Rule2022-12030
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
June 6, 2022
Effective
July 11, 2022
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-100B SUD, 747-200B, 747-200C, 747- 200F, 747-300, 747SP, 747-400, 747-400D, and 747-400F series airplanes. This AD was prompted by a determination that a certain fastener type that penetrates the fuel tank walls has insufficient bond to the structure, and energy from a lightning strike or high-powered short circuit could cause arcing to occur at the ends of fasteners in the fuel tanks. This AD requires, for certain airplanes, reconfiguring the clamps of certain wire bundles, applying sealant to certain fasteners that penetrate the fuel tank walls, installing cushion clamps and polytetrafluoroethylene (TFE) sleeves, inspecting to determine if sealant was applied to certain fasteners, and applying sealant if necessary. This AD also requires, for all airplanes, revising the maintenance or inspection program, as applicable, to incorporate new, more restrictive airworthiness limitations (AWLs). The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
<html>
<head>
<title>Federal Register, Volume 87 Issue 108 (Monday, June 6, 2022)</title>
</head>
<body><pre>
[Federal Register Volume 87, Number 108 (Monday, June 6, 2022)]
[Rules and Regulations]
[Pages 34120-34125]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2022-12030]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2021-0877; Project Identifier AD-2020-01316-T;
Amendment 39-22049; AD 2022-10-11]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
-----------------------------------------------------------------------
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain The Boeing Company Model 747-100B SUD, 747-200B, 747-200C, 747-
200F, 747-300, 747SP, 747-400, 747-400D, and 747-400F series airplanes.
This AD was prompted by a determination that a certain fastener type
that penetrates the fuel tank walls has insufficient bond to the
structure, and energy from a lightning strike or high-powered short
circuit could cause arcing to occur at the ends of fasteners in the
fuel tanks. This AD requires, for certain airplanes, reconfiguring the
clamps of certain wire bundles, applying sealant to certain fasteners
that penetrate the fuel tank walls, installing cushion clamps and
polytetrafluoroethylene (TFE) sleeves, inspecting to determine if
sealant was applied to certain fasteners, and
[[Page 34121]]
applying sealant if necessary. This AD also requires, for all
airplanes, revising the maintenance or inspection program, as
applicable, to incorporate new, more restrictive airworthiness
limitations (AWLs). The FAA is issuing this AD to address the unsafe
condition on these products.
DATES: This AD is effective July 11, 2022.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of July 11,
2022.
ADDRESSES: For service information identified in this final rule,
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; internet <a href="https://www.myboeingfleet.com">https://www.myboeingfleet.com</a>. You may view this service information 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="https://www.regulations.gov">https://www.regulations.gov</a> by searching for and locating Docket No.
FAA-2021-0877.
Examining the AD Docket
You may examine the AD docket at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by
searching for and locating Docket No. FAA-2021-0877; 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.
FOR FURTHER INFORMATION CONTACT: Rose Len, Aerospace Engineer,
Propulsion Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des
Moines, WA 98198; phone and fax: 206-231-3604; email: <a href="/cdn-cgi/l/email-protection#30425f43551e5c555e705651511e575f46"><span class="__cf_email__" data-cfemail="2f5d405c4a01434a416f494e4e01484059">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Background
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to certain The Boeing
Company Model 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300,
747SP, 747-400, 747-400D, and 747-400F series airplanes. The NPRM
published in the Federal Register on November 17, 2021 (86 FR 64085).
The NPRM was prompted by a determination that a certain fastener type
that penetrates the fuel tank walls has insufficient bond to the
structure, and energy from a lightning strike or high-powered short
circuit could cause arcing to occur at the ends of fasteners in the
fuel tanks. In the NPRM, the FAA proposed to require, for certain
airplanes, reconfiguring the clamps of certain wire bundles, applying
sealant to certain fasteners that penetrate the fuel tank walls,
installing cushion clamps and TFE sleeves, inspecting to determine if
sealant was applied to certain fasteners, and applying sealant if
necessary. In the NPRM, the FAA also proposed to require, for all
airplanes, revising the maintenance or inspection program, as
applicable, to incorporate new, more restrictive AWLs. The FAA is
issuing this AD to address arcing in the event of a lightning strike or
high-powered short circuit, which could result in a fuel tank explosion
or fire.
Discussion of Final Airworthiness Directive
Comments
The FAA received comments from two commenters, Air Line Pilots
Association, International (ALPA), and Boeing, who supported the NPRM
without change.
The FAA also received comments from United Parcel Service (UPS),
who supported the general actions in the NPRM and provided comments on
the AWLs and the inspections specified in the NPRM. The FAA also
received comments from Delta Air Lines (Delta). The following presents
the comments received on the NPRM and the FAA's response to each
comment.
Request To Change the NPRM to a Supersedure
Delta requested that the NPRM be changed to a supersedure of AD
2007-20-01, Amendment 39-15211 (72 FR 54533, September 26, 2007) (AD
2007-20-01). Delta stated that paragraph (f) of AD 2007-20-01 requires
accomplishing Boeing Special Attention Service Bulletin 747-57-2327,
Revision 1, dated July 10, 2006; and Boeing Special Attention Service
Bulletin 747-57-2326, dated January 4, 2007. Delta also stated that the
NPRM would require new actions in accordance with the latest revisions
of the same service information required in AD 2007-20-01. Delta
concluded that it would make compliance simpler by having all of the
work in one place and not split between multiple versions of the same
bulletins, provided credit is given for accomplishment of Work Packages
1 through 20 using previous revisions of Boeing Special Attention
Service Bulletin 747-57-2327, Revision 8, dated November 13, 2020.
The FAA disagrees with the request. The FAA considered superseding
AD 2007-20-01 to mandate actions that are necessary to address Special
Federal Aviation Regulation No. 88 (SFAR 88) that were unintentionally
omitted from Boeing Special Attention Service Bulletin 747-57-2327,
Revision 1, dated July 10, 2006. However, the FAA reviewed Boeing
Special Attention Service Bulletin 747-57-2327, Revision 8, dated
November 13, 2020, and identified AD requirements for additional
airplane groups and work packages. The FAA determined that a stand-
alone AD would be appropriate because the actions required by AD 2007-
20-01 have already been accomplished and paragraph (g) of this AD only
applies to some of the airplanes identified in AD 2007-20-01. The
additional work in Boeing Special Attention Service Bulletin 747-57-
2327, Revision 8, dated November 13, 2020, is only required for certain
airplanes, as identified in paragraphs (g)(1) and (2) of this AD. In
addition, the actions specified in paragraph (g)(3) of this AD, using
Boeing Special Attention Service Bulletin 747-57-2326, Revision 1,
dated January 31, 2008, are only required for certain airplanes. The
FAA has not changed this AD in this regard.
Request To Revise Initial Compliance Time for an Airworthiness
Limitation
UPS requested that the initial compliance time in paragraph (h)(1)
of the proposed AD be revised. UPS stated the compliance time should be
within 12 years after incorporation of Boeing Special Attention Service
Bulletin 747-57-2327, or within 24 months after the effective date of
this AD, whichever occurs later. UPS stated the initial compliance time
for AWL 28-AWL-33 is not stated in The Boeing Company 747-400
Maintenance Planning Data (MPD) Document, Section 9, Airworthiness
Limitations (AWLs) and Certification Maintenance Requirements (CMRs),
D621U400-9, Revision February 2020. UPS noted that paragraph (h)(1) of
the proposed AD states the initial compliance time is at the time in
the MPD document or within 60 days. UPS stated that due to the age of
the affected airplanes that many would have to comply within the 60-day
initial compliance time, which would put an undue burden on operators
because this task requires extensive access common to heavy
maintenance.
The FAA agrees to revise the initial compliance time. It was not
the FAA's
[[Page 34122]]
intention to mandate the initial AWL No. 28-AWL-33 inspection tasks
within 60 days after the effective date of this AD for operators that
have not yet incorporated AWL No. 28-AWL-33 into the existing
maintenance or inspection program, as applicable. However, the FAA
disagrees with the compliance time proposed by UPS. The compliance time
for AWL No. 28-AWL-33 depends on whether AWL No. 28-AWL-33 has already
been incorporated into the operator's existing maintenance or
inspection program, and on whether Boeing Special Attention Service
Bulletin 747-57-2327 has been incorporated. AWL No. 28-AWL-33 applies
to airplanes on which Boeing Special Attention Service Bulletin 747-57-
2327 has been incorporated and airplanes having line number 645 and on.
The FAA has revised the initial compliance time in paragraph (h)(1) of
this AD by making this distinction of whether AWL No. 28-AWL-33 was
previously incorporated into the operator's maintenance or inspection
program and allowing for a 12 month initial compliance time if certain
conditions apply. The FAA also revised the text for the initial
compliance time in paragraph (h)(1) of this AD by replacing the
reference to ``the tasks'' with a reference to ``AWL No. 28-AWL-33'' as
it is the only task. The other AWL items referenced in paragraph (h)(1)
of this AD are Critical Design Configuration Control Limitations
(CDCCLs).
In addition, the FAA has revised the initial compliance time for
AWL No. 28-AWL-25 in paragraph (h)(2) of this AD by making this
distinction of whether AWL No. 28-AWL-25 was previously incorporated
into the operator's maintenance or inspection program and allowing for
a 12 month initial compliance time if certain conditions apply. The
compliance time specified in the proposed AD for AWL No. 28-AWL-25 has
a similar issue to the one for AWL No. 28-AWL-33. The FAA did not
intend to mandate the initial AWL No. 28-AWL-25 inspection task within
60 days after the effective date of this AD for operators that have not
already incorporated the task into the operator's existing maintenance
or inspection program. The FAA also revised the text for the initial
compliance time in paragraph (h)(2) of this AD by replacing the
reference to ``the tasks'' with a reference to ``AWL No. 28-AWL-25'' as
it is the only task. The other AWL items referenced in paragraph (h)(2)
of this AD are CDCCLs.
Request To Remove Inspection for Sealant
UPS requested that the FAA remove paragraph (g)(2) of the proposed
AD (which includes a requirement to inspect and seal the ends of
certain fasteners inside the fuel tanks). UPS stated that AD 2007-20-01
includes a requirement to seal the ends of certain fasteners inside the
fuel tanks in accordance with Boeing Special Attention Service Bulletin
747-57-2327, Revision 1, dated July 10, 2006. UPS stated that Step 5 of
Figure 23 of Boeing Special Attention Service Bulletin 747-57-2327,
Revision 1, dated July 10, 2006, specifies to apply the fillet sealant
on the fastener and refers to certain airplane maintenance manual (AMM)
procedures. UPS also noted that CDCCL 28-AWL-37, added by paragraph (h)
of the proposed AD, only checks for cracked or damaged sealant. UPS
concluded that paragraph (g)(2) does not provide any additional
improvement in the condition of the affected airplanes from that
required by AD 2007-20-01, and therefore should not be required.
The FAA disagrees with the request. The purpose of paragraph (g)(2)
of this AD is to make sure that the fillet sealant on identified
fasteners fully encapsulates those fasteners. Boeing Special Attention
Service Bulletin 747-57-2327, Revision 1, dated July 10, 2006, does not
specify to make sure that the fasteners are fully encapsulated with
sealant. The AMM procedures are references only and therefore does not
mandate that fasteners are fully encapsulated. Since Boeing Special
Attention Service Bulletin 747-57-2327, Revision 8, dated November 13,
2020, also does not specify to fully encapsulate the fasteners, the
requirement in paragraph (g)(2) of this AD includes an exception that
states where note (f) of Figure 23 specifies to ``make sure to apply
the fillet sealant on the fastener,'' this AD requires applying the
fillet sealant to fully encapsulate the fastener penetrating the fuel
tank. The FAA has not changed this AD in this regard.
Request To Provide Credit for Previous Actions
UPS requested that paragraph (j) of the proposed AD be revised to
give credit for previous actions accomplished using Boeing Special
Attention Service Bulletin 747-57-2326, Revision 1, dated January 31,
2008. UPS stated that it performed the requirement to seal the ends of
certain fasteners using Boeing Special Attention Service Bulletin 747-
57-2326, Revision 1, dated January 31, 2008, as an alternative method
of compliance to AD 2007-20-01 (which mandated Boeing Special Attention
Service Bulletin 747-57-2326, dated January 4, 2007). UPS stated it
does not believe they need to go back and verify that previously
accomplished actions were done as directed. UPS notes that paragraph
(f) of the proposed AD does state to comply with the AD unless already
done, but paragraph (j) of the proposed AD does not give credit for
previous actions accomplished using Boeing Special Attention Service
Bulletin 747-57-2326, Revision 1, dated January 31, 2008. UPS also
stated that if credit is not given, the FAA should provide an
explanation as to why operators need to go back and verify that
previous AD required actions were accomplished as directed.
The FAA agrees that operators that sealed the fasteners using
Boeing Special Attention Service Bulletin 747-57-2326, Revision 1,
dated January 31, 2008, do not have to go back and verify that all
fasteners identified in Figures 4 and 5 of Boeing Special Attention
Service Bulletin 747-57-2326, Revision 1, dated January 31, 2008, were
sealed in accordance with Figure 1 of that same service bulletin. Only
airplanes on which the fasteners were sealed using Boeing Special
Attention Service Bulletin 747-57-2326, dated January 4, 2007, must be
inspected and the fasteners sealed if necessary. The FAA has revised
paragraph (g)(3) of this AD accordingly.
The FAA also notes there is no need to provide credit in paragraph
(j) of the AD for actions taken using Boeing Special Attention Service
Bulletin 747-57-2326, Revision 1, dated January 31, 2008, because
paragraph (f) of the AD mandates compliance with this AD within the
compliance times specified, unless already done.
Conclusion
The FAA reviewed the relevant data, considered any comments
received, and determined that air safety requires adopting this AD as
proposed. 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.
Related Service Information Under 1 CFR Part 51
The FAA reviewed Boeing Special Attention Service Bulletin 747-57-
2327, Revision 8, dated November 13, 2020. This service information
describes procedures for reconfiguring the clamps
[[Page 34123]]
of certain wire bundles, applying sealant to certain fasteners that
penetrate the fuel tank walls, and installing cushion clamps and TFE
sleeves on the wire bundles of the front spars and rear spars of the
wings.
The FAA also reviewed Boeing Special Attention Service Bulletin
747-57-2326, Revision 1, dated January 31, 2008. This service
information describes procedures for, among other actions, applying
sealant to certain fasteners.
The FAA also reviewed The Boeing Company 747-400 Maintenance
Planning Data (MPD) Document, Section 9, Airworthiness Limitations
(AWLs) and Certification Maintenance Requirements (CMRs), D621U400-9,
Revision February 2020, which includes revised AWL tasks 28-AWL-33, 28-
AWL-34, and 28-AWL-37; and The Boeing Company 747-100/200/300/SP/SR
Airworthiness Limitations (AWLs) and Certification Maintenance
Requirements (CMRs), D6-13747-CMR, Revision September 2020, which
includes revised AWL tasks 28-AWL-25, 28-AWL-27, and 28-AWL-28. The
revised AWL tasks describe fuel airworthiness limitation items (ALIs)
and CDCCLs that address fuel tank systems. These documents are distinct
because they apply to different airplane models. The new AWLs include:
<bullet> An ALI (periodic inspections) of the cushion clamps and
teflon sleeving installed on out-of-tank wire bundles installed on
brackets that are mounted directly on the fuel tanks;
<bullet> A CDCCL for the cushion clamps and teflon sleeving
installed on out-of-tank wire bundles installed on brackets that are
mounted directly on the fuel tanks; and
<bullet> A CDCCL for lightning, fault current or hot short
protection features.
This service information 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 104 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
--------------------------------------------------------------------------------------------------------------------------------------------------------
Reconfiguring clamps, inspections, Up to 30 work-hours x Up to $2,004................. Up to $4,554................. Up to $473,616.
applying sealant, and installing $85 per hour = Up to
clamps and TFE sleeves. $2,550.
--------------------------------------------------------------------------------------------------------------------------------------------------------
The FAA has determined that revising the maintenance or inspection
program takes an average of 90 work-hours per operator, although the
agency recognizes that this number may vary from operator to operator.
Since operators incorporate maintenance or inspection program changes
for their affected fleet(s), the FAA has determined that a per-operator
estimate is more accurate than a per-airplane estimate. Therefore, the
agency estimates the average total cost per operator to be $7,650 (90
work-hours x $85 per work-hour).
The FAA estimates the following costs to do any necessary
application of sealant that would be required based on the results of
the inspections. The agency has no way of determining the number of
aircraft that might need this action:
On-Condition Costs
----------------------------------------------------------------------------------------------------------------
Cost per
Action Labor cost Parts cost product
----------------------------------------------------------------------------------------------------------------
Applying sealant............................................. Up to 102 work- Up to $6,813 Up to $15,483.
hours x $85 per
hour = Up to
$8,670
----------------------------------------------------------------------------------------------------------------
The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, some or all of the costs of
this AD may be covered under warranty, thereby reducing the cost impact
on affected operators.
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.
[[Page 34124]]
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 adding the following new airworthiness
directive:
2022-10-11 The Boeing Company: Amendment 39-22049; Docket No. FAA-
2021-0877; Project Identifier AD-2020-01316-T.
(a) Effective Date
This airworthiness directive (AD) is effective July 11, 2022.
(b) Affected ADs
None.
(c) Applicability
This AD applies to The Boeing Company Model 747-100B SUD, 747-
200B, 747-200C, 747-200F, 747-300, 747SP, 747-400, 747-400D, and
747-400F series airplanes, certificated in any category, having line
numbers 645 and subsequent.
(d) Subject
Air Transport Association (ATA) of America Code 28, Fuel; 57,
Wings.
(e) Unsafe Condition
This AD was prompted by the FAA's analysis of the fuel system
reviews conducted by the manufacturer. The FAA is issuing this AD to
address arcing in the event of a lightning strike or high-powered
short circuit, which could result in a fuel tank explosion or fire.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Reconfiguration of Wire Bundle Clamps, Sealant Application,
Installation of Clamps and Sleeves, Inspections, and Corrective Actions
(1) For Group 1 through 9, 11, and 16 through 45 airplanes
identified in Boeing Special Attention Service Bulletin 747-57-2327,
Revision 8, dated November 13, 2020: Within 60 months after the
effective date of this AD, reconfigure the clamps of the specified
wire bundles, apply sealant to the specified fasteners that
penetrate the fuel tank walls, and install cushion clamps and
polytetrafluoroethylene (TFE) sleeves on the wire bundles of the
front spars and rear spars of the wings, as applicable, in
accordance with Work Packages 13 through 21, as applicable, of the
Accomplishment Instructions of Boeing Special Attention Service
Bulletin 747-57-2327, Revision 8, dated November 13, 2020.
(2) For airplanes on which the actions specified in Work Package
7, 8, or 9 of Boeing Special Attention Service Bulletin 747-57-2327
have been done: Within 60 months after the effective date of this
AD, inspect to determine if the fillet sealant identified in step 5
of Figure 23 of Boeing Special Attention Service Bulletin 747-57-
2327, Revision 8, dated November 13, 2020, was applied to fully
encapsulate the fastener penetrating the fuel tank; and if the
sealant does not fully encapsulate the fastener, before further
flight, apply sealant as specified in step 5 of Figure 23, except
where note (f) of Figure 23 specifies to ``make sure to apply the
fillet sealant on the fastener,'' this AD requires applying the
fillet sealant to fully encapsulate the fastener penetrating the
fuel tank.
(3) For Group 2 airplanes identified in Boeing Special Attention
Service Bulletin 747-57-2326, Revision 1, dated January 31, 2008, on
which fasteners were sealed using Boeing Special Attention Service
Bulletin 747-57-2326, dated January 4, 2007: Within 60 months after
the effective date of this AD, inspect to determine if all fasteners
identified in Figures 4 and 5 of Boeing Special Attention Service
Bulletin 747-57-2326, Revision 1, dated January 31, 2008, have been
sealed; and if any fasteners are not sealed, before further flight,
apply sealant in accordance with Figure 1 of Boeing Special
Attention Service Bulletin 747-57-2326, Revision 1, dated January
31, 2008.
(h) Maintenance or Inspection Program Revision
(1) For Model 747-400, 747-400D, and 747-400F series airplanes:
Within 60 days after the effective date of this AD: Revise the
existing maintenance or inspection program, as applicable, by
incorporating the information in airworthiness limitations (AWLs)
28-AWL-33, 28-AWL-34, and 28-AWL-37 of The Boeing Company 747-400
Maintenance Planning Data (MPD) Document, Section 9, Airworthiness
Limitations (AWLs) and Certification Maintenance Requirements
(CMRs), D621U400-9, Revision February 2020. The initial compliance
time for doing AWL No. 28-AWL-33, ``Cushion Clamps and Teflon
Sleeving Installed on Out-of-Tank Wire Bundles Installed on Brackets
that are Mounted Directly on the Fuel Tanks,'' is at the applicable
time specified in paragraphs (h)(1)(i) or (ii) of this AD.
(i) For airplanes that did not have any version of AWL No. 28-
AWL-33 in the existing maintenance or inspection program before the
effective date of this AD: Within 144 months since issuance of the
original airworthiness certificate or original export certificate of
airworthiness, within 144 months since Boeing Special Attention
Bulletin 747-57-2327 was incorporated, or within 12 months after the
effective date of this AD, whichever occurs latest.
(ii) For airplanes not identified in paragraph (h)(1)(i) of this
AD: Within 144 months since AWL No. 28-AWL-33 was incorporated into
the existing maintenance or inspection program, or within 144 months
after the most recent inspection was performed as specified in AWL
No. 28-AWL-33, whichever occurs later.
(2) For Model 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-
300, and 747SP series airplanes: Within 60 days after the effective
date of this AD, revise the existing maintenance or inspection
program, as applicable, by incorporating the information in AWLs 28-
AWL-25, 28-AWL-27, and 28-AWL-28 of The Boeing Company 747-100/200/
300/SP/SR Airworthiness Limitations (AWLs) and Certification
Maintenance Requirements (CMRs), D6-13747-CMR, Revision September
2020; except where the ``Applicability'' of AWLs 28-AWL-25 and 28-
AWL-27 specifies ``ALL'' and ``NOTE,'' replace ``ALL'' and ``NOTE''
with ``Airplanes L/N 645 and on'' and remove the ``Applicability
Note'' from the Description column of 28-AWL-25 and 28-AWL-27. The
initial compliance time for doing AWL No. 28 AWL-25, ``Cushion
Clamps and Teflon Sleeving Installed on Out-of-Tank Wire Bundles
Installed on Brackets that are Mounted Directly on the Fuel Tanks,''
is at the applicable time specified in paragraphs (h)(2)(i) or (ii)
of this AD.
(i) For airplanes that did not have any version of AWL No. 28-
AWL-25 in the existing maintenance or inspection program before the
effective date of this AD: Within 144 months since issuance of the
original airworthiness certificate or original export certificate of
airworthiness, within 144 months since Boeing Special Attention
Bulletin 747-57-2327 was incorporated, or within 12 months after the
effective date of this AD, whichever occurs latest.
(ii) For airplanes not identified in paragraph (h)(2)(i) of this
AD: Within 144 months since AWL No. 28-AWL-25 was incorporated into
the maintenance or inspection program, or within 144 months after
the most recent inspection was performed as specified in AWL No. 28-
AWL-25, whichever occurs later.
(i) No Alternative Actions, Intervals, and Critical Design
Configuration Control Limitations (CDCCLs)
After the maintenance or inspection program has been revised as
required by paragraph (h)(1) or (2) of this AD, no alternative
actions (e.g., inspections), intervals, and CDCCLs may be used
unless the actions, intervals, and CDCCLs are approved as an
alternative method of compliance (AMOC) in accordance with the
procedures specified in paragraph (k) of this AD.
(j) Credit for Previous Actions
(1) This paragraph provides credit for the Work Package 13
actions specified in paragraph (g)(1) of this AD, if those actions
were performed before the effective date of this AD using the
service information specified in paragraphs (j)(1)(i) through (iv)
of this AD.
[[Page 34125]]
(i) Boeing Special Attention Service Bulletin 747-57-2327,
Revision 4, dated August 26, 2010.
(ii) Boeing Special Attention Service Bulletin 747-57-2327,
Revision 5, dated September 20, 2011.
(iii) Boeing Special Attention Service Bulletin 747-57-2327,
Revision 6, dated February 21, 2013.
(iv) Boeing Special Attention Service Bulletin 747-57-2327,
Revision 7, dated November 30, 2017.
(2) This paragraph provides credit for the Work Package 14, 15,
and 16 actions specified in paragraph (g)(1) of this AD, if those
actions were performed before the effective date of this AD using
the service information specified in paragraphs (j)(2)(i) through
(iii) of this AD.
(i) Boeing Special Attention Service Bulletin 747-57-2327,
Revision 5, dated September 20, 2011.
(ii) Boeing Special Attention Service Bulletin 747-57-2327,
Revision 6, dated February 21, 2013.
(iii) Boeing Special Attention Service Bulletin 747-57-2327,
Revision 7, dated November 30, 2017.
(3) This paragraph provides credit for the Work Package 17
actions specified in paragraph (g)(1) of this AD, if those actions
were performed before the effective date of this AD using the
service information specified in paragraphs (j)(3)(i) or (ii) of
this AD.
(i) Boeing Special Attention Service Bulletin 747-57-2327,
Revision 6, dated February 21, 2013.
(ii) Boeing Special Attention Service Bulletin 747-57-2327,
Revision 7, dated November 30, 2017.
(4) This paragraph provides credit for the Work Package 18, 19,
and 20 actions specified in paragraph (g)(1) of this AD, if those
actions were performed before the effective date of this AD using
Boeing Special Attention Service Bulletin 747-57-2327, Revision 7,
dated November 30, 2017.
(k) Alternative Methods of Compliance (AMOCs)
(1) The Manager, Seattle ACO 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
the certification office, send it to the attention of the person
identified in paragraph (l)(1) of this AD. Information may be
emailed to: <a href="/cdn-cgi/l/email-protection#c1f8ec808f8cec92a4a0b5b5ada4ec80828eec808c8e82ec93a4b0b4a4b2b5b281a7a0a0efa6aeb7"><span class="__cf_email__" data-cfemail="7b42563a353656281e1a0f0f171e563a3834563a36343856291e0a0e1e080f083b1d1a1a551c140d">[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, Seattle
ACO 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.
(l) Related Information
(1) For more information about this AD, contact Rose Len,
Aerospace Engineer, Propulsion Section, FAA, Seattle ACO Branch,
2200 South 216th St., Des Moines, WA 98198; phone and fax: 206-231-
3604; email: <a href="/cdn-cgi/l/email-protection#384a574b5d16545d56785e5959165f574e"><span class="__cf_email__" data-cfemail="e1938e9284cf8d848fa1878080cf868e97">[email protected]</span></a>.
(2) Service information identified in this AD that is not
incorporated by reference is available at the addresses specified in
paragraphs (m)(3) and (4) of this AD.
(m) Material Incorporated by Reference
(1) The Director of the Federal Register approved the
incorporation by reference (IBR) of the service information listed
in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) You must use this service information as applicable to do
the actions required by this AD, unless the AD specifies otherwise.
(i) Boeing Special Attention Service Bulletin 747-57-2326,
Revision 1, dated January 31, 2008.
(ii) Boeing Special Attention Service Bulletin 747-57-2327,
Revision 8, dated November 13, 2020.
(iii) The Boeing Company 747-100/200/300/SP/SR Airworthiness
Limitations (AWLs) and Certification Maintenance Requirements
(CMRs), D6-13747-CMR, Revision September 2020.
(iv) The Boeing Company 747-400 Maintenance Planning Data (MPD)
Document, Section 9, Airworthiness Limitations (AWLs) and
Certification Maintenance Requirements (CMRs), D621U400-9, Revision
February 2020.
(3) For service information 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; internet <a href="https://www.myboeingfleet.com">https://www.myboeingfleet.com</a>. You may view this service information at the
FAA, Airworthiness Products Section, Operational Safety Branch, 2200
South 216th St., Des Moines, WA.
(4) You may view this service information 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.
(5) You may view this service information that is incorporated
by reference at the National Archives and Records Administration
(NARA). For information on the availability of this material at
NARA, <a href="/cdn-cgi/l/email-protection#fe988cd097908d8e9b9d8a979190be909f8c9fd0999188"><span class="__cf_email__" data-cfemail="1a7c68347374696a7f796e7375745a747b687b347d756c">[email protected]</span></a>, or go to: <a href="https://www.archives.gov/federal-register/cfr/ibr-locations.html">https://www.archives.gov/federal-register/cfr/ibr-locations.html</a>.
Issued on May 6, 2022.
Gaetano A. Sciortino,
Deputy Director for Strategic Initiatives, Compliance & Airworthiness
Division, Aircraft Certification Service.
[FR Doc. 2022-12030 Filed 6-3-22; 8:45 am]
BILLING CODE 4910-13-P
</pre><script data-cfasync="false" src="/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js"></script></body>
</html>Indexed from Federal Register on June 6, 2022.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.