Proposed Rule2021-24834
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
November 17, 2021
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to adopt 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 proposed 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 proposed AD would 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 polytetrafluoroethylene (TFE) sleeves, inspecting to determine if sealant was applied to certain fasteners, and applying sealant if necessary. This proposed AD would also require, for all airplanes, revising the maintenance or inspection program, as applicable, to incorporate new, more restrictive airworthiness limitations. The FAA is proposing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 86 Issue 219 (Wednesday, November 17, 2021)</title>
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[Federal Register Volume 86, Number 219 (Wednesday, November 17, 2021)]
[Proposed Rules]
[Pages 64085-64089]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2021-24834]
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Proposed Rules
Federal Register
________________________________________________________________________
This section of the FEDERAL REGISTER contains notices to the public of
the proposed issuance of rules and regulations. The purpose of these
notices is to give interested persons an opportunity to participate in
the rule making prior to the adoption of the final rules.
========================================================================
Federal Register / Vol. 86, No. 219 / Wednesday, November 17, 2021 /
Proposed Rules
[[Page 64085]]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2021-0877; Project Identifier AD-2020-01316-T]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
-----------------------------------------------------------------------
SUMMARY: The FAA proposes to adopt 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 proposed 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 proposed AD would 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 polytetrafluoroethylene (TFE)
sleeves, inspecting to determine if sealant was applied to certain
fasteners, and applying sealant if necessary. This proposed AD would
also require, for all airplanes, revising the maintenance or inspection
program, as applicable, to incorporate new, more restrictive
airworthiness limitations. The FAA is proposing this AD to address the
unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by January 3,
2022.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
<bullet> Federal eRulemaking Portal: Go to <a href="https://www.regulations.gov">https://www.regulations.gov</a>. Follow the instructions for submitting comments.
<bullet> Fax: 202-493-2251.
<bullet> 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.
<bullet> Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
For service information identified in this NPRM, 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. Boeing Special Attention Service Bulletin 747-57-
2327, Revision 8, dated November 13, 2020, is also available on the
internet 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 on the internet 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 NPRM, any comments received, and other information. The street
address for Docket Operations is listed above.
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#f5879a8690db99909bb5939494db929a83"><span class="__cf_email__" data-cfemail="91e3fee2f4bffdf4ffd1f7f0f0bff6fee7">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Comments Invited
The FAA invites you to send any written relevant data, views, or
arguments about this proposal. Send your comments to an address listed
under ADDRESSES. Include ``Docket No. FAA-2021-0877; Project Identifier
AD-2020-01316-T'' at the beginning of your comments. The most helpful
comments reference a specific portion of the proposal, explain the
reason for any recommended change, and include supporting data. The FAA
will consider all comments received by the closing date and may amend
the proposal because of those comments.
Except for Confidential Business Information (CBI) as described in
the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to
<a href="https://www.regulations.gov">https://www.regulations.gov</a>, including any personal information you
provide. The agency will also post a report summarizing each
substantive verbal contact received about this proposed AD.
Confidential Business Information
CBI is commercial or financial information that is both customarily
and actually treated as private by its owner. Under the Freedom of
Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public
disclosure. If your comments responsive to this NPRM contain commercial
or financial information that is customarily treated as private, that
you actually treat as private, and that is relevant or responsive to
this NPRM, it is important that you clearly designate the submitted
comments as CBI. Please mark each page of your submission containing
CBI as ``PROPIN.'' The FAA will treat such marked submissions as
confidential under the FOIA, and they will not be placed in the public
docket of this NPRM. Submissions containing CBI should be sent to 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#03716c70662d6f666d436562622d646c75"><span class="__cf_email__" data-cfemail="11637e62743f7d747f517770703f767e67">[email protected]</span></a>. Any commentary that the FAA receives
which is not specifically designated as CBI will be placed in the
public docket for this rulemaking.
Background
The FAA has examined the underlying safety issues involved in fuel
tank explosions on several large transport airplanes, including the
adequacy of existing regulations, the service history of airplanes
subject to those regulations, and existing maintenance practices for
fuel tank systems. As a result of those findings,
[[Page 64086]]
the FAA issued a final rule titled ``Transport Airplane Fuel Tank
System Design Review, Flammability Reduction, and Maintenance and
Inspection Requirements'' (66 FR 23086, May 7, 2001). In addition to
new airworthiness standards for transport airplanes and new maintenance
requirements, that rule included Amendment 21-78, which established
Special Federal Aviation Regulation No. 88 (``SFAR 88'') at 14 CFR part
21. Subsequently, SFAR 88 was amended by Amendment 21-82 (67 FR 57490,
September 10, 2002; corrected at 67 FR 70809, November 26, 2002) and
Amendment 21-83 (67 FR 72830, December 9, 2002; corrected at 68 FR
37735, June 25, 2003, to change ``21-82'' to ``21-83'').
Among other actions, SFAR 88 requires certain type design (i.e.,
type certificate (TC) and supplemental type certificate (STC)) holders
to substantiate that their fuel tank systems can prevent ignition
sources in the fuel tanks. This requirement applies to type design
holders for large turbine-powered transport airplanes and for
subsequent modifications to those airplanes. It requires them to
perform design reviews and to develop design changes and maintenance
procedures if their designs do not meet the new fuel tank safety
standards. As explained in the preamble to the final rule published on
May 7, 2001, the FAA intended to adopt airworthiness directives to
mandate any changes found necessary to address unsafe conditions
identified as a result of these reviews.
In evaluating these design reviews, the FAA has established four
criteria intended to define the unsafe conditions associated with fuel
tank systems that require corrective actions. The percentage of
operating time during which fuel tanks are exposed to flammable
conditions is one of these criteria. The other three criteria address
the failure types under evaluation: Single failures, combination of
failures, and unacceptable (failure) experience. For all three failure
criteria, the evaluations included consideration of previous actions
taken that may mitigate the need for further action.
The FAA has determined that the actions identified in this proposed
AD are necessary to reduce the potential of ignition sources inside
fuel tanks, which, in combination with flammable fuel vapors, could
result in fuel tank explosion or fire.
The FAA has received a report indicating that a certain type of
fastener used in the fuel tank walls of Model 747 airplanes is
insufficiently bonded to the airplane structure. Further, these
fasteners do not have sufficient electrical insulation applied inside
the fuel tanks to prevent arcing in the event of a lightning strike or
high-powered short circuit. This condition, if not corrected, could
result in a fuel tank explosion or fire.
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 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 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
(AWL) 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 critical design configuration control limitations (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 the ADDRESSES section.
Other Relevant Rulemaking
AD 2007-20-01, Amendment 39-15211 (72 FR 54533, September 26, 2007)
(AD 2007-20-01), requires actions in accordance with Boeing Service
Bulletin 747-57-2326, dated January 4, 2007; and Boeing Service
Bulletin 747-57-2327, Revision 1, dated July 10, 2006. AD 2007-20-01
applies 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 FAA has determined that AD 2007-20-01 did not
fully address the unsafe condition for Model 747-100B SUD, 747-200B,
747-200C, 747-200F, 747-300, 747SP, 747-400, 747-400D, and 747-400F
series airplanes. The service information for AD 2007-20-01 has been
revised and contains additional work as described previously.
FAA's Determination
The FAA is proposing this AD because the agency evaluated all the
relevant information and determined the unsafe condition described
previously is likely to exist or develop in other products of the same
type design.
Proposed AD Requirements
This proposed AD would 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. This
proposed AD would also require, for all airplanes, revising the
maintenance or inspection program, as applicable, to incorporate new,
more restrictive airworthiness limitations.
Differences Between This Proposed AD and the Service Information
Boeing Special Attention Service Bulletin 747-57-2327, Revision 8,
dated November 13, 2020, specifies a compliance time of 60 months to
accomplish Work Packages 13 through 20 and a compliance time of 27
months to accomplish Work Package 21. The FAA has determined that all
work packages may be done within 60 months as it is not necessary to
accomplish Work Package 21 prior to the other work packages. The FAA
has determined that the 60-month compliance time is appropriate and
will not adversely affect safety.
In The Boeing Company 747-100/200/300/SP/SR Airworthiness
Limitations (AWLs) and Certification Maintenance Requirements (CMRs),
D6-
[[Page 64087]]
13747-CMR, Revision September 2020, the ``Applicability'' of
airworthiness limitations 28-AWL-25 and 28-AWL-27 specifies ``ALL'' and
``NOTE.'' The FAA has determined that the applicability should be
``Airplanes L/N 645 and on'' as those limitations do not apply to
airplanes having line numbers 1 through 644 inclusive. In addition, the
``Applicability Note'' in the Description column does not apply. This
difference is specified in paragraph (h)(2) of the proposed AD.
Costs of Compliance
The FAA estimates that this proposed AD affects 104 airplanes of
U.S. registry. The FAA estimates the following costs to comply with
this proposed AD:
Estimated Costs
----------------------------------------------------------------------------------------------------------------
Action Labor cost Parts cost Cost per product Cost on U.S. operators
----------------------------------------------------------------------------------------------------------------
Reconfiguring clamps, Up to 30 work- Up to $2,004..... Up to $4,554..... Up to $473,616.
inspections, applying hours x $85 per
sealant, and installing 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 proposed inspections. The agency has no way of determining the
number of aircraft that might need this action:
On-Condition Costs
----------------------------------------------------------------------------------------------------------------
Action Labor cost Parts cost Cost per product
----------------------------------------------------------------------------------------------------------------
Applying sealant..................... Up to 102 work-hours x Up to $6,813........... Up to $15,483.
$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 proposed 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
The FAA determined that this proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD would 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 this proposed
regulation:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Would not affect intrastate aviation in Alaska, and
(3) Would 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 Proposed Amendment
Accordingly, under the authority delegated to me by the
Administrator, the FAA proposes to amend 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:
The Boeing Company: Docket No. FAA-2021-0877; Project Identifier AD-
2020-01316-T.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by January 3, 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 57, Wings.
[[Page 64088]]
(e) Unsafe Condition
This AD was prompted by 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 Service Bulletin
747-57-2326, Revision 1, dated January 31, 2008: Within 60 months
after the effective date of this AD, inspect to determine if all
fasteners identified in Figures 4 and 5 of Boeing 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 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 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 (AWL) and Certification Maintenance Requirements (CMRs),
D621U400-9, Revision February 2020. The initial compliance time for
doing the tasks is at the time specified in Boeing 747-400 MPD
Document, Section 9, AWL and CMRs, D621U400-9, Revision February
2020, or within 60 days after the effective date of this AD,
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
airworthiness limitations 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
airworthiness limitations 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 the tasks is at the time specified in The Boeing Company
Airworthiness Limitations (AWLs) and Certification Maintenance
Requirements (CMRs), D6-13747-CMR, Revision September 2020, or
within 60 days after the effective date of this AD, 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.
(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#360f1b77787b1b65535742425a531b7775791b777b79751b64534743534542457650575718515940"><span class="__cf_email__" data-cfemail="291004686764047a4c485d5d454c04686a66046864666a047b4c585c4c5a5d5a694f4848074e465f">[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#62100d11074c0e070c220403034c050d14"><span class="__cf_email__" data-cfemail="e4968b9781ca88818aa4828585ca838b92">[email protected]</span></a>.
(2) 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;
[[Page 64089]]
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.
Issued on October 8, 2021.
Gaetano A. Sciortino,
Deputy Director for Strategic Initiatives, Compliance & Airworthiness
Division, Aircraft Certification Service.
[FR Doc. 2021-24834 Filed 11-16-21; 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 November 17, 2021.
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