Airworthiness Directives; Boeing Model 737-600, -700, -800, and -900 Series Airplanes, 50714-50716 [E8-19367]

Download as PDF 50714 Federal Register / Vol. 73, No. 168 / Thursday, August 28, 2008 / Rules and Regulations which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAAapproved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service. (3) Reporting Requirements: For any reporting requirement in this AD, under the provisions of the Paperwork Reduction Act, the Office of Management and Budget (OMB) has approved the information collection requirements and has assigned OMB Control Number 2120–0056. Issued in Renton, Washington, on August 6, 2008. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E8–19143 Filed 8–27–08; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2008–0621; Directorate Identifier 2008–NM–015–AD; Amendment 39–15653; AD 2008–17–15] RIN 2120–AA64 Airworthiness Directives; Boeing Model 737–600, –700, –800, and –900 (h) Refer to MCAI Brazilian Airworthiness Directives 2006–11–02R3 and 2006–11–03R3, Series Airplanes both effective June 13, 2008; EMBRAER AGENCY: Federal Aviation Service Bulletins 170–22–0003 and 190–22– Administration (FAA), DOT. 0002, both Revision 01, both dated November ACTION: Final rule. 5, 2007; EMBRAER Service Bulletin 170–31– Related Information 0019, Revision 01, dated June 25, 2007; and EMBRAER Service Bulletin 190–31–0009, Revision 02, dated June 29, 2007; for related information. Material Incorporated by Reference (i) You must use the applicable service information specified in Table 1 of this AD to do the actions required by this AD, unless the AD specifies otherwise. (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 Empresa Brasileira de Aeronautica S.A. (EMBRAER), P.O. Box 343—CEP 12.225, Sao Jose dos Campos—SP, Brazil. (3) You may review copies at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or 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: https:// www.archives.gov/federal-register/cfr/ibrlocations.html. 01 November 5, 2007. This AD is effective October 2, 2008. The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD as of October 2, 2008. ADDRESSES: For service information identified in this AD, contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124–2207. 01 June 25, 2007. Examining the AD Docket 01 November 5, 2007. 02 June 29, 2007. TABLE 1—MATERIAL INCORPORATED BY REFERENCE mstockstill on PROD1PC66 with RULES EMBRAER Service Bulletin— 170–22– 0003. 170–31– 0019. 190–22– 0002. 190–31– 0009. VerDate Aug<31>2005 SUMMARY: We are adopting a new airworthiness directive (AD) for certain Boeing Model 737–600, –700, –800, and –900 series airplanes. This AD requires installing hot short protector (HSP) support brackets and equipment for the fuel quantity indicating system (FQIS) fuel densitometer and other specified actions as applicable. This AD also requires revising the Airworthiness Limitations (AWLs) section of the Instructions for Continued Airworthiness to incorporate AWL No. 28–AWL–07. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent the center tank fuel densitometer from overheating and becoming a potential ignition source inside the center fuel tank, which, in combination with flammable fuel vapors, could result in a center fuel tank explosion and consequent loss of the airplane. Revision— Dated— 16:19 Aug 27, 2008 Jkt 214001 DATES: You may examine the AD docket on the Internet at https:// www.regulations.gov; or in person at the Docket Management Facility between 9 a.m. and 5 p.m., Monday through PO 00000 Frm 00014 Fmt 4700 Sfmt 4700 Friday, except Federal holidays. The AD docket contains this AD, the regulatory evaluation, any comments received, and other information. The address for the Docket Office (telephone 800–647–5527) is the Document Management Facility, U.S. Department of Transportation, Docket Operations, M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. FOR FURTHER INFORMATION CONTACT: Georgios Roussos, Aerospace Engineer, Systems and Equipment Branch, ANM– 130S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98057–3356; telephone (425) 917–6482; fax (425) 917–6590. SUPPLEMENTARY INFORMATION: Discussion We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to include an airworthiness directive (AD) that would apply to certain Boeing Model 737–600, –700, –800, and –900 series airplanes. That NPRM was published in the Federal Register on June 9, 2008 (73 FR 32491). That NPRM proposed to require installing hot short protector (HSP) support brackets and equipment for the fuel quantity indicating system (FQIS) fuel densitometer and other specified actions as applicable. That NPRM proposed to also require revising the Airworthiness Limitations (AWLs) section of the Instructions for Continued Airworthiness to incorporate AWL No. 28–AWL–07. Comments We gave the public the opportunity to participate in developing this AD. We considered the single comment received. Boeing concurs with the NPRM. Change to Final Rule Regarding Later Revisions of Service Information We removed all references to the use of ‘‘later revisions’’ of the applicable service information from this AD to be consistent with FAA and Office of the Federal Register policies. We may consider approving the use of later revisions of the service information as an alternative method of compliance with this AD, as provided by paragraph (k) of this AD. Conclusion We reviewed the relevant data, considered the comment received, and determined that air safety and the public interest require adopting the AD with the change described previously. We also determined that this change will not increase the economic burden E:\FR\FM\28AUR1.SGM 28AUR1 Federal Register / Vol. 73, No. 168 / Thursday, August 28, 2008 / Rules and Regulations on any operator or increase the scope of the AD. Costs of Compliance We estimate that this AD affects 13 airplanes of U.S. registry. The following 50715 table provides the estimated costs, at an average labor rate of $80 per work hour, for U.S. operators to comply with this AD. ESTIMATED COSTS Number of U.S.-registered airplanes Action Work hours Parts Cost per airplane Installation of HSP support brackets and equipment. AWLs revision ................... Up to 16 ...... Up to $14,698 ................... Up to $15,978 ................... 13 Up to $207,714 1 .................. None ................................. $80 .................................... 13 $1,040 List of Subjects in 14 CFR Part 39 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. Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. Regulatory Findings mstockstill on PROD1PC66 with RULES Authority for This Rulemaking Effective Date (a) This airworthiness directive (AD) is effective October 2, 2008. 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. VerDate Aug<31>2005 16:19 Aug 27, 2008 Jkt 214001 Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: I PART 39—AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: I Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new AD: I 2008–17–15 Boeing: Amendment 39–15653. Docket No. FAA–2008–0621; Directorate Identifier 2008–NM–015–AD. Affected ADs (b) None. Applicability (c) This AD applies to Boeing Model 737– 600, –700, –800, and –900 series airplanes, certificated in any category; as identified in Boeing Alert Service Bulletin 737–28A1221, Revision 1, dated November 9, 2007. Note 1: This AD requires revisions to certain operator maintenance documents to include new inspections. Compliance with these inspections is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by these inspections, the operator may not be able to accomplish the inspections described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an alternative method of compliance (AMOC) according to paragraph (k) of this AD. The request should include a description of changes to the required inspections that will ensure the continued operational safety of the airplane. PO 00000 Frm 00015 Fmt 4700 Sfmt 4700 Fleet cost Unsafe Condition (d) This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent the center tank fuel densitometer from overheating and becoming a potential ignition source inside the center fuel tank, which, in combination with flammable fuel vapors, could result in a center fuel tank explosion and consequent loss of the airplane. Compliance (e) Comply with this AD within the compliance times specified, unless already done. Installation of the Hot Short Protector (HSP) (f) Within 60 months after the effective date of this AD, install the HSP support brackets and equipment for the fuel quantity indicating system (FQIS) fuel densitometer and do all the other specified actions as applicable, by accomplishing all of the applicable actions specified in the Accomplishment Instructions of Boeing Alert Service Bulletin 737–28A1221, Revision 1, dated November 9, 2007. Airworthiness Limitations (AWLs) Revision for AWL No. 28–AWL–07 (g) Concurrently with accomplishing the actions required by paragraph (f) of this AD, revise the AWLs section of the Instructions for Continued Airworthiness (ICA) by incorporating AWL No. 28–AWL–07 of Subsection F, ‘‘AIRWORTHINESS LIMITATIONS—FUEL SYSTEM AWLs,’’ of Section 9 of the Boeing 737–600/700/800/900 Maintenance Planning Data (MPD) Document, D626A001–CMR, Revision March 2007 R2 (hereafter referred to as ‘‘the MPD’’). No Alternative Critical Design Configuration Control Limitations (CDCCLs) (h) After accomplishing the action specified in paragraph (g) of this AD, no alternative CDCCLs may be used unless the CDCCLs are approved as an alternative methods of compliance (AMOC) in accordance with the procedures specified in paragraph (k) of this AD. Credit for Actions Done According to Previous Issue of Service Bulletin (i) Actions done before the effective date of this AD in accordance with Boeing Alert Service Bulletin 737–28A1221, dated January 14, 2007, are acceptable for compliance with the requirements of paragraph (f) of this AD. E:\FR\FM\28AUR1.SGM 28AUR1 50716 Federal Register / Vol. 73, No. 168 / Thursday, August 28, 2008 / Rules and Regulations Terminating Action for AWLs Revision DEPARTMENT OF TRANSPORTATION (j) Incorporating AWL No. 28–AWL–07 into the AWLs section of the ICA in accordance with paragraph (g)(3) of AD 2008–10–10, amendment 39–15516, terminates the action required by paragraph (g) of this AD. AMOCs (k)(1) The Manager, Seattle Aircraft Certification Office, FAA, ATTN: Georgios Roussos, Aerospace Engineer, Systems and Equipment Branch, ANM–130S, 1601 Lind Avenue SW., Renton, Washington 98057– 3356; telephone (425) 917–6482; fax (425) 917–6590; has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. (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 appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. Material Incorporated by Reference (l) You must use Boeing Alert Service Bulletin 737–28A1221, Revision 1, dated November 9, 2007; and Airworthiness Limitation 28–AWL–07 of Section 9 of the Boeing 737–600/700/800/900 Maintenance Planning Data (MPD) Document, D626A001– CMR, Revision March 2007 R2; to do the actions required by this AD, unless the AD specifies otherwise. (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 Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124–2207. (3) You may review copies of the service information incorporated by reference at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington; or 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: https:// www.archives.gov/federal_register/ code_of_federal_regulations/ ibr_locations.html. mstockstill on PROD1PC66 with RULES Issued in Renton, Washington, on August 12, 2008. Michael J Kaszycki, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E8–19367 Filed 8–27–08; 8:45 am] BILLING CODE 4910–13–P VerDate Aug<31>2005 16:19 Aug 27, 2008 Jkt 214001 Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2008–0148; Directorate Identifier 2007–NM–299–AD; Amendment 39–15655; AD 2008–17–17] RIN 2120–AA64 Airworthiness Directives; Boeing Model 747 Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Final rule. AGENCY: SUMMARY: We are adopting a new airworthiness directive (AD) for all Boeing Model 747 airplanes. This AD requires a one-time inspection of certain fuselage skins at section 41 to find any external doublers that cover the inspection areas and to identify the external doublers that end on a stringer and those that do not, and related investigative and corrective actions if necessary. This AD results from reports of cracks found at fastener locations in the fuselage skins at section 41. We are issuing this AD to detect and correct fuselage skin cracks at fastener locations along the skin-to-stringer attachments, which could join together and become large and consequently result in rapid decompression of the cabin. DATES: This AD is effective October 2, 2008. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of October 2, 2008. ADDRESSES: For service information identified in this AD, contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124–2207. Examining the AD Docket You may examine the AD docket on the Internet at https:// 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 address for the Docket Office (telephone 800–647–5527) is the Document Management Facility, U.S. Department of Transportation, Docket Operations, M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. FOR FURTHER INFORMATION CONTACT: Ivan Li, Aerospace Engineer, Airframe Branch, ANM–120S, FAA, Seattle Aircraft Certification Office, 1601 Lind PO 00000 Frm 00016 Fmt 4700 Sfmt 4700 Avenue, SW., Renton, Washington 98057–3356; telephone (425) 917–6437; fax (425) 917–6590. SUPPLEMENTARY INFORMATION: Discussion We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to include an airworthiness directive (AD) that would apply to all Boeing Model 747 airplanes. That NPRM was published in the Federal Register on February 8, 2008 (73 FR 7486). That NPRM proposed to require a one-time inspection of certain fuselage skins at section 41 to find any external doublers that cover the inspection areas and to identify the external doublers that end on a stringer and those that do not, and related investigative and corrective actions if necessary. Comments We gave the public the opportunity to participate in developing this AD. We considered the comments received from the two commenters. Support for the NPRM Boeing concurs with the contents of the NPRM. Request to Either Delay Issuance of the AD or Extend the Compliance Time Japan Airlines (JAL) requests that we delay issuance of the AD until Boeing has published a revision to Boeing Alert Service Bulletin 747–53A2704, dated October 4, 2007, to extend the compliance time from 16,000 total flight cycles to 25,000 total flight cycles for accomplishing the general visual inspection for external doublers in Areas 2 and 3. If we cannot delay issuance of the AD, then JAL requests that we revise the compliance time accordingly in this AD. JAL states that Boeing has advised that only the inspection of Area 1 must be done before 16,000 total flight cycles, and that Areas 2 and 3 should be inspected together with the high frequency eddy current inspection of the skin-to-stringer attachments before 25,000 total flight cycles. JAL asserts that Boeing will revise the compliance time in the next revision to the service bulletin. We do not agree to delay issuance of this AD, or to revise the compliance time for inspecting for external doublers in Areas 2 and 3. We have coordinated with Boeing, and Boeing has no plans, at this time, to revise the service bulletin. Boeing also has confirmed that the inspection of Areas 1, 2, and 3 was left at 16,000 total flight cycles for simplicity of the compliance table in the service bulletin. Therefore, we agree that, for Groups 1 through 5 airplanes, E:\FR\FM\28AUR1.SGM 28AUR1

Agencies

[Federal Register Volume 73, Number 168 (Thursday, August 28, 2008)]
[Rules and Regulations]
[Pages 50714-50716]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E8-19367]


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

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0621; Directorate Identifier 2008-NM-015-AD; 
Amendment 39-15653; AD 2008-17-15]
RIN 2120-AA64


Airworthiness Directives; Boeing Model 737-600, -700, -800, and -
900 Series Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: We are adopting a new airworthiness directive (AD) for certain 
Boeing Model 737-600, -700, -800, and -900 series airplanes. This AD 
requires installing hot short protector (HSP) support brackets and 
equipment for the fuel quantity indicating system (FQIS) fuel 
densitometer and other specified actions as applicable. This AD also 
requires revising the Airworthiness Limitations (AWLs) section of the 
Instructions for Continued Airworthiness to incorporate AWL No. 28-AWL-
07. This AD results from fuel system reviews conducted by the 
manufacturer. We are issuing this AD to prevent the center tank fuel 
densitometer from overheating and becoming a potential ignition source 
inside the center fuel tank, which, in combination with flammable fuel 
vapors, could result in a center fuel tank explosion and consequent 
loss of the airplane.

DATES: This AD is effective October 2, 2008.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of October 2, 
2008.

ADDRESSES: For service information identified in this AD, contact 
Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-
2207.

Examining the AD Docket

    You may examine the AD docket on the Internet at https://
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 address for the 
Docket Office (telephone 800-647-5527) is the Document Management 
Facility, U.S. Department of Transportation, Docket Operations, M-30, 
West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., 
Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Georgios Roussos, Aerospace Engineer, 
Systems and Equipment Branch, ANM-130S, FAA, Seattle Aircraft 
Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98057-
3356; telephone (425) 917-6482; fax (425) 917-6590.

SUPPLEMENTARY INFORMATION:

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 to include an airworthiness directive (AD) that would apply to 
certain Boeing Model 737-600, -700, -800, and -900 series airplanes. 
That NPRM was published in the Federal Register on June 9, 2008 (73 FR 
32491). That NPRM proposed to require installing hot short protector 
(HSP) support brackets and equipment for the fuel quantity indicating 
system (FQIS) fuel densitometer and other specified actions as 
applicable. That NPRM proposed to also require revising the 
Airworthiness Limitations (AWLs) section of the Instructions for 
Continued Airworthiness to incorporate AWL No. 28-AWL-07.

Comments

    We gave the public the opportunity to participate in developing 
this AD. We considered the single comment received. Boeing concurs with 
the NPRM.

Change to Final Rule Regarding Later Revisions of Service Information

    We removed all references to the use of ``later revisions'' of the 
applicable service information from this AD to be consistent with FAA 
and Office of the Federal Register policies. We may consider approving 
the use of later revisions of the service information as an alternative 
method of compliance with this AD, as provided by paragraph (k) of this 
AD.

Conclusion

    We reviewed the relevant data, considered the comment received, and 
determined that air safety and the public interest require adopting the 
AD with the change described previously. We also determined that this 
change will not increase the economic burden

[[Page 50715]]

on any operator or increase the scope of the AD.

Costs of Compliance

    We estimate that this AD affects 13 airplanes of U.S. registry. The 
following table provides the estimated costs, at an average labor rate 
of $80 per work hour, for U.S. operators to comply with this AD.

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Number of
                                                                       Cost per        U.S.-
            Action                Work hours           Parts           airplane      registered     Fleet cost
                                                                                     airplanes
----------------------------------------------------------------------------------------------------------------
Installation of HSP support    Up to 16........  Up to $14,698...  Up to $15,978..           13  Up to $207,714
 brackets and equipment.
AWLs revision................  1...............  None............  $80............           13  $1,040
----------------------------------------------------------------------------------------------------------------

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:

2008-17-15 Boeing: Amendment 39-15653. Docket No. FAA-2008-0621; 
Directorate Identifier 2008-NM-015-AD.

Effective Date

    (a) This airworthiness directive (AD) is effective October 2, 
2008.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Boeing Model 737-600, -700, -800, and -
900 series airplanes, certificated in any category; as identified in 
Boeing Alert Service Bulletin 737-28A1221, Revision 1, dated 
November 9, 2007.

    Note 1: This AD requires revisions to certain operator 
maintenance documents to include new inspections. Compliance with 
these inspections is required by 14 CFR 91.403(c). For airplanes 
that have been previously modified, altered, or repaired in the 
areas addressed by these inspections, the operator may not be able 
to accomplish the inspections described in the revisions. In this 
situation, to comply with 14 CFR 91.403(c), the operator must 
request approval for an alternative method of compliance (AMOC) 
according to paragraph (k) of this AD. The request should include a 
description of changes to the required inspections that will ensure 
the continued operational safety of the airplane.

Unsafe Condition

    (d) This AD results from fuel system reviews conducted by the 
manufacturer. We are issuing this AD to prevent the center tank fuel 
densitometer from overheating and becoming a potential ignition 
source inside the center fuel tank, which, in combination with 
flammable fuel vapors, could result in a center fuel tank explosion 
and consequent loss of the airplane.

Compliance

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

Installation of the Hot Short Protector (HSP)

    (f) Within 60 months after the effective date of this AD, 
install the HSP support brackets and equipment for the fuel quantity 
indicating system (FQIS) fuel densitometer and do all the other 
specified actions as applicable, by accomplishing all of the 
applicable actions specified in the Accomplishment Instructions of 
Boeing Alert Service Bulletin 737-28A1221, Revision 1, dated 
November 9, 2007.

Airworthiness Limitations (AWLs) Revision for AWL No. 28-AWL-07

    (g) Concurrently with accomplishing the actions required by 
paragraph (f) of this AD, revise the AWLs section of the 
Instructions for Continued Airworthiness (ICA) by incorporating AWL 
No. 28-AWL-07 of Subsection F, ``AIRWORTHINESS LIMITATIONS--FUEL 
SYSTEM AWLs,'' of Section 9 of the Boeing 737-600/700/800/900 
Maintenance Planning Data (MPD) Document, D626A001-CMR, Revision 
March 2007 R2 (hereafter referred to as ``the MPD'').

No Alternative Critical Design Configuration Control Limitations 
(CDCCLs)

    (h) After accomplishing the action specified in paragraph (g) of 
this AD, no alternative CDCCLs may be used unless the CDCCLs are 
approved as an alternative methods of compliance (AMOC) in 
accordance with the procedures specified in paragraph (k) of this 
AD.

Credit for Actions Done According to Previous Issue of Service Bulletin

    (i) Actions done before the effective date of this AD in 
accordance with Boeing Alert Service Bulletin 737-28A1221, dated 
January 14, 2007, are acceptable for compliance with the 
requirements of paragraph (f) of this AD.

[[Page 50716]]

Terminating Action for AWLs Revision

    (j) Incorporating AWL No. 28-AWL-07 into the AWLs section of the 
ICA in accordance with paragraph (g)(3) of AD 2008-10-10, amendment 
39-15516, terminates the action required by paragraph (g) of this 
AD.

AMOCs

    (k)(1) The Manager, Seattle Aircraft Certification Office, FAA, 
ATTN: Georgios Roussos, Aerospace Engineer, Systems and Equipment 
Branch, ANM-130S, 1601 Lind Avenue SW., Renton, Washington 98057-
3356; telephone (425) 917-6482; fax (425) 917-6590; has the 
authority to approve AMOCs for this AD, if requested using the 
procedures found in 14 CFR 39.19.
    (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 appropriate principal inspector (PI) in the FAA 
Flight Standards District Office (FSDO), or lacking a PI, your local 
FSDO.

Material Incorporated by Reference

    (l) You must use Boeing Alert Service Bulletin 737-28A1221, 
Revision 1, dated November 9, 2007; and Airworthiness Limitation 28-
AWL-07 of Section 9 of the Boeing 737-600/700/800/900 Maintenance 
Planning Data (MPD) Document, D626A001-CMR, Revision March 2007 R2; 
to do the actions required by this AD, unless the AD specifies 
otherwise.
    (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 
Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 
98124-2207.
    (3) You may review copies of the service information 
incorporated by reference at the FAA, Transport Airplane 
Directorate, 1601 Lind Avenue SW., Renton, Washington; or 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: https://www.archives.gov/federal_register/code_of_federal_
regulations/ibr_locations.html.

    Issued in Renton, Washington, on August 12, 2008.
Michael J Kaszycki,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. E8-19367 Filed 8-27-08; 8:45 am]
BILLING CODE 4910-13-P
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