
GV airplanes.........................  Gulfstream V Alert       Gulfstream GV AFM        Gulfstream GV AFM.
                                        Customer Bulletin 29A,   Supplement GV-2009-03,
                                        dated June 30, 2009,     Revision 1, dated June
                                        including Service        25, 2009.
                                        Reply Card, Parts I
                                        and II.
GV-SP (G500) series airplanes........  Gulfstream G500 Alert    Gulfstream G550/G500     Gulfstream G500 AFM.
                                        Customer Bulletin 9A,    AFM Supplement G550-
                                        dated June 30, 2009,     2009-03, Revision 1,
                                        including Service        dated June 25, 2009.
                                        Reply Card.
GV-SP (G550) series airplanes........  Gulfstream G550 Alert    Gulfstream G550/G500     Gulfstream G550 AFM.
                                        Customer Bulletin 9A,    AFM Supplement G550-
                                        dated June 30, 2009,     2009-03, Revision 1,
                                        including Service        dated June 25, 2009.
                                        Reply Card.
----------------------------------------------------------------------------------------------------------------

FAA's Determination and Requirements of This AD

    We are issuing this AD because we evaluated all the relevant 
information and determined the unsafe condition described previously is 
likely to exist or develop in other products of these same type 
designs. This AD requires accomplishing the actions specified in the 
service information described previously, except as discussed under 
``Differences Between the AD and the Service Information.''

Differences Between the AD and the Service Information

    Although the Gulfstream alert customer bulletins specified in the 
table titled ``Table 1--Applicable alert customer bulletins including 
airplane flight manual (AFM) supplements, and AFMs'' of this AD specify 
to submit information to the manufacturer, this AD does not include 
such a requirement.
    Although certain Gulfstream alert customer bulletins specified in 
the table titled ``Table 1--Applicable alert customer bulletins 
including airplane flight manual (AFM) supplements, and AFMs'' of this 
AD specify only to ``inspect'' for flammable sealant on the APU 
enclosure (firewall), we have determined that the procedures in those 
Gulfstream alert customer bulletins should be described as a ``general 
visual inspection.'' Note 1 has been included in this AD to define this 
type of inspection.

Clarification of Statement in Gulfstream Alert Customer Bulletins

    The Gulfstream alert customer bulletins specified in the table 
titled ``Table 1--Applicable alert customer bulletins including 
airplane flight manual (AFM) supplements, and AFMs'' of this AD include 
a statement in the Accomplishment Instructions to inform operators to 
contact Gulfstream ``if technical assistance is required'' in 
accomplishing the actions specified in the alert customer bulletins. We 
have included Note 2 in this AD to clarify that any deviation from the 
instructions provided in the applicable alert customer bulletin must be 
approved as an alternative method of compliance under the provisions of 
paragraph (l) of this AD.

Interim Action

    We consider this AD interim action. If final action is later 
identified, we might consider further rulemaking then.

FAA's Justification and Determination of the Effective Date

    The use of flammable sealant in the construction of the primary APU 
enclosure (firewall) compromises the integrity of the enclosure 
(firewall). If an APU fire occurs, the flammable sealant can ignite the 
exterior of the APU enclosure (firewall). This area is very confined 
and surrounded by primary airframe structure that carries the empennage 
loads. Primary flight controls for pitch and yaw are routed through the 
area adjacent to the APU enclosure (firewall). Because of our 
requirement to promote safe flight of civil aircraft and thus the 
critical need to assure the structural integrity and proper functioning 
of the APU enclosure (firewall), and the short compliance time involved 
with this action, this AD must be issued immediately.
    Because an unsafe condition exists that requires the immediate 
adoption of this AD, we find that notice and opportunity for prior 
public comment hereon are impracticable and that good cause exists for 
making this amendment effective in less than 30 days.

Comments Invited

    This AD is a final rule that involves requirements affecting flight 
safety, and we did not provide you with notice and an opportunity to 
provide your comments before it becomes effective. However, we invite 
you to send any written data, views, or arguments about this AD. Send 
your comments to an address listed under the ADDRESSES section. Include 
``Docket No. FAA-2009-0683; Directorate Identifier 2009-NM-129-AD'' at 
the beginning of your comments. We specifically invite comments on the 
overall regulatory, economic, environmental, and energy aspects of this 
AD. We will consider all comments received by the closing date and may 
amend this AD because of those comments.
    We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We

[[Page 40063]]

will also post a report summarizing each substantive verbal contact we 
receive about this AD.

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

    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) Is not a ``significant rule'' under 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.
    You can find our regulatory evaluation and the estimated costs of 
compliance in the AD Docket.

List of Subjects in 14 CFR Part 39

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

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator, 
the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
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]

0
2. The FAA amends Sec.  39.13 by adding the following new AD:

2009-17-01 Gulfstream Aerospace Corporation: Amendment 39-15991. 
Docket No. FAA-2009-0683; Directorate Identifier 2009-NM-129-AD.

Effective Date

    (a) This airworthiness directive (AD) is effective August 26, 
2009.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to the Gulfstream airplanes identified in 
paragraphs (c)(1), (c)(2), (c)(3), and (c)(4) of this AD, 
certificated in any category.
    (1) Model G-IV series airplanes, having serial numbers (S/Ns) 
1000 and subsequent.
    (2) Model GIV-X series airplanes, having S/Ns 4001 through 4146 
inclusive, and S/Ns 4148 through 4150 inclusive.
    (3) Model GV airplanes, having S/Ns 501 and subsequent.
    (4) Model GV-SP series airplanes, having S/Ns 5001 through 5204 
inclusive, S/Ns 5206 through 5217 inclusive, and S/N 5219.

Subject

    (d) Air Transport Association (ATA) of America Codes 53: 
Fuselage, and 49: Airborne Auxiliary Power.

Unsafe Condition

    (e) This AD results from notification from the airplane 
manufacturer that an improper, flammable sealant was used on the 
interior and exterior of the auxiliary power unit (APU) enclosure 
(firewall). The Federal Aviation Administration is issuing this AD 
to prevent this flammable sealant from igniting the exterior 
surfaces of the APU enclosure (firewall) under certain anomalous 
conditions such as an APU failure/APU compartment fire, which could 
result in propagation of an uncontained fire to other critical areas 
of the airplane.

Compliance

    (f) You are responsible for having the actions required by this 
AD performed within the compliance times specified, unless the 
actions have already been done.

Inspection for Flammable Sealant

    (g) For Model G-IV series airplanes identified in paragraph 
(c)(1) of this AD, and Model GV airplanes identified in paragraph 
(c)(3) of this AD: Within 21 days after the effective date of this 
AD, except as provided by paragraph (k) of this AD, perform a 
general visual inspection of the exterior of the APU enclosure 
(firewall) to detect overcoat application of sealant on rivets or 
fillet seals on panel joints, in accordance with the Accomplishment 
Instructions of the applicable Gulfstream alert customer bulletin 
specified in Table 1 of this AD.

    Table 1--Applicable Alert Customer Bulletins Including Airplane Flight Manual (AFM) Supplements, and AFMs
----------------------------------------------------------------------------------------------------------------
             For model--                        Use--               Which includes--             To the--
----------------------------------------------------------------------------------------------------------------
G-IV (G300) series airplanes.........  Gulfstream G300 Alert    Gulfstream G-IV/G300/    Gulfstream G300 AFM.
                                        Customer Bulletin 40A,   G400 AFM Supplement G-
                                        dated June 30, 2009,     IV-2009-02, Revision
                                        including Service        1, dated June 25, 2009.
                                        Reply Card, Parts I
                                        and II.
G-IV (G400) series airplanes.........  Gulfstream G400 Alert    Gulfstream G-IV/G300/    Gulfstream G400 AFM.
                                        Customer Bulletin 40A,   G400 AFM Supplement G-
                                        dated June 30, 2009,     IV-2009-02, Revision
                                        including Service        1, dated June 25, 2009.
                                        Reply Card, Parts I
                                        and II.
G-IV series airplanes................  Gulfstream IV Alert      Gulfstream G-IV/G300/    Gulfstream G-IV AFM.
                                        Customer Bulletin 40A,   G400 AFM Supplement G-
                                        dated June 30, 2009,     IV-2009-02, Revision
                                        including Service        1, dated June 25, 2009.
                                        Reply Card, Parts I
                                        and II.
GIV-X (G350) series airplanes........  Gulfstream G350 Alert    Gulfstream G450/G350     Gulfstream G350 AFM.
                                        Customer Bulletin 8A,    AFM Supplement G450-
                                        dated June 30, 2009,     2009-03, Revision 1,
                                        including Service        dated June 25, 2009.
                                        Reply Card.
GIV-X (G450) series airplanes........  Gulfstream G450 Alert    Gulfstream G450/G350     Gulfstream G450 AFM.
                                        Customer Bulletin 8A,    AFM Supplement G450-
                                        dated June 30, 2009,     2009-03, Revision 1,
                                        including Service        dated June 25, 2009.
                                        Reply Card.
GV airplanes.........................  Gulfstream V Alert       Gulfstream GV AFM        Gulfstream GV AFM.
                                        Customer Bulletin 29A,   Supplement GV-2009-03,
                                        dated June 30, 2009,     Revision 1, dated June
                                        including Service        25, 2009.
                                        Reply Card, Parts I
                                        and II.

[[Page 40064]]

 
GV-SP (G500) series airplanes........  Gulfstream G500 Alert    Gulfstream G550/G500     Gulfstream G500 AFM.
                                        Customer Bulletin 9A,    AFM Supplement G550-
                                        dated June 30, 2009,     2009-03, Revision 1,
                                        including Service        dated June 25, 2009.
                                        Reply Card.
GV-SP (G550) series airplanes........  Gulfstream G550 Alert    Gulfstream G550/G500     Gulfstream G550 AFM.
                                        Customer Bulletin 9A,    AFM Supplement G550-
                                        dated June 30, 2009,     2009-03, Revision 1,
                                        including Service        dated June 25, 2009.
                                        Reply Card.
----------------------------------------------------------------------------------------------------------------

    (1) If no exterior sealant is found applied during the 
inspection done in accordance with paragraph (g) of this AD: No 
further action is required by this paragraph.
    (2) If exterior sealant is found applied during the inspection 
done in accordance with paragraph (g) of this AD: Do the actions 
specified in paragraph (h) of this AD.

    Note 1: For the purposes of this AD, a general visual inspection 
is: ``A visual examination of an interior or exterior area, 
installation, or assembly to detect obvious damage, failure, or 
irregularity. This level of inspection is made from within touching 
distance unless otherwise specified. A mirror may be necessary to 
ensure visual access to all surfaces in the inspection area. This 
level of inspection is made under normally available lighting 
conditions such as daylight, hangar lighting, flashlight, or 
droplight and may require removal or opening of access panels or 
doors. Stands, ladders, or platforms may be required to gain 
proximity to the area being checked.''


    Note 2: A statement in the Accomplishment Instructions of the 
applicable Gulfstream alert customer bulletins specified in Table 1 
of this AD instructs operators to contact Gulfstream if technical 
assistance is needed in accomplishing the alert customer bulletin. 
However, any deviation from the instructions provided in the 
applicable alert customer bulletin must be approved as an 
alternative method of compliance under paragraph (l) of this AD.

Revision of the AFM

    (h) For Model GIV-X series airplanes identified in paragraph 
(c)(2) of this AD, Model GV-SP series airplanes identified in 
paragraph (c)(4) of this AD, and Model G-IV series airplanes and 
Model GV airplanes with flammable sealant on the exterior of the APU 
enclosure (firewall) identified during the inspection required by 
paragraph (g) of this AD: At the applicable time specified in 
paragraph (h)(1) or (h)(2) of this AD, revise the Limitations 
Section of the applicable Gulfstream AFM specified in Table 1 of 
this AD to include the information in the applicable Gulfstream AFM 
supplement specified in Table 1 of this AD. These AFM supplements 
introduce limitations on the use of the APU during certain ground 
and flight operations.

    Note 3: This AFM revision may be done by inserting a copy of the 
applicable AFM supplement into the applicable AFM specified in Table 
1 of this AD. When the supplement has been included in the general 
revisions of the AFM, the general revisions may be inserted in the 
AFM, provided the relevant information in the general revision is 
identical to that in the applicable AFM supplement specified in 
Table 1 of this AD.

    (1) For Model G-IV series airplanes and Model GV airplanes with 
flammable sealant on the exterior of the APU enclosure (firewall) 
identified during the inspection required by paragraph (g) of this 
AD: Prior to further flight following the inspection done in 
accordance with paragraph (g) of this AD.
    (2) For Model GIV-X series airplanes identified in paragraph 
(c)(2) of this AD, and Model GV-SP series airplanes identified in 
paragraph (c)(4) of this AD: Within 21 days after the effective date 
of this AD.

Credit for Actions Done Using Previous Service Information

    (i) Inspecting for flammable sealant and revising the AFM before 
the effective date of this AD using the applicable alert customer 
bulletin and AFM supplement specified in Table 2 of this AD are 
acceptable for compliance with the corresponding actions specified 
in this AD.

                     Table 2--Acceptable Alert Customer Bulletins Including AFM Supplements
----------------------------------------------------------------------------------------------------------------
             For model--                        Use--               Which includes--             To the--
----------------------------------------------------------------------------------------------------------------
G-IV (G300) series airplanes.........  Gulfstream G300 Alert    Gulfstream G-IV/G300/    Gulfstream G300 AFM.
                                        Customer Bulletin 40,    G400 AFM Supplement G-
                                        dated May 21, 2009,      IV-2009-02, dated May
                                        including Service        19, 2009.
                                        Reply Card, Parts I
                                        and II.
G-IV (G400) series airplanes.........  Gulfstream Alert         Gulfstream G-IV/G300/    Gulfstream G400 AFM.
                                        Customer Bulletin 40,    G400 AFM Supplement G-
                                        dated May 21, 2009,      IV-2009-02, dated May
                                        including Service        19, 2009.
                                        Reply Card, Parts I
                                        and II.
G-IV series airplanes................  Gulfstream Alert         Gulfstream G-IV/G300/    Gulfstream G-IV AFM.
                                        Customer Bulletin 40,    G400 AFM Supplement G-
                                        dated May 21, 2009,      IV-2009-02, dated May
                                        including Service        19, 2009.
                                        Reply Card, Parts I
                                        and II.
GIV-X (G350) series airplanes........  Gulfstream Alert         Gulfstream G450/G350     Gulfstream G350 AFM.
                                        Customer Bulletin 8,     AFM Supplement G450-
                                        dated May 21, 2009,      2009-03, dated May 19,
                                        including Service        2009.
                                        Reply Card.
GIV-X (G450) series airplanes........  Gulfstream Alert         Gulfstream G450/G350     Gulfstream G450 AFM.
                                        Customer Bulletin 8,     AFM Supplement G450-
                                        dated May 21, 2009,      2009-03, dated May 19,
                                        including Service        2009.
                                        Reply Card.
GV airplanes.........................  Gulfstream Alert         Gulfstream GV AFM        Gulfstream GV AFM.
                                        Customer Bulletin 29,    Supplement GV-2009-03,
                                        dated May 21, 2009,      dated May 19, 2009.
                                        including Service
                                        Reply Card, Parts I
                                        and II.
GV-SP (G500) series airplanes........  Gulfstream Alert         Gulfstream G550/G500     Gulfstream G500 AFM.
                                        Customer Bulletin 9,     AFM Supplement G550-
                                        dated May 21, 2009,      2009-03, dated May 19,
                                        including Service        2009.
                                        Reply Card.
GV-SP (G550) series airplanes........  Gulfstream Alert         Gulfstream G550/G500     Gulfstream G550 AFM.
                                        Customer Bulletin 9,     AFM Supplement G550-
                                        dated May 21, 2009,      2009-03, dated May 19,
                                        including Service        2009.
                                        Reply Card.
----------------------------------------------------------------------------------------------------------------


[[Page 40065]]

No Reporting Required

    (j) Although the Gulfstream alert customer bulletins specified 
in Table 1 of this AD specify to submit information to the 
manufacturer, this AD does not include this requirement.

Parts Installation

    (k) As of the effective date of this AD, no person may install 
an APU enclosure (firewall) that contains flammable sealant (GMS 
4107) in the construction, on any airplane.

Alternative Methods of Compliance (AMOCs)

    (l)(1) The Manager, Atlanta Aircraft Certification Office, FAA, 
has the authority to approve AMOCs for this AD, if requested using 
the procedures found in 14 CFR 39.19. Send information to ATTN: 
Sanford Proveaux, Aerospace Engineer, Propulsion and Services 
Branch, ACE-118A, FAA, Atlanta Aircraft Certification Office, One 
Crown Center, 1895 Phoenix Boulevard, Suite 450, Atlanta, Georgia 
30349; telephone (770) 703-6049; fax (770) 703-6097.
    (2) To request a different method of compliance or a different 
compliance time for this AD, follow the procedures in 14 CFR 39.19. 
Before using any approved AMOC on any airplane to which the AMOC 
applies, notify your principal maintenance inspector (PMI) or 
principal avionics inspector (PAI), as appropriate, or lacking a 
principal inspector, your local Flight Standards District Office. 
The AMOC approval letter must specifically reference this AD.

Material Incorporated by Reference

    (m) You must use the service information contained in Table 3 of 
this AD to do the actions required by this AD, as applicable, unless 
the AD specifies otherwise.

               Table 3--Material Incorporated by Reference
------------------------------------------------------------------------
   Alert customer bulletin--       AFM supplement--           AFM--
------------------------------------------------------------------------
Gulfstream G300 Alert Customer  Gulfstream G-IV/G300/   Gulfstream G300
 Bulletin 40A, dated June 30,    G400 AFM Supplement G-  AFM.
 2009, including Service Reply   IV-2009-02, Revision
 Card, Parts I and II.           1, dated June 25,
                                 2009.
Gulfstream G400 Alert Customer  Gulfstream G-IV/G300/   Gulfstream G400
 Bulletin 40A, dated June 30,    G400 AFM Supplement G-  AFM.
 2009, including Service Reply   IV-2009-02, Revision
 Card, Parts I and II.           1, dated June 25,
                                 2009.
Gulfstream IV Alert Customer    Gulfstream G-IV/G300/   Gulfstream G-IV
 Bulletin 40A, dated June 30,    G400 AFM Supplement G-  AFM.
 2009, including Service Reply   IV-2009-02, Revision
 Card, Parts I and II.           1, dated June 25,
                                 2009.
Gulfstream G350 Alert Customer  Gulfstream G450/G350    Gulfstream G350
 Bulletin 8A, dated June 30,     AFM Supplement G450-    AFM.
 2009, including Service Reply   2009-03, Revision 1,
 Card.                           dated June 25, 2009.
Gulfstream G450 Alert Customer  Gulfstream G450/G350    Gulfstream G450
 Bulletin 8A, dated June 30,     AFM Supplement G450-    AFM.
 2009, including Service Reply   2009-03, Revision 1,
 Card.                           dated June 25, 2009.
Gulfstream V Alert Customer     Gulfstream GV AFM       Gulfstream GV
 Bulletin 29A, dated June 30,    Supplement GV-2009-     AFM.
 2009, including Service Reply   03, Revision 1, dated
 Card, Parts I and II.           June 25, 2009.
Gulfstream G500 Alert Customer  Gulfstream G550/G500    Gulfstream G500
 Bulletin 9A, dated June 30,     AFM Supplement G550-    AFM.
 2009, including Service Reply   2009-03, Revision 1,
 Card.                           dated June 25, 2009.
Gulfstream G550 Alert Customer  Gulfstream G550/G500    Gulfstream G550
 Bulletin 9A, dated June 30,     AFM Supplement G550-    AFM.
 2009, including Service Reply   2009-03, Revision 1,
 Card.                           dated June 25, 2009.
------------------------------------------------------------------------

     (1) The Director of the Federal Register approved the 
incorporation by reference of this service information under 5 
U.S.C. 552(a) and 1 CFR part 51.
    (2) For service information identified in this AD, contact 
Gulfstream Aerospace Corporation, Technical Publications Dept., P.O. 
Box 2206, Savannah, Georgia 31402-2206; telephone 800-810-4853; fax 
912-965-3520; e-mail [email protected]; Internet http://www.gulfstream.com/product_support/technical_pubs/pubs/index.htm.
    (3) You may review copies of the service information at the FAA, 
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, 
Washington. For information on the availability of this material at 
the FAA, call 425-227-1221 or 425-227-1152.
    (4) You may also review copies of the service information that 
is incorporated by reference at the National Archives and Records 
Administration (NARA). For information on the availability of this 
material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.

    Issued in Renton, Washington, on July 31, 2009.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. E9-19063 Filed 8-10-09; 8:45 am]
BILLING CODE 4910-13-P

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