Document ID: FAA-2007-28383-0012
Agency: faa
Document Type: Rule
Title: Airworthiness Directives; Boeing Model 737-100, -200, -200C, - 300, -400, and -500 Series Airplanes
Posted Date: 2008-05-08T04:00Z

[Federal Register: May 8, 2008 (Volume 73, Number 90)]
[Rules and Regulations]               
[Page 25970-25974]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr08my08-4]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2007-28383; Directorate Identifier 2006-NM-180-AD; 
Amendment 39-15515; AD 2008-10-09]
RIN 2120-AA64

 
Airworthiness Directives; Boeing Model 737-100, -200, -200C, -
300, -400, and -500 Series Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: We are adopting a new airworthiness directive (AD) for all 
Boeing Model 737-100, -200, -200C, -300, -400, and -500 series 
airplanes. This AD requires revising the FAA-approved maintenance 
program to incorporate new airworthiness limitations (AWLs) for fuel 
tank systems to satisfy Special Federal Aviation Regulation No. 88 
requirements. This AD also requires the initial inspection of a certain 
repetitive AWL inspection to phase in that inspection, and repair if 
necessary. This AD results from a design review of the fuel tank 
system. We are issuing this AD to prevent the potential for ignition 
sources inside fuel tanks caused by latent failures, alterations, 
repairs, or maintenance actions, which, in combination with flammable 
fuel vapors, could result in a fuel tank explosion and consequent loss 
of the airplane.

DATES: This AD is effective June 12, 2008.
    The Director of the Federal Register approved the incorporation by 
reference of a certain publication listed in this AD as of June 12, 
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 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 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: Sue Lucier, Aerospace Engineer, 
Propulsion Branch, ANM-140S, FAA, Seattle Aircraft Certification 
Office, 1601 Lind Avenue, SW., Renton, Washington 98057-3356; telephone 
(425) 917-6438; 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 737-100, -200, -200C, -300, -400, and -500 series 
airplanes. That NPRM was published in the Federal Register on July 6, 
2007 (72 FR 36907). That NPRM proposed to require revising the FAA-
approved maintenance program to incorporate new airworthiness 
limitations (AWLs) for fuel tank systems to satisfy Special Federal 
Aviation Regulation No. 88 requirements. That NPRM also proposed to 
require the initial inspection of a certain repetitive AWL inspection 
to phase in that inspection, and repair if necessary.

Actions Since NPRM Was Issued

    Since we issued the NPRM, Boeing has issued Revision March 2008 of 
the 737-100/200/200C/300/400/500 Airworthiness Limitations (AWLs) and 
Certification Maintenance Requirements (CMRs), D6-38278-CMR (hereafter 
referred to as ``Revision March 2008 of Document D6-38278-CMR''). The 
NPRM referred to Revision May 2006 of Document D6-38278-CMR as the 
appropriate source of service information for accomplishing the 
proposed actions. Revision March 2008 of Document D6-38278-CMR, among 
other actions, includes the following changes:
     Removes the repetitive task interval of 36,000 flight 
cycles from AWLs No. 28-AWL-01 and No. 28-AWL-03.
     Revises the task description for AWL No. 28-AWL-01 to 
harmonize it with AWL No. 28-AWL-02 by removing references to certain 
station numbers.
     Revises AWL No. 28-AWL-03 to reflect the new maximum loop 
resistance values associated with the lightning protection of the 
unpressurized fuel quantity indicating system (FQIS) wire bundle 
installations.
    Accordingly, we have revised paragraphs (f), (g), and (h) of this 
AD to refer to Revision March 2008 of Document D6-38278-CMR. We also 
have added a new paragraph (j) to this AD specifying that actions done 
before the effective date of this AD in accordance with Revisions May 
2006 through November 2007 of Document D6-38278-CMR are acceptable for 
compliance with the corresponding requirements of paragraphs (g) and 
(h) of this AD.
    We also have removed reference to 36,000 total flight hours from 
paragraph (h)(1) of this AD and revised the initial threshold for 
accomplishing AWL No. 28-AWL-03 to within 120 months since the date of 
issuance of the original standard airworthiness certificate or the date 
of issuance of the original export certificate of airworthiness.
    Operators should note that paragraph (g) of this AD requires only 
incorporating AWLs No. 28-AWL-01 through No. 28-AWL-20 inclusive for 
Model 737-100, -200, and -200C series airplanes, and AWLs No. 28-AWL-01 
through No. 28-AWL-19 inclusive for Model 737-300, -400, and -500 
series airplanes. Revision September 2006 of Document D6-38278-CMR 
added AWL inspections of the fuel boost pump auto shutoff system for 
the center and auxiliary fuel tanks (specified as AWLs No. 28-AWL-20 
and No. 28-AWL-21 for Model 737-300, -400, and -500 series airplanes, 
and AWLs No. 28-

[[Page 25971]]

AWL-21 and No. 28-AWL-22 for Model 737-100, -200, and -200C series 
airplanes). Revision November 2007 of Document D6-38278-CMR added an 
AWL inspection of the boost pump ground fault interrupter (specified as 
AWL No. 28-AWL-22 for Model 737-300, -400, and -500 series airplanes, 
and AWL No. 28-AWL-23 for Model 737-100, -200, and -200C series 
airplanes). We might issue additional rulemaking to require the 
incorporation of those AWLs. However, as an optional action, operators 
may incorporate those AWLs as specified in paragraph (g) of this AD.

Other Changes Made to This AD

    For standardization purposes, we have revised this AD in the 
following ways:
     We have added a new paragraph (i) to this AD to specify 
that no alternative inspections, inspection intervals, or critical 
design configuration control limitations (CDCCLs) may be used unless 
they are part of a later approved revision of Revision March 2008 of 
Document D6-38278-CMR, or unless they are approved as an alternative 
method of compliance (AMOC). Inclusion of this paragraph in the AD is 
intended to ensure that the AD-mandated airworthiness limitations 
changes are treated the same as the airworthiness limitations issued 
with the original type certificate.
     We have revised Note 1 of this AD to clarify that an 
operator must request approval for an AMOC if the operator cannot 
accomplish the required inspections because an airplane has been 
previously modified, altered, or repaired in the areas addressed by the 
required inspections.
     We have revised paragraph (h) of this AD to specify that 
accomplishing AWL No. 28-AWL-03 as part of an FAA-approved maintenance 
program before the applicable compliance time constitutes compliance 
with the applicable requirements of that paragraph.
     We have deleted Appendix 1 and Appendix 2 from this AD, 
since Revision March 2008 of Document D6-38278-CMR already contains 
most of the updated information that is listed in those appendices of 
the NPRM.

Comments

    We gave the public the opportunity to participate in developing 
this AD. We considered the comments received from the five commenters.

Request To Revise the Loop Resistance Values for AWL No. 28-AWL-03

    Boeing, KLM Royal Dutch Airlines (KLM), and Lufthansa state that 
the loop resistance values for AWL No. 28-AWL-03 specified in Revision 
May 2006 of Document D6-38278-CMR are going to be revised, since those 
values are relevant for production airplanes. The commenters also state 
that the revised values will be more representative of the expected 
values for in-service airplanes. Boeing points out that, according to 
paragraph (h) of the NPRM, the revised values should be able to be used 
in accordance with a later revision of the CMR if the revision is 
approved by the Seattle Aircraft Certification Office (ACO), FAA.
    We agree that operators may use the revised loop resistance values 
for AWL No. 28-AWL-03 in accordance with Revision March 2008 of 
Document D6-38278-CMR. As stated previously, we have revised this AD 
accordingly.

Request To Revise Intervals for Certain AWL Inspections

    KLM, on behalf of several operators, requests that we review a 45-
page proposal to align certain airworthiness limitation item (ALI) 
intervals with the applicable maintenance significant item (MSI) and 
enhanced zonal analysis procedure (EZAP) intervals for Model 737, 747, 
757, 767, and 777 airplanes. The recommendations in that proposal 
ensure that the ALI intervals align with the maintenance schedules of 
the operators. Among other changes, the proposal recommends extending 
certain AWL inspection intervals from 10 years/36,000 flight cycles to 
12 years for Model 737-100, -200, -300, -400, and -500 series 
airplanes.
    Lufthansa and the Air Transport Association (ATA), on behalf of its 
member U.S. Airways, both note an inconsistency between the inspection 
interval specified in Revision May 2006 of Document D6-38278-CMR and 
the compliance threshold specified in paragraph (h)(1) of the NPRM. The 
NPRM specifies accomplishing the initial inspection within 36,000 total 
flight hours or 120 months since the date of issuance of the original 
standard airworthiness certificate or the date of issuance of the 
original export certificate of airworthiness, whichever occurs first. 
However, Revision May 2006 of Document D6-38278-CMR specifies a 
repetitive interval of 36,000 total flight cycles or 120 months, 
whichever occurs first. U.S. Airways requests we verify whether the 
initial inspection interval should be in units of flight cycles or 
flight hours.
    We disagree with KLM's request to extend certain AWL inspection 
intervals to 12 years. However, as stated previously, we have deleted 
the 36,000-total-flight-hour parameter from paragraph (h)(1) of this AD 
to correspond with the task interval for AWL No. 28-AWL-03 as specified 
in Revision March 2008 of Document D6-38278-CMR. In developing an 
appropriate compliance time for this action, we considered the urgency 
associated with the subject unsafe condition and the practical aspect 
of accomplishing the required actions within a period of time that 
corresponds to the normal scheduled maintenance for most affected 
operators. However, according to the provisions of paragraph (k) of 
this AD, we might approve requests to adjust the compliance time if the 
request includes data that prove that the new compliance time would 
provide an acceptable level of safety.

Request To Revise Note 1

    Boeing requests that we revise Note 1 of the NPRM to clarify the 
need for an AMOC. Boeing states that the current wording is difficult 
to follow, and that the note is meant to inform operators that an AMOC 
to the required AWLs might be required if an operator has previously 
modified, altered, or repaired the areas addressed by the limitations. 
Boeing requests that we revise Note 1 as follows:
     Add the words ``according to paragraph (g)'' at the end of 
the first sentence.
     Replace the words ``revision to'' with ``deviation from'' 
in the last sentence.
     Delete the words ``(g) or'' and ``as applicable'' from the 
last sentence.
    As stated previously, we have clarified the language in Note 1 of 
this AD for standardization with other similar ADs. The language the 
commenter requests that we change does not appear in the revised note. 
Therefore, no additional change to this AD is necessary in this regard.

Request To Extend the Grace Period for AWL No. 28-AWL-03

    KLM expects to have problems accomplishing the initial inspection 
of AWL No. 28-AWL-03 within the 24-month grace period. The commenter 
states that if it does the check and does not reach the specified 
values, then tank entry outside of heavy maintenance would be 
necessary. The commenter also states that it would be helpful to plan 
to do this inspection during an overhaul.
    We infer that KLM requests that we extend the grace period for AWL 
No.

[[Page 25972]]

28-AWL-03 in paragraph (h) of this AD to allow accomplishing the 
initial inspection during a regularly scheduled ``D'' check (about 6 
years). We disagree with extending the grace period to 6 years. In 
developing an appropriate compliance time for this action, we 
considered the safety implications, the rate of lightning strikes in 
the fleet, and the average age of the fleet. In consideration of these 
items, we have determined that an initial compliance time of 120 months 
(as discussed previously) with a grace period of 24 months will ensure 
an acceptable level of safety. We have not changed the grace period for 
AWL No. 28-AWL-03 in this regard.

Request To Add Applicability to Paragraph (g)

    Lufthansa states that the applicability of the AWL tasks should be 
included in the AWL table of the AD.
    We infer the commenter requests that we include the applicability 
for AWL No. 28-AWL-03 in paragraph (g) of this AD. (The commenter made 
the same request for a similar NPRM, which contained an ``AWL table.'') 
We agree to add the airplane applicability to paragraph (g) of this AD 
because AWL No. 28-AWL-03 only applies to airplanes on which certain 
design changes have been incorporated. We have revised paragraph (g) of 
this AD accordingly.

Request To Clarify Need for AMOCs

    The ATA, on behalf of its member U.S. Airways, requests that we 
clarify whether operators must obtain AMOCs for AWLs that are not 
applicable to their airplanes. U.S. Airways also requests that we 
clarify that some of the items identified in Appendix 2 of the NPRM 
might not be applicable to all Model 737-300, -400, and -500 series 
airplanes. U.S. Airways states that it will not be able to comply with 
certain AWL inspections or CDCCLs because it has not incorporated the 
relevant service bulletins identified in Revision May 2006 of Document 
D6-38278-CMR on several of its airplanes.
    Document D6-38278-CMR contains an applicability column that 
identifies the airplane configuration to which the AWL applies. The AWL 
is required only for those airplanes that have that configuration. If 
the applicability column identifies a service bulletin, then the 
operator would not need to adhere to the AWL until the airplane is 
modified in accordance with that service bulletin. There is no need to 
obtain an AMOC for airplanes that have not been modified. We agree that 
some of the items identified in Appendix 2 of the NPRM might not be 
applicable to all Model 737-300, -400, and -500 series airplanes. 
However, no change to this AD is necessary in this regard, since we 
have deleted Appendix 2 from this AD.

Request To Clarify if Latest Revision of Document D6-38278-CMR is 
Required

    The ATA, on behalf of its member U.S. Airways, requests that we 
clarify whether the latest revision of Document D6-38278-CMR will be 
incorporated into the final rule. The commenters note that Boeing has 
published a later revision of Document D6-38278-CMR than the one 
referenced in the NPRM.
    We have revised this AD to refer to the latest revision of Document 
D6-38278-CMR because paragraphs (g) and (h) of this AD allow the use of 
later approved revisions of that document. That document has been 
revised since then to include additional AWLs associated with the 
incorporation of certain design changes. As stated previously, we might 
require those design changes and associated AWLs with separate 
rulemaking actions, but operators may choose to incorporate the new 
AWLs before then.

Request To Clarify Revision Date of Document D6-38278-CMR

    The ATA, on behalf of its member U.S. Airways, notes that the 
``Changes to Fuel Tank System AWLs'' and ``Exceptional Short-Term 
Extensions'' sections of the NPRM refer to Revision March 2006 of 
Document D6-38278-CMR. U.S. Airways believes that the correct revision 
date should be May 2006 to match the rest of the NPRM.
    We infer the commenters request that we change the revision date to 
May 2006. We agree that the NPRM should have referred to Revision May 
2006 of Document D6-38278-CMR because that revision, and other later 
approved revisions, are the subject of this AD. Revision March 2006 of 
Document D6-38278-CMR was originally included in the NPRM because the 
AWLs for fuel tank systems were first incorporated in that document. 
However, we have not changed this AD since the paragraphs that the 
commenters refer to are not retained in the final rule.

Conclusion

    We reviewed the relevant data, considered the comments received, 
and determined that air safety and the public interest require adopting 
the AD with the changes described previously. We also determined that 
these changes will not increase the economic burden on any operator or 
increase the scope of the AD.

Costs of Compliance

    There are about 2,337 airplanes of the affected design in the 
worldwide fleet. 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 U.S.-
            Action               Work hours          Parts           Cost per       registered      Fleet cost
                                                                     airplane        airplanes
----------------------------------------------------------------------------------------------------------------
Maintenance program revision.               8  None.............            $640             672        $430,080
Inspection...................               8  None.............             640             672         430,080
----------------------------------------------------------------------------------------------------------------

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

[[Page 25973]]

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:

2008-10-09 Boeing: Amendment 39-15515. Docket No. FAA-2007-28383; 
Directorate Identifier 2006-NM-180-AD.

Effective Date

    (a) This airworthiness directive (AD) is effective June 12, 
2008.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to all Boeing Model 737-100, -200, -200C, -
300, -400, and -500 series airplanes, certificated in any category.

    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 a design review of the fuel tank 
systems. We are issuing this AD to prevent the potential for 
ignition sources inside fuel tanks caused by latent failures, 
alterations, repairs, or maintenance actions, which, in combination 
with flammable fuel vapors, could result in a fuel tank explosion 
and consequent loss of the airplane.

Compliance

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

Service Information Reference

    (f) The term ``Revision March 2008 of Document D6-38278-CMR,'' 
as used in this AD, means Boeing 737-100/200/200C/300/400/500 
Airworthiness Limitations (AWLs) and Certification Maintenance 
Requirements (CMRs), D6-38278-CMR, Revision March 2008.

Maintenance Program Revision

    (g) Before December 16, 2008, revise the FAA-approved 
maintenance program to incorporate the information specified in 
paragraph (g)(1) or (g)(2) of this AD, as applicable; except that 
the initial inspection required by paragraph (h) of this AD must be 
done at the applicable compliance time specified in that paragraph. 
Accomplishing the revision in accordance with a later revision of 
Document D6-38278-CMR is an acceptable method of compliance if the 
revision is approved by the Manager, Seattle Aircraft Certification 
Office (ACO), FAA.
    (1) For Model 737-100, -200, and -200C series airplanes: Section 
C, ``FUEL SYSTEMS AIRWORTHINESS LIMITATIONS,'' including AWLs No. 
28-AWL-01 through No. 28-AWL-20 inclusive, of Revision March 2008 of 
Document D6-38278-CMR. As an optional action, AWLs No. 28-AWL-21 
through No. 28-AWL-23 inclusive, as identified in Section C of 
Revision March 2008 of Document D6-38278-CMR, also may be 
incorporated into the FAA-approved maintenance program.
    (2) For Model 737-300, -400, and -500 series airplanes: Section 
C, ``FUEL SYSTEMS AIRWORTHINESS LIMITATIONS,'' including AWLs No. 
28-AWL-01 through No. 28-AWL-19 inclusive, Revision March 2008 of 
Document D6-38278-CMR. As an optional action, AWLs No. 28-AWL-20 
through No. 28-AWL-22 inclusive, as identified in Section C of 
Revision March 2008 of Document D6-38278-CMR, also may be 
incorporated into the FAA-approved maintenance program.

Initial Inspection and Repair if Necessary

    (h) For the airplanes identified in the ``Applicability'' column 
of AWL No. 28-AWL-03 of Section C of Revision March 2008 of Document 
D6-38278-CMR: At the later of the compliance times specified in 
paragraphs (h)(1) and (h)(2) of this AD, do a special detailed 
inspection of the lightning shield to ground termination on the out-
of-tank fuel quantity indication system (FQIS) wiring to verify 
functional integrity, in accordance with AWL No. 28-AWL-03 of 
Section C of Revision March 2008 of Document D6-38278-CMR. If any 
discrepancy is found during the inspection, repair the discrepancy 
before further flight in accordance with AWL No. 28-AWL-03 of 
Section C of Revision March 2008 of Document D6-38278-CMR. 
Accomplishing the actions required by this paragraph in accordance 
with a later revision of Document D6-38278-CMR is an acceptable 
method of compliance if the revision is approved by the Manager, 
Seattle ACO. Accomplishing AWL No. 28-AWL-03 as part of an FAA-
approved maintenance program before the applicable compliance time 
specified in paragraph (h)(1) or (h)(2) of this AD constitutes 
compliance with the requirements of this paragraph.

    Note 2: For the purposes of this AD, a special detailed 
inspection is: ``An intensive examination of a specific item, 
installation, or assembly to detect damage, failure, or 
irregularity. The examination is likely to make extensive use of 
specialized inspection techniques and/or equipment. Intricate 
cleaning and substantial access or disassembly procedure may be 
required.''

    (1) Within 120 months since the date of issuance of the original 
standard airworthiness certification or the date of issuance of the 
original export certificate of airworthiness.
    (2) Within 24 months after the effective date of this AD.

No Alternative Inspections, Inspection Intervals, or Critical Design 
Configuration Control Limitations (CDCCLs)

    (i) After accomplishing the actions specified in paragraphs (g) 
and (h) of this AD, no alternative inspections, inspection 
intervals, or CDCCLs may be used unless the inspections, intervals, 
or CDCCLs are part of a later revision of Revision March 2008 of 
Document D6-38278-CMR that is approved by the Manager, Seattle ACO; 
or unless the inspections, intervals, or CDCCLs are approved as an 
AMOC in accordance with the procedures specified in paragraph (k) of 
this AD.

Credit for Actions Done According to Previous Revisions of the Service 
Information

    (j) Actions done before the effective date of this AD in 
accordance with the Boeing 737-100/200/200C/300/400/500 
Airworthiness Limitations (AWLs) and Certification Maintenance 
Requirements (CMRs), D6-38278-CMR, Revision May 2006; Revision 
September 2006; or Revision November 2007; are acceptable for 
compliance with the corresponding requirements of paragraphs (g) and 
(h) of this AD.

Alternative Methods of Compliance (AMOCs)

    (k)(1) The Manager, Seattle ACO, has the authority to approve 
AMOCs for this AD, if requested in accordance with the procedures 
found in 14 CFR 39.19.

[[Page 25974]]

    (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 737-100/200/200C/300/400/500 
Airworthiness Limitations (AWLs) and Certification Maintenance 
Requirements (CMRs), D6-38278-CMR, Revision March 2008, 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: http://www.archives.gov/federal_register/code_of_federal_
regulations/ibr_locations.html.

    Issued in Renton, Washington, on April 29, 2008.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
 [FR Doc. E8-9922 Filed 5-7-08; 8:45 am]

BILLING CODE 4910-13-P