Rule2024-23116
Airworthiness Directives; The Boeing Company Airplanes
Primary source
Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.
Published
October 8, 2024
Effective
November 12, 2024
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is superseding Airworthiness Directive (AD) 2009-01- 02, which applied to certain Boeing Model 737-600, -700, -700C, -800, and -900 series airplanes. AD 2009-01-02 required an inspection of frames between body station (BS) 360 and BS 907 to determine if certain support brackets of the air conditioning (A/C) outlet extrusions are installed, inspections for cracking of the frames around the attachment holes of the subject brackets, and repair if necessary. AD 2009-01-02 also requires installing new, improved fittings for all support brackets of the A/C outlet extrusions between BS 360 and BS 907. This AD was prompted by numerous reports of multiple cracks in the frame around the attachment holes of the support bracket of the A/C outlet extrusion, and the determination that certain repairs might develop fatigue cracks that could result in the inability of the frame to sustain limit load and therefore must be inspected. This AD would continue to require the actions specified in AD 2009-01-02 and would also require repetitive inspections for cracking of certain repairs, and repair if necessary. The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 89 Issue 195 (Tuesday, October 8, 2024)</title>
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[Federal Register Volume 89, Number 195 (Tuesday, October 8, 2024)]
[Rules and Regulations]
[Pages 81320-81324]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2024-23116]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2023-1886; Project Identifier AD-2023-00429-T;
Amendment 39-22841; AD 2024-18-07]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2009-01-
02, which applied to certain Boeing Model 737-600, -700, -700C, -800,
and -900 series airplanes. AD 2009-01-02 required an inspection of
frames between body station (BS) 360 and BS 907 to determine if certain
support brackets of the air conditioning (A/C) outlet extrusions are
installed, inspections for cracking of the frames around the attachment
holes of the subject brackets, and repair if necessary. AD 2009-01-02
also requires installing new, improved fittings for all support
brackets of the A/C outlet extrusions between BS 360 and BS 907. This
AD was prompted by numerous reports of multiple cracks in the frame
around the attachment holes of the support bracket of the A/C outlet
extrusion, and the determination that certain repairs might develop
fatigue cracks that could result in the inability of the frame to
sustain limit load and therefore must be inspected. This AD would
continue to require the actions specified in AD 2009-01-02 and would
also require repetitive inspections for cracking of certain repairs,
and repair if necessary. The FAA is issuing this AD to address the
unsafe condition on these products.
DATES: This AD is effective November 12, 2024.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of November 12,
2024.
The Director of the Federal Register approved the incorporation by
reference of a certain other publication listed in this AD as of
February 27, 2009 (74 FR 4117, January 23, 2009).
ADDRESSES:
AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2023-1886; or in person at Docket Operations between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD
docket contains this final rule, any comments received, and other
information. The address for Docket Operations is U.S. Department of
Transportation, Docket Operations, M-30, West Building Ground Floor,
Room W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590.
Material Incorporated by Reference:
<bullet> For Boeing material identified in this AD, contact Boeing
Commercial Airplanes, Attention: Contractual & Data Services (C&DS),
2600 Westminster Blvd., MC 110 SK57, Seal Beach, CA 90740-5600;
telephone 562-797-1717; website <a href="http://myboeingfleet.com">myboeingfleet.com</a>.
<bullet> You may view this material at the FAA, Airworthiness
Products Section, Operational Safety Branch, 2200 South 216th St., Des
Moines, WA. For information on the availability of this material at the
FAA, call 206-231-3195. It is also available at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2023-1886.
FOR FURTHER INFORMATION CONTACT: Owen F. Bley-Male, Aviation Safety
Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone:
206-231-3992; email: <a href="/cdn-cgi/l/email-protection#c28db5a7acec84ec80aea7bbef8fa3aea782a4a3a3eca5adb4"><span class="__cf_email__" data-cfemail="ace3dbc9c282ea82eec0c9d581e1cdc0c9eccacdcd82cbc3da">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Background
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 to supersede AD 2009-01-02, Amendment 39-15780 (74 FR 4117,
January 23, 2009) (AD 2009-01-02). AD 2009-01-02 applied to certain
Boeing Model 737-600, -700, -700C, -800, and -900 series airplanes. The
NPRM published in the Federal Register on September 25, 2023 (88 FR
65637). The NPRM was prompted by numerous reports of multiple cracks in
the frame around the attachment holes of the support bracket of the A/C
outlet extrusion and the determination that certain repairs might
develop fatigue cracks that could result in the inability of the frame
to sustain limit load and therefore must be inspected. In the NPRM, the
FAA proposed to continue to require a one-time general visual
inspection of frames between BS 360 and BS 907 to determine if certain
support brackets of the A/C outlet extrusions are installed; medium-
and high-frequency eddy current inspections for cracking of the frames
around the attachment holes of the subject brackets; repair if
necessary; and installation of new, improved fittings for all support
brackets of the A/C outlet extrusions between BS 360 and BS 907. The
NPRM also proposed to require repetitive inspections for cracking of
certain repairs, and repair if necessary. The FAA is issuing this AD to
prevent frame
[[Page 81321]]
cracking, which, if not corrected, could lead to a severed frame that,
combined with cracking of the chemically milled steps in the skin above
the Stringer 10 lap splice, could result in rapid decompression of the
airplane.
Discussion of Final Airworthiness Directive
Comments
The FAA received a comment from an individual who supported the
NPRM without change.
The FAA received additional comments from Aviation Partners Boeing,
The Boeing Company (Boeing), Southwest Airlines (SWA), United Airlines
(UAL), and an individual. The following presents the comments received
on the NPRM and the FAA's response to each comment.
Request To Determine Estimated Cost
An individual commented that the NPRM stated that there is no
definitive data on which to estimate the labor cost (for the repairs),
so the basis for this estimated cost is unclear. The commenter
suggested an estimate using cost data for operations similar to those
required by this AD, making estimates more robust.
The FAA cannot pre-determine on-condition actions before the
inspections required by this AD are actually completed. The work-hours
to complete repairs will be unique to each airplane. For the other
actions required by this AD, the FAA used estimated costs that were
provided by the design approval holder. No changes have been made to
this AD in this regard.
Effect of Winglets on Accomplishment of the Proposed Actions
Aviation Partners Boeing stated that incorporation of Supplemental
Type Certificate (STC) ST00830SE for installation of blended or split
scimitar winglets does not affect the accomplishment of the
manufacturer's service instructions.
The FAA agrees with the commenter that STC ST00830SE does not
affect the accomplishment of the manufacturer's service instructions.
Therefore, the installation of STC ST00830SE does not affect the
ability to accomplish the actions required by this AD. The FAA has not
changed this AD in this regard.
Request for Correction of the Skin Lap Splice Location
Boeing stated that the NPRM incorrectly identified the location of
the skin lap splice. The NPRM referred to ``cracking of the skin lap
splice above stringer 10.'' Boeing requested that language be corrected
to ``cracking of the chemically milled steps in the skin above Stringer
10 lap splice'' to match the language in Boeing Alert Service Bulletin
737-25A1544, Revision 4, dated February 15, 2022.
The FAA agrees with the request and has revised the ``Background''
section of this final rule and the ``Unsafe Condition'' in paragraph
(e) of this AD accordingly.
Request To Add a General Visual Inspection for Cracks
Boeing noted that Boeing Alert Service Bulletin 737-25A1544,
Revision 4, dated February 15, 2022, requires a general visual
inspection (GVI) to detect cracks, not just to determine if certain
support brackets of the A/C outlet extrusions are installed at certain
frames. Boeing requested that a GVI be required to also detect cracks.
The FAA agrees with the request. The inspections specified in Part
2 of Boeing Alert Service Bulletin 737-25A1544, Revision 4, dated
February 15, 2022, include a GVI to detect cracks. The ``Material
Incorporated by Reference under 1 CFR part 51'' section of this final
rule and paragraph (g)(2) of this AD have been revised to include a GVI
as an inspection method.
Request To Revise the Applicability Statement
Boeing stated that paragraph (c), ``Applicability,'' of the
proposed AD incorrectly identified the referenced service information
as Boeing ``Special Attention'' Service Bulletin 737-25A1544, Revision
4, dated February 15, 2022, and explained that Revision 4 of this
service information is an ``alert'' service bulletin. The correct
reference is Boeing Alert Service Bulletin 737-25A1544, Revision 4,
dated February 15, 2022.
The FAA agrees and has revised paragraph (c) of this AD
accordingly.
Request To Correct Special Attention Service Bulletin
Boeing stated that a certain Boeing special attention service
bulletin is incorrectly identified under ``Actions Since AD 2009-01-02
Was Issued'' of the NPRM. Boeing pointed out that the NPRM incorrectly
identified the service bulletin number as ``737-25A1544.'' The correct
service bulletin number is ``737-25-1544.''
The FAA partially agrees. The FAA agrees that the specified service
bulletin number was stated incorrectly in the NPRM. However, since that
section of the NPRM is not restated in this final rule, no change is
necessary in this regard.
Request To Revise AMOC Provisions
SWA stated that paragraph (j) of the proposed AD requires
inspection of repairs installed on the BS 907 frame at the compliance
times given in Table 2 of Boeing Alert Service Bulletin 737-25A1544,
Revision 4, dated February 15, 2022. SWA mentioned that Table 2
requires post-repair inspections for repairs that were installed per
Boeing Special Attention Service Bulletin 737-25-1544, Revision 3,
dated May 16, 2016; or Boeing Alert Service Bulletin 737-25A1544,
Revision 4, dated February 15, 2022; and does not address repairs that
were installed by any other means. SWA proposed revising paragraph
(m)(4) of the proposed AD to extend alternative method of compliance
(AMOC) approval to paragraph (j) of the proposed AD, provided the AMOC
approval contains a damage tolerance evaluation. SWA believes that
individually approved repairs that contain an AMOC to AD 2009-01-02,
with a damage tolerance analysis as a Category A or Category B repair
(as defined in Boeing SRM 51-00-06), provide an equivalent level of
safety.
The FAA disagrees with the request. Only repairs installed per
Boeing Special Attention Service Bulletin 737-25-1544, Revision 3,
dated May 16, 2016; or Boeing Alert Service Bulletin 737-25A1544,
Revision 4, dated February 15, 2022; are subject to the requirements of
paragraph (j) of this AD. Repairs installed by any other means are not
subject to the requirements of paragraph (j) of this AD, so the
proposed AMOC to paragraph (j) would not be applicable. The FAA has not
changed this AD in this regard.
Request To Clarify Airplanes Affected by New Requirements
UAL supported the NPRM, and requested clarification of the
airplanes affected by paragraph (j) of the proposed AD. UAL stated that
some airplanes had repairs to the STA 907 frame performed before
release of Boeing Special Attention Service Bulletin 737-25-1544,
Revision 3, dated May 16, 2016. UAL added that these repairs were
coordinated with Boeing and received Form 8100-9 approvals as AMOCs to
paragraph (g) of AD 2009-01-02 and are considered Category B damage
tolerance repairs that also require additional inspections as defined
in the 8100-9 approval. UAL stated that Table 2 of the ``Compliance''
paragraph of Boeing Alert Service Bulletin 737-25A1544, Revision 4,
dated February 15, 2022 (as specified in paragraph (j) of the proposed
AD), applies only to airplanes
[[Page 81322]]
on which a frame repair has been done at STA 907 in accordance with
Boeing Special Attention Service Bulletin 737-25-1544, Revision 3,
dated May 16, 2016; or Boeing Alert Service Bulletin 737-25-1544,
Revision 4, dated February 15, 2022. UAL therefore stated that Category
B repairs via Form 8100-9 should be excluded from paragraph (j) of the
proposed AD.
The FAA provides the following clarification. As stated previously,
only repairs installed per Boeing Special Attention Service Bulletin
737-25-1544, Revision 3, dated May 16, 2016; or Boeing Alert Service
Bulletin 747-25A1544, Revision 4, dated February 15, 2022; are subject
to the requirements of paragraph (j) of this AD. Repairs installed by
any other means are not subject to the requirements of paragraph (j) of
this AD. Therefore, no change to this AD is necessary.
Conclusion
The FAA reviewed the relevant data, considered any comments
received, and determined that air safety requires adopting this AD as
proposed. Accordingly, the FAA is issuing this AD to address the unsafe
condition on these products. Except for minor editorial changes, and
any other changes described previously, this AD is adopted as proposed
in the NPRM. None of the changes will increase the economic burden on
any operator.
Material Incorporated by Reference Under 1 CFR Part 51
The FAA reviewed Boeing Alert Service Bulletin 737-25A1544,
Revision 4, dated February 15, 2022. This material specifies procedures
for a one-time general visual inspection of frames between BS 360 and
BS 907 to determine if certain support brackets of the A/C outlet
extrusions are installed; a general visual inspection and low-, medium-
, and high-frequency eddy current inspections for cracking of the
frames around the attachment holes of the subject brackets, and repair
if necessary; and installation of new, improved fittings for all
support brackets of the A/C outlet extrusions between BS 360 and BS
907. This material also specifies procedures for repetitive detailed
and high-frequency eddy current inspections for cracking of certain
repairs at BS 907 and repair if necessary.
This AD also requires Boeing Special Attention Service Bulletin
737-25-1544, Revision 1, dated January 16, 2008, which the Director of
the Federal Register approved for incorporation by reference as of
February 27, 2009 (74 FR 4117, January 23, 2009).
This material is reasonably available because the interested
parties have access to it through their normal course of business or by
the means identified in ADDRESSES.
Costs of Compliance
The FAA estimates that this AD affects 738 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
Estimated Costs
--------------------------------------------------------------------------------------------------------------------------------------------------------
Action Labor cost Parts cost Cost per product Cost on U.S. operators
--------------------------------------------------------------------------------------------------------------------------------------------------------
General visual inspection (retained 1 work-hour x $85 per $0......................... $85........................... $62,730.
actions from AD hour = $85.
2009[dash]01[dash]02).
Eddy current inspections (retained Up to 216 work-hours x $0......................... Up to $18,360................. Up to $13,549,680.
actions from AD $85 per hour = Up to
2009[dash]01[dash]02). $18,360.
Replace support fittings (retained Up to 346 work-hours x Up to $28,789.............. Up to $58,199................. Up to $42,950,862.
actions from AD 2009-01-02). $85 per hour = Up to
$29,410.
Post-repair inspections (new 42 work-hours x $85 $0......................... $3,570 per inspection cycle... $2,634,660 per inspection
action). per hour = $3,570 per cycle.
inspection cycle.
--------------------------------------------------------------------------------------------------------------------------------------------------------
The FAA has received no definitive data on which to base the cost
estimates for the on-condition repairs that would be required based on
the results of the inspections specified in 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.
The FAA is issuing this rulemaking under the authority described in
Subtitle VII, Part A, Subpart III, Section 44701: General requirements.
Under that section, Congress charges the FAA with promoting safe flight
of civil aircraft in air commerce by prescribing regulations for
practices, methods, and procedures the Administrator finds necessary
for safety in air commerce. This regulation is within the scope of that
authority because it addresses an unsafe condition that is likely to
exist or develop on products identified in this rulemaking action.
Regulatory Findings
This AD will not have federalism implications under Executive Order
13132. This AD will not have a substantial direct effect on the States,
on the relationship between the national government and the States, or
on the distribution of power and responsibilities among the various
levels of government.
For the reasons discussed above, I certify that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Will not affect intrastate aviation in Alaska, and
(3) Will not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
The Amendment
Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39--AIRWORTHINESS DIRECTIVES
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:
0
a. Removing Airworthiness Directive (AD) 2009-01-02, Amendment 39-15780
(74 FR 4117, January 23, 2009); and
0
b. Adding the following new AD:
2024-18-07 The Boeing Company: Amendment 39-22841; Docket No.
[[Page 81323]]
FAA-2023-1886; Project Identifier AD-2023-00429-T.
(a) Effective Date
This airworthiness directive (AD) is effective November 12,
2024.
(b) Affected ADs
This AD replaces AD 2009-01-02, Amendment 39-15780 (74 FR 4117,
January 23, 2009) (AD 2009-01-02).
(c) Applicability
This AD applies to Boeing Model 737-600, -700, -700C, -800, and
-900 series airplanes, certificated in any category, as identified
in Boeing Alert Service Bulletin 737-25A1544, Revision 4, dated
February 15, 2022.
(d) Subject
Air Transport Association (ATA) of America Code 25, Equipment/
Furnishing.
(e) Unsafe Condition
This AD was prompted by numerous reports of multiple cracks in
the frame around the attachment holes of the support bracket of the
air conditioning (A/C) outlet extrusion. Also, the FAA determined
that certain repairs done to comply with AD 2009-01-02 might develop
fatigue cracks that could result in the inability of the frame to
sustain limit load and must be inspected. The FAA is issuing this AD
to address frame cracking, which, if not corrected, could lead to a
severed frame that, combined with cracking of the chemically milled
steps in the skin above the Stringer 10 lap splice, could result in
rapid decompression of the airplane.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Retained Inspection, With New Material
This paragraph restates the requirements of paragraph (f) of AD
2009-01-02, with new material. Before the accumulation of 36,000
total flight cycles, or within 72 months after February 27, 2009
(the effective date of AD 2009-01-02), whichever occurs later,
except as required by paragraph (i) of this AD: Do a general visual
inspection to determine if the support brackets of the A/C outlet
extrusions between body station (BS) 360 and BS 907 have two-rivet
attachment fittings in accordance with Part 2 of the Accomplishment
Instructions of Boeing Special Attention Service Bulletin 737-25-
1544, Revision 1, dated January 16, 2008, or Boeing Alert Service
Bulletin 737-25A1544, Revision 4, dated February 15, 2022; except at
the locations identified in the notes of Step 3.B.1 of Part 1 of the
Accomplishment Instructions of Boeing Special Attention Service
Bulletin 737-25-1544, Revision 1, dated January 16, 2008, or Boeing
Alert Service Bulletin 737-25A1544, Revision 4, dated February 15,
2022. As of the effective date of this AD, only use Boeing Alert
Service Bulletin 737-25A1544, Revision 4, dated February 15, 2022,
for the actions required by paragraph (g) of this AD.
(1) For any support bracket attached with three or more rivets:
No further action is required by paragraph (g) of this AD.
(2) For any subject support bracket having a two-rivet
attachment fitting: Before the accumulation of 36,000 total flight
cycles, or within 72 months after February 27, 2009 (the effective
date of AD 2009-01-02), whichever occurs later, except as required
by paragraph (i) of this AD, do general visual, medium- and high-
frequency eddy current inspections for cracking of the frame around
the attachment holes of the support bracket, in accordance with Part
2 of the Accomplishment Instructions of Boeing Special Attention
Service Bulletin 737-25-1544, Revision 1, dated January 16, 2008, or
do general visual, low-, medium- and high-frequency eddy current
inspections for cracking of the frame around the attachment holes of
the support bracket, in accordance with Part 2 of the Accomplishment
Instructions of Boeing Alert Service Bulletin 737-25A1544, Revision
4, dated February 15, 2022. If any cracking is discovered, before
further flight, repair the cracking in accordance with Part 3 of the
Accomplishment Instructions of Boeing Special Attention Service
Bulletin 737-25-1544, Revision 1, dated January 16, 2008, or Boeing
Alert Service Bulletin 737-25A1544, Revision 4, dated February 15,
2022, except as required by paragraph (k)(2) of this AD. As of the
effective date of this AD, only use Boeing Alert Service Bulletin
737-25A1544, Revision 4, dated February 15, 2022, for the actions
required by paragraph (g)(2) of this AD.
(h) Retained Modification, With New Material
This paragraph restates the requirements of paragraph (g) of AD
2009-01-02, with new material. Except as required by paragraph (i)
of this AD: Before the accumulation of 36,000 total flight cycles,
or within 72 months after February 27, 2009 (the effective date of
AD 2009-01-02), whichever occurs later, replace the support fittings
of all A/C outlet extrusions between BS 360 and BS 907 with new,
improved support fittings, in accordance with Part 4 of the
Accomplishment Instructions of Boeing Special Attention Service
Bulletin 737-25-1544, Revision 1, dated January 16, 2008, or Boeing
Alert Service Bulletin 737-25A1544, Revision 4, dated February 15,
2022. As of the effective date of this AD, only use Boeing Alert
Service Bulletin 737-25A1544, Revision 4, dated February 15, 2022,
for the actions required by paragraph (h) of this AD.
(i) Retained Compliance Time for Certain Airplanes, With No Changes
This paragraph restates the compliance time specified in
paragraph (h) of AD 2009-01-02, with no changes. For airplanes on
which Boeing Business Jet (BBJ) lower cabin altitude modification is
incorporated in accordance with Supplemental Type Certificate (STC)
ST01697SE (6,500 feet maximum cabin altitude in lieu of 8,000 feet):
Before the accumulation of 18,000 total flight cycles, or within 72
months after February 27, 2009 (the effective date of AD 2009-01-
02), whichever occurs later, do the actions specified in paragraphs
(g) and (h) of this AD.
(j) New Requirements of This AD
For Groups 1 through 4 and Group 6 as identified in Boeing Alert
Service Bulletin 737-25A1544, Revision 4, dated February 15, 2022:
Except as specified in paragraph (k) of this AD: At the applicable
time specified in Table 2 of the ``Compliance'' paragraph of Boeing
Alert Service Bulletin 737-25A1544, Revision 4, dated February 15,
2022, do a detailed inspection and a high-frequency eddy current
inspection for cracking of the repaired area at frame BS 907, and do
all applicable repairs before further flight, in accordance with the
Accomplishment Instructions of Boeing Alert Service Bulletin 737-
25A1544, Revision 4, dated February 15, 2022. Repeat the inspections
thereafter at the applicable time specified in Table 2 of the
``Compliance'' paragraph of Boeing Alert Service Bulletin 737-
25A1544, Revision 4, dated February 15, 2022.
(k) Exceptions to Service Bulletin Specifications
(1) Where the Compliance Time column of Table 2 in the
``Compliance'' paragraph of Boeing Alert Service Bulletin 737-
25A1544, Revision 4, dated February 15, 2022, uses the phrase ``the
Revision 4 date of this Service Bulletin,'' this AD requires using
``the effective date of this AD.''
(2) Where Boeing Alert Service Bulletin 737-25A1544, Revision 4,
dated February 15, 2022, specifies contacting Boeing, this AD
requires repair before further flight using a method approved in
accordance with the procedures specified in paragraph (m) of this
AD.
(3) For airplanes on which BBJ Lower Cabin Altitude STC
ST01697SE (<a href="http://drs.faa.gov/browse/excelExternalWindow/0812969A86AF879B8625766400600105.0001">drs.faa.gov/browse/excelExternalWindow/0812969A86AF879B8625766400600105.0001</a>) has been incorporated, the
flight-cycle related compliance times for the inspections required
by paragraph (j) of this AD are different from those specified in
Table 2 of the ``Compliance'' paragraph in Boeing Alert Service
Bulletin 737-25A1544, Revision 4, dated February 15, 2022. All
initial compliance times specified in total flight cycles or flight
cycles must be reduced to half of those specified in Table 2 of the
``Compliance'' paragraph in Boeing Alert Service Bulletin 737-
25A1544, Revision 4, dated February 15, 2022. All repetitive
interval compliance times specified in flight cycles must be reduced
to one-quarter of those specified in Table 2 of the ``Compliance''
paragraph in Boeing Alert Service Bulletin 737-25A1544, Revision 4,
dated February 15, 2022.
(l) Credit for Previous Actions
(1) This paragraph provides credit for the actions specified in
paragraphs (g) and (h) of this AD, if those actions were performed
before February 27, 2009 (the effective date of AD 2009-01-02),
using Boeing Special Attention Service Bulletin 737-25-1544, dated
October 4, 2006.
(2) This paragraph provides credit for the actions specified in
paragraphs (g) and (h) of this AD, if those actions were performed
before the effective date of this AD using Boeing Special Attention
Service Bulletin 737-25-1544, Revision 2, dated March 23,
[[Page 81324]]
2011; or Boeing Special Attention Service Bulletin 737-25-1544,
Revision 3, dated May 16, 2016.
(m) Alternative Methods of Compliance (AMOCs)
(1) The Manager, AIR-520, Continued Operational Safety Branch,
FAA, has the authority to approve AMOCs for this AD, if requested
using the procedures found in 14 CFR 39.19. In accordance with 14
CFR 39.19, send your request to your principal inspector or
responsible Flight Standards Office, as appropriate. If sending
information directly to the manager of AIR-520, Continued
Operational Safety Branch, send it to the attention of the person
identified in paragraph (n)(1) of this AD. Information may be
emailed to: <a href="/cdn-cgi/l/email-protection#d2939f9d9192b4b3b3fcb5bda4"><span class="__cf_email__" data-cfemail="17565a58545771767639707861">[email protected]</span></a>.
(2) Before using any approved AMOC, notify your appropriate
principal inspector, or lacking a principal inspector, the manager
of the responsible Flight Standards Office.
(3) An AMOC that provides an acceptable level of safety may be
used for any repair, modification, or alteration required by this AD
if it is approved by The Boeing Company Organization Designation
Authorization (ODA) that has been authorized by the Manager, AIR-
520, Continued Operational Safety Branch, FAA, to make those
findings. To be approved, the repair method, modification deviation,
or alteration deviation must meet the certification basis of the
airplane, and the approval must specifically refer to this AD.
(4) AMOCs approved for AD 2009-01-02 are approved as AMOCs for
the corresponding provisions of this AD.
(n) Related Information
(1) For more information about this AD, contact Owen F. Bley-
Male, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des
Moines, WA 98198; phone: 206-231-3992; email: <a href="/cdn-cgi/l/email-protection#450a32202b6b036b0729203c6808242920052324246b222a33"><span class="__cf_email__" data-cfemail="a4ebd3c1ca8ae28ae6c8c1dd89e9c5c8c1e4c2c5c58ac3cbd2">[email protected]</span></a>.
(2) Material identified in this AD that is not incorporated by
reference is available at the address specified in paragraph (o)(5)
of this AD.
(o) Material Incorporated by Reference
(1) The Director of the Federal Register approved the
incorporation by reference (IBR) of the material listed in this
paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) You must use this material as applicable to do the actions
required by this AD, unless this AD specifies otherwise.
(3) The following material was approved for IBR on November 12,
2024.
(i) Boeing Alert Service Bulletin 737-25A1544, Revision 4, dated
February 15, 2022.
(ii) [Reserved]
(4) The following material was approved for IBR on February 27,
2009 (74 FR 4117, January 23, 2009).
(i) Boeing Special Attention Service Bulletin 737-25-1544,
Revision 1, dated January 16, 2008.
(ii) [Reserved]
(5) For Boeing material identified in this AD, contact Boeing
Commercial Airplanes, Attention: Contractual & Data Services (C&DS),
2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 90740-5600;
telephone 562-797-1717; website <a href="http://myboeingfleet.com">myboeingfleet.com</a>.
(6) You may view this material at the FAA, Airworthiness
Products Section, Operational Safety Branch, 2200 South 216th St.,
Des Moines, WA. For information on the availability of this material
at the FAA, call 206-231-3195.
(7) You may view this material at the National Archives and
Records Administration (NARA). For information on the availability
of this material at NARA, visit <a href="http://www.archives.gov/federal-register/cfr/ibr-locations">www.archives.gov/federal-register/cfr/ibr-locations</a> or email <a href="/cdn-cgi/l/email-protection#accade82c5c2dfdcc9cfd8c5c3c2ecc2cddecd82cbc3da"><span class="__cf_email__" data-cfemail="e68094c88f8895968385928f8988a688879487c8818990">[email protected]</span></a>.
Issued on September 6, 2024.
Peter A. White,
Deputy Director, Integrated Certificate Management Division, Aircraft
Certification Service.
[FR Doc. 2024-23116 Filed 10-7-24; 8:45 am]
BILLING CODE 4910-13-P
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</html>Indexed from Federal Register on October 8, 2024.
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