Report of inspections Required by Airworthiness Directives, Part 39

[Federal Register: April 26, 2010 (Volume 75, Number 79)]
[Rules and Regulations]
[Page 21499-21503]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr26ap10-1]
––––––––––––––––––––––––––––––––––
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2010-0430; Directorate Identifier 2010-NM-098-AD; Amendment 39-16270;
AD 2010-09-05]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Model 737-600, -700, -700C, -800, -900, and 900ER Series Airplanes
AGENCY: Federal Aviation Administration (FAA), Department of Transportation (DOT).
ACTION: Final rule; request for comments.
––––––––––––––––––––––––––––––––––
SUMMARY: The FAA is superseding an existing airworthiness directive (AD) that applies to all
The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. The
existing AD currently requires doing a detailed inspection of the inboard and outboard aft attach lugs
of the left and right elevator control tab mechanisms for gaps between the swage ring and the aft
attach lug, and between the spacer and the aft attach lug; trying to move or rotate the spacer using
hand pressure; and replacing any discrepant elevator tab control mechanism, including performing
the detailed inspection on the replacement part before and after installation. For certain airplanes, this
new AD adds improved repetitive inspections for discrepancies of the inboard and outboard aft attach
lugs of the left and right elevator control tab mechanisms, and replacement if necessary. For certain
other airplanes, this new AD adds a one-time inspection for discrepancies of the inboard and
outboard aft attach lugs of the left and right elevator control tab mechanisms, and replacement if
necessary. For airplanes on which the elevator control tab mechanism is replaced with a certain
mechanism, this AD requires repetitive inspections for discrepancies of the elevator control tab
mechanism and replacement if necessary. Replacing the elevator control tab mechanism with a new,
Boeing-built mechanism terminates the repetitive inspections. This AD results from a report of
failure of the aft attach lugs on the left elevator tab control mechanism, which resulted in severe
elevator vibration; this event occurred on an airplane on which the existing AD had been done. We
are issuing this AD to detect and correct a loose bearing in the aft lug of the elevator tab control
mechanism, which could result in unwanted elevator and tab vibration. Consequent structural failure
of the elevator or horizontal stabilizer could result in loss of structural integrity and aircraft control.
DATES: This AD becomes effective April 29, 2010.
The Director of the Federal Register approved the incorporation by reference of a certain
publication listed in the AD as of April 29, 2010.
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On April 7, 2010 (75 FR 16648, April 2, 2010), the Director of the Federal Register approved the
incorporation by reference of a certain other publication listed in the AD.
We must receive any comments on this AD by June 10, 2010.
ADDRESSES: You may send comments by any of the following methods:
• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for
submitting comments.
• Fax: 202-493-2251.
• Mail: U.S. Department of Transportation, Docket Operations, M-30, West Building Ground
Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590.
• Hand Delivery: U.S. Department of Transportation, Docket Operations, M-30, West Building
Ground Floor, Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590,
between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays.
For service information identified in this AD, contact Boeing Commercial Airplanes, Attention:
Data & Services Management, P.O. Box 3707, MC 2H-65, Seattle, Washington 98124-2207;
telephone 206-544-5000, extension 1; fax 206-766-5680; e-mail [email protected]; Internet
https://www.myboeingfleet.com.
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: Kelly McGuckin, Aerospace Engineer, Systems
and Equipment Branch, ANM-130S, FAA, Seattle ACO, 1601 Lind Avenue, SW., Renton,
Washington 98057-3356; telephone (425) 917-6490; fax (425) 917-6590.
SUPPLEMENTARY INFORMATION:
Discussion
On March 18, 2010, we issued AD 2010-06-51, amendment 39-16250 (75 FR 16648, April 2,
2010). That AD applies to all The Boeing Company Model 737-600, -700, -700C, -800, -900, and 900ER series airplanes. That AD requires doing a detailed inspection of the inboard and outboard aft
attach lugs of the left and right elevator control tab mechanisms for gaps between the swage ring and
the aft attach lug, and between the spacer and the aft attach lug; trying to move or rotate the spacer
using hand pressure; and replacing any discrepant elevator tab control mechanism, including
performing the detailed inspection on the replacement part before and after installation. That AD
resulted from a report of failure of the aft attach lugs on the left elevator tab control mechanism,
which resulted in severe elevator vibration. The actions specified in that AD are intended to detect
and correct a loose bearing in the aft lug of the elevator tab control mechanism, which could result in
unwanted elevator and tab vibration. Consequent structural failure of the elevator or horizontal
stabilizer could result in loss of structural integrity and aircraft control.
Actions Since AD Was Issued
Since we issued that AD, we received an additional report of failure of the aft attach lugs on the
left elevator tab control mechanism. This event occurred on an airplane that had been inspected in
accordance with AD 2010-06-51. We have determined that an improved inspection is necessary to
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address the identified unsafe condition. We verified the inspection procedure with an operator prior to
approval of Boeing Alert Service Bulletin 737-27A1297, dated April 16, 2010.
Relevant Service Information
We have reviewed Boeing Alert Service Bulletin 737-27A1297, dated April 16, 2010. The
service bulletin describes procedures for Model 737-700, -700C, -800, and -900ER series airplanes,
line numbers 2508 through 3250 inclusive. The service bulletin specifies a one-time detailed
inspection (for all airplanes having line numbers 2708 through 3250 inclusive that are approved for
operation under ETOPS), and repetitive detailed inspections (for all airplanes having line numbers
2508 through 2707 inclusive) for discrepancies of the inboard and outboard aft attach lugs of the left
and right elevator control tab mechanisms, and replacing any discrepant mechanisms. The detailed
inspection includes the use of a feeler gage and finger pressure and instructs to apply hand pressure
during the inspection for gaps and looseness. Discrepancies include the following conditions:
• The spacer moves or rotates.
• Gap exists between the swage ring and the outer face of the aft attach lug such that a 0.005
inch feeler gage can be inserted more than 0.025 inch.
• Gap exists between two nested lugs such that a 0.005 inch feeler gage can be inserted more
than 0.050 inch.
• Gap exists between the inner face of the aft attach lug and the spacer such that a 0.005 inch
feeler gage can be inserted more than 0.050 inch.
The service bulletin also specifies that for airplanes on which the elevator control tab mechanism
is replaced with an elevator control tab mechanism that is not a Boeing-built mechanism, the
repetitive detailed inspections described above are necessary.
The service bulletin also specifies that replacing discrepant elevator control tab mechanisms with
Boeing-built elevator control tab mechanisms eliminates the need for the repetitive inspections.
FAA's Determination and Requirements of This AD
The unsafe condition described previously is likely to exist or develop on other airplanes of these
same type designs. For this reason, we are issuing this AD to supersede AD 2010-06-51. This new
AD retains the inspection requirements of AD 2010-06-51, and also requires, for certain airplanes,
accomplishing the actions specified in Boeing Alert Service Bulletin 737-27A1297, dated April 16,
2010, described previously, except as discussed under ''Differences Between the AD and Boeing
Alert Service Bulletin 737-27A1297.'' This new AD also requires sending the inspection results to the
manufacturer and sending discrepant elevator control tab mechanisms to the manufacturer.
Differences Between the AD and Boeing Alert Service Bulletin 737-27A1297
Boeing Alert Service Bulletin 737-27A1297, dated April 16, 2010, specifies that replacing
discrepant elevator control tab mechanisms with Boeing-built elevator control tab mechanisms
eliminates the need for the repetitive inspections. This AD specifies that installing only a new,
Boeing-built elevator control tab mechanism terminates the repetitive inspections. We have not
received sufficient data to demonstrate that repaired elevator control tab mechanisms were repaired
using procedures that will adequately address the identified unsafe condition. We find that only
allowing new Boeing elevator control tab mechanisms as terminating action, as specified by this AD,
will adequately address the unsafe condition. We have coordinated this issue with Boeing.
While Boeing Alert Service Bulletin 737-27A1297, dated April 16, 2010, does not identify
Model 737-600 and -900 series airplanes, this AD applies to those airplanes because they are subject
to the Parts Installation paragraph of this AD.

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Interim Action
This AD is considered to be interim action. The inspection reports and the returned discrepant
parts that are required by this AD will enable the airframe manufacturer and the FAA to obtain better
insight into the nature, cause, and extent of the issue, and eventually to develop final action to address
the unsafe condition. Once final action has been identified, we might consider further rulemaking.
FAA's Justification and Determination of the Effective Date
A loose bearing in the aft lug of the elevator tab control mechanism could result in unwanted
elevator and tab vibration. Consequent structural failure of the elevator or horizontal stabilizer could
result in loss of structural integrity and aircraft control. Because of our requirement to promote safe
flight of civil aircraft and thus the critical need to ensure the structural integrity of the airplane, 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-2010-0430; Directorate
Identifier 2010-NM-098-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 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
We have determined that 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.

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For the reasons discussed above, I certify that the regulation:
1. Is not a ''significant regulatory action'' under Executive Order 12866;
2. Is not a ''significant rule'' under the DOT Regulatory Policies and Procedures (44 FR 11034,
February 26, 1979); and
3. Will not have a significant economic impact, positive or negative, on a substantial number of
small entities under the criteria of the Regulatory Flexibility Act.
We prepared a regulatory evaluation of the estimated costs to comply with this AD and placed it
in the AD docket. See the ADDRESSES section for a location to examine the regulatory evaluation.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
Adoption of the Amendment
Accordingly, under the authority delegated to me by the Administrator, the FAA amends part 39 of
the Federal Aviation Regulations (14 CFR part 39) as follows:
PART 39–AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
§ 39.13 [Amended]
2. The Federal Aviation Administration (FAA) amends § 39.13 by removing amendment 39-16250
(75 FR 16648, April 2, 2010) and by adding the following new airworthiness directive (AD):

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AIRWORTHINESS DIRECTIVE
FAA
Aviation Safety

www.faa.gov/aircraft/safety/alerts/
www.gpoaccess.gov/fr/advanced.html

2010-09-05 The Boeing Company: Amendment 39-16270. Docket No. FAA-2010-0430;
Directorate Identifier 2010-NM-098-AD.
Effective Date
(a) This AD becomes effective April 29, 2010.
Affected ADs
(b) This AD supersedes AD 2010-06-51, Amendment 39-16250.
Applicability
(c) This AD applies to all The Boeing Company Model 737-600, -700, -700C, -800, -900, and 900ER series airplanes; certificated in any category.
Subject
(d) Air Transport Association (ATA) of America Code 27: Flight controls.
Unsafe Condition
(e) This AD results from a report of failure of the aft attach lugs on the left elevator tab control
mechanism, which resulted in severe elevator vibration; this event occurred on an airplane on which
the existing AD had been done. The Federal Aviation Administration is issuing this AD to detect and
correct a loose bearing in the aft lug of the elevator tab control mechanism, which could result in
unwanted elevator and tab vibration. Consequent structural failure of the elevator or horizontal
stabilizer could result in loss of structural integrity and aircraft control.
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.
Restatement of Requirements of AD 2010-06-51
Inspection and Corrective Action
(g) For Groups 1, 2, and 3; and Group 4, Configuration 2; as identified in Boeing Alert Service
Bulletin 737-27A1296, dated March 12, 2010: At the applicable time specified in paragraph 1.E.
Compliance of Boeing Alert Service Bulletin 737-27A1296, dated March 12, 2010, except as
required by paragraph (i) of this AD, do a detailed inspection of the inboard and outboard aft attach
lugs of the left and right elevator control tab mechanisms for gaps between the swage ring and the aft
attach lug, and between the spacer and the aft attach lug; and try to move or rotate the spacer using
hand pressure; in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin
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737-27A1296, dated March 12, 2010. Doing the inspection required by paragraph (m) or (o) of this
AD, as applicable, terminates the requirements of this paragraph.
(h) If, during accomplishment of the actions required by paragraph (g) of this AD, any gap is
found between the swage ring and the aft attach lug, or between the spacer and the aft attach lug; or if
the spacer moves or rotates: Before further flight, do the actions required by paragraphs (h)(1) and
(h)(2) of this AD, in accordance with the Accomplishment Instructions of Boeing Alert Service
Bulletin 737-27A1296, dated March 12, 2010.
(1) Inspect the replacement elevator tab control mechanism for discrepancies, as specified in
paragraph (g) of this AD; and, if no discrepancy is found, install the replacement elevator tab control
mechanism.
(2) Re-inspect the installed elevator tab control mechanism, as required by paragraph (g) of this
AD.
Exception to Service Bulletin Specifications
(i) Where Boeing Alert Service Bulletin 737-27A1296, dated March 12, 2010, specifies a
compliance time after the date of the original issue of the service bulletin, this AD requires
compliance within the specified compliance time after April 7, 2010 (the effective date of AD 201006-51).
Inspection Done According to Multi Operator Message (MOM)
(j) An inspection done before April 7, 2010, according to Boeing Multi Operator Message
Number MOM-MOM-10-0159-01B, dated March 10, 2010, is considered acceptable for compliance
with the corresponding inspection specified in paragraph (g) of this AD.
Reporting
(k) At the applicable time specified in paragraph (k)(1) or (k)(2) of this AD: Submit a report of
the findings (both positive and negative) of the inspections required by paragraph (g) of this AD to
Boeing Commercial Airplanes Group, Attention: Manager, Airline Support, e-mail:
[email protected]. The report must include the inspection results including a description of
any discrepancies found, the airplane line number, and the number of flight cycles and flight hours
accumulated on the airplane. Under the provisions of the Paperwork Reduction Act (44 U.S.C. 3501
et seq.), the Office of Management and Budget (OMB) has approved the information collection
requirements contained in this AD and has assigned OMB Control Number 2120-0056.
(1) If the inspection was done on or after April 7, 2010: Submit the report within 10 days after
the inspection.
(2) If the inspection was done before April 7, 2010: Submit the report within 10 days after April
7, 2010.
Parts Installation Specified in AD 2010-06-51
(l) For all airplanes: As of April 7, 2010, and until the effective date of this AD, no person may
install an elevator tab control mechanism, part number 251A2430-( ), on any airplane, unless the
mechanism has been inspected before and after installation, in accordance with the requirements of
paragraph (g) of this AD, and no discrepancies have been found. As of the effective date of this AD,
comply with paragraph (u) of this AD.

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New Requirements of This AD
Repetitive Inspections for Group 1 Airplanes, as Identified in Boeing Alert Service Bulletin
737-27A1297, Dated April 16, 2010
(m) For Group 1 airplanes, as identified in Boeing Alert Service Bulletin 737-27A1297, dated
April 16, 2010: Except as required by paragraph (n) of this AD, within 12 days after the effective
date of this AD, do a detailed inspection for discrepancies of the inboard and outboard aft attach lugs
of the left and right elevator control tab mechanisms, in accordance with the Accomplishment
Instructions of Boeing Alert Service Bulletin 737-27A1297, dated April 16, 2010. Repeat the
inspection thereafter at intervals not to exceed 300 flight hours until the replacement specified in
paragraph (r) of this AD is done. Doing the initial inspection required by this paragraph terminates
the requirements of paragraph (g) of this AD.
(n) For Group 1 airplanes as identified in Boeing Alert Service Bulletin 737-27A1297, dated
April 16, 2010: Beginning 7 days after the effective date of this AD, no person may operate an
airplane on an extended twin operations (ETOPS) flight unless the initial inspection required by
paragraph (m) of this AD has been accomplished.
One-Time Inspection for Group 2, Configuration 1 Airplanes, as Identified in Boeing Alert
Service Bulletin 737-27A1297, Dated April 16, 2010
(o) For Group 2, Configuration 1 airplanes as identified in Boeing Alert Service Bulletin 73727A1297, dated April 16, 2010: Within 30 days after the effective date of this AD, do a one-time
detailed inspection for discrepancies of the inboard and outboard aft attach lugs of the left and right
elevator control tab mechanisms, in accordance with the Accomplishment Instructions of Boeing
Alert Service Bulletin 737-27A1297, dated April 16, 2010. Doing the inspection required by this
paragraph terminates the requirements of paragraph (g) of this AD.
Corrective Actions
(p) If, during any inspection required by paragraph (m), (o), or (q) of this AD, any discrepancy is
found, before further flight, replace the elevator tab control mechanism by doing the actions specified
in paragraphs (p)(1) and (p)(2) of this AD.
(1) Do a detailed inspection for discrepancies of the replacement elevator tab control mechanism;
and, if no discrepancy is found, install the replacement elevator tab control mechanism; in accordance
with the Accomplishment Instructions of Boeing Alert Service Bulletin 737-27A1297, dated April
16, 2010. If any discrepancy is found, then that elevator tab control mechanism cannot be installed
and the actions specified in this paragraph must be done before further flight on another replacement
elevator tab control mechanism.
(2) Re-inspect the installed elevator tab control mechanism using the inspection procedure
specified in paragraph (o) of this AD.
Repetitive Inspections for Certain Group 2, Configuration 1 Airplanes, as Identified in Boeing
Alert Service Bulletin 737-27A1297, Dated April 16, 2010
(q) For Group 2, Configuration 1 airplanes as identified in Boeing Alert Service Bulletin 73727A1297, dated April 16, 2010, on which the elevator control tab mechanism is replaced with a
mechanism other than a new, Boeing-built mechanism: Within 300 flight hours after doing the
replacement, do a detailed inspection for discrepancies of the inboard and outboard aft attach lugs of
the left and right elevator control tab mechanisms, in accordance with the Accomplishment
Instructions of Boeing Alert Service Bulletin 737-27A1297, dated April 16, 2010. Repeat the
8

inspection thereafter at intervals not to exceed 300 flight hours until the replacement specified in
paragraph (r) of this AD is done.
Terminating Action
(r) Replacing an elevator tab mechanism with a new, Boeing-built mechanism, as specified in
paragraphs (r)(1) and (r)(2) of this AD, terminates the inspections required by paragraphs (m), (o),
and (q) of this AD.
Note 1: Refer to paragraphs 3.B.7.b.(1)(a)1) and 3.B.7.b.(1)(a)2) of the Accomplishment
Instructions of Boeing Alert Service Bulletin 737-27A1297, dated April 16, 2010, to establish
whether the mechanism is Boeing-built.
(1) Do a detailed inspection for discrepancies of the new, Boeing-built replacement elevator tab
control mechanism; and, if no discrepancy is found, install the replacement elevator tab control
mechanism; in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin
737-27A1297, dated April 16, 2010. If any discrepancy is found, then that elevator tab control
mechanism cannot be installed and the actions specified in this paragraph must be done on another
new, Boeing-built replacement elevator tab control mechanism.
(2) Re-inspect the installed elevator tab control mechanism using the inspection procedure
specified in paragraph (o) of this AD.
Reporting
(s) At the applicable time specified in paragraph (s)(1) or (s)(2) of this AD: Submit a report of
any findings (positive and negative) of the first inspection required by paragraphs (m), (o), and (q) of
this AD, and any positive findings from the repetitive inspections required by this AD, to Boeing
Commercial Airplanes Group, Attention: Manager, Airline Support, e-mail:
[email protected]. The report must include the inspection results including a description of
any discrepancies found, the airplane line number, and the total number of flight cycles and flight
hours accumulated on the airplane. Under the provisions of the Paperwork Reduction Act (44 U.S.C.
3501 et seq.), the Office of Management and Budget (OMB) has approved the information collection
requirements contained in this AD and has assigned OMB Control Number 2120-0056.
(1) If the inspection was done on or after the effective date of this AD: Submit the report within
10 days after the inspection.
(2) If the inspection was done before the effective date of this AD: Submit the report within 10
days after the effective date of this AD.
Return of Discrepant Parts
(t) If, during any inspection required by paragraph (m), (o), or (q) of this AD, any discrepancy is
found, and if the inspection was done on or after the effective date of this AD: Within 30 days after
the inspection, return the discrepant elevator tab control mechanism, and include a copy of the
inspection report sent to Boeing, as specified in paragraph (s) of this AD, to: Spares Distribution
Center, Attention: Manager, Airline Support, Repair Overhaul and Exchange Services, SSA 111,
Boeing Commercial Airplane Group, 2201 South 142nd Street, Door W10, Seatac, Washington,
USA, 98168.
Parts Installation
(u) For all airplanes identified in paragraph (c) of this AD: As of the effective date of this AD,
comply with the conditions specified in paragraphs (u)(1) and (u)(2) of this AD.
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(1) No person may install an elevator tab control mechanism, part number 251A2430-(), on any
airplane, unless the mechanism has been inspected before and after installation using the inspection
procedures specified in either paragraphs (p)(1) and (p)(2) of this AD, or in paragraphs (r)(1) and
(r)(2) of this AD; and no discrepancies have been found.
(2) An elevator tab control mechanism, part number 251A2430-(), that is not a new, Boeing-built
elevator tab control mechanism may be installed, provided that the mechanism is inspected using the
inspection procedures specified in paragraph (m) of this AD within 300 flight hours after doing the
installation, and that the inspection is repeated thereafter at the interval specified in paragraph (m) of
this AD.
Alternative Methods of Compliance (AMOCs)
(v)(1) The Manager, Seattle Aircraft Certification Office (ACO), 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: Kelly McGuckin, Aerospace Engineer, Systems and Equipment Branch, ANM130S, FAA, Seattle ACO, 1601 Lind Avenue SW., Renton, Washington 98057-3356; telephone 425917-6490; fax 425-917-6590. Information may be e-mailed to [email protected].
(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 refer to this AD.
(3) An AMOC that provides an acceptable level of safety may be used for any repair required by
this AD if it is approved by the Boeing Commercial Airplanes Organization Designation
Authorization (ODA) that has been authorized by the Manager, Seattle ACO, to make those findings.
For a repair method to be approved, the repair must meet the certification basis of the airplane, and
the approval must specifically refer to this AD.
(4) AMOCs approved previously in accordance with AD 2010-06-51 are approved as AMOCs
for the corresponding provisions of paragraph (g) or (l) of this AD.
Material Incorporated by Reference
(w) You must use Boeing Alert Service Bulletin 737-27A1296, dated March 12, 2010; or Boeing
Alert Service Bulletin 737-27A1297, dated April 16, 2010; as applicable, 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 Boeing Alert
Service Bulletin 737-27A1297, dated April 16, 2010, under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) The Director of the Federal Register previously approved the incorporation by reference of
Boeing Alert Service Bulletin 737-27A1296, dated March 12, 2010, on April 7, 2010 (75 FR 16648,
April 2, 2010).
(3) For service information identified in this AD, contact Boeing Commercial Airplanes,
Attention: Data & Services Management, P. O. Box 3707, MC 2H-65, Seattle, Washington 981242207; telephone 206-544-5000, extension 1; fax 206-766-5680; e-mail [email protected];
Internet https://www.myboeingfleet.com.
(4) 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.
(5) 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

10

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 19, 2010.
Ali Bahrami,
Manager, Transport Airplane Directorate,
Aircraft Certification Service.

11