Rule2021-16174
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
July 30, 2021
Effective
September 3, 2021
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 737 airplanes powered by LEAP-1B engines. This AD was prompted by reports of inadvertent release of the spring energy of the spring door opening system (SDOS) actuator with a certain part number, causing injury and the potential for injury to maintenance personnel. This AD requires replacing each affected SDOS actuator with a new SDOS actuator, and verifying that new safety markers are installed in the proper locations. The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 86 Issue 144 (Friday, July 30, 2021)</title>
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[Federal Register Volume 86, Number 144 (Friday, July 30, 2021)]
[Rules and Regulations]
[Pages 40927-40932]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2021-16174]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2020-0333; Product Identifier 2020-NM-015-AD; Amendment
39-21623; AD 2021-13-18]
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 adopting a new airworthiness directive (AD) for all
The Boeing Company Model 737 airplanes powered by LEAP-1B engines. This
AD was prompted by reports of inadvertent release of the spring energy
of the spring door opening system (SDOS) actuator with a certain part
number, causing injury and the potential for injury to maintenance
personnel. This AD requires replacing each affected SDOS actuator with
a new SDOS actuator, and verifying that new safety markers are
installed in the proper locations. The FAA is issuing this AD to
address the unsafe condition on these products.
DATES: This AD is effective September 3, 2021.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of September 3,
2021.
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 on
the internet at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by searching for and
locating Docket No. FAA-2020-0333.
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-2020-
0333; 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
[[Page 40928]]
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#03716c70662d6f666d436562622d646c75"><span class="__cf_email__" data-cfemail="b1c3dec2d49fddd4dff1d7d0d09fd6dec7">[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 all The Boeing Company
Model 737-8 and 737-9 airplanes. The NPRM published in the Federal
Register on April 20, 2020 (85 FR 21791).
The NPRM was prompted by a report of an incident involving an SDOS
actuator. The SDOS actuator is a telescopic, spring-loaded actuator
that assists the mechanic in raising the engine fan cowl. Even when the
actuator is extended (uncompressed), it retains energy in the spring
(preloaded). In the incident, after an SDOS actuator with part number
BOE-2001-901F was removed, a part separation occurred at the joint
between the actuator's inner tube and its related ``back end'' bracket.
The actuator came apart with spring-propelled force, injuring one of
the maintenance personnel. This SDOS actuator used two roll pins and
epoxy at this joint. The FAA has determined that this design, together
with spring preload, caused these parts to break.
The FAA received a second report of a hazardous sudden extension of
this actuator when, during improper removal of the SDOS actuator from
the engine fan cowl while it was retracted, the SDOS actuator rapidly
extended, with the potential to cause injury. This was possible because
the fastener connecting the SDOS actuator to the fan cowl can be
removed by cracking open the fan cowl and reaching under it. After the
fastener was removed, the SDOS actuator was still connected to the
engine fan case and was held in the retracted position by the ``catch''
hook, per the design. When the SDOS was rotated upward by hand, the
catch hook released, and the SDOS actuator rapidly extended. The FAA
has determined that the design of the SDOS actuator with part number
BOE-2001-901H obscures the safety marker when the fan cowl is opened.
The design of this SDOS actuator could, during maintenance, result in
injury to maintenance personnel or damage to the airplane.
The manufacturer of the SDOS actuator, General Aerospace, has
changed the design to have a stronger joint between the inner tube and
the ``back end'' bracket that uses blind rivets rather than pins,
together with an improved shape of the ``catching'' bracket. This
redesign addressed the aforementioned part separation of the SDOS
actuator, and the redesigned actuator became part number BOE-2001-901H.
General Aerospace then modified part number BOE-2001-901H to include
more detailed safety markers in new locations that display the warnings
more clearly to maintenance personnel. That redesign addressed the
aforementioned extension of the SDOS actuator from release of the catch
hook. With the addition of the more detailed safety markers in the new
locations, the SDOS actuator part number changed from BOE-2001-901H to
BOE-2001-901J. General Aerospace Service Bulletin BOE-2001-901-71-01,
dated November 2, 2019, which is referenced in Boeing Service Bulletin
737-71-1911, Revision 1, dated September 10, 2020, provides
instructions for changing a BOE-2001-901H SDOS actuator to a BOE-2001-
901J SDOS actuator.
The NPRM therefore proposed to require replacing each affected SDOS
actuator with a new SDOS actuator, and verifying that the new safety
markers are installed in the proper locations on the SDOS actuator.
The FAA is issuing this AD to address the possible separation of
the SDOS actuator, and the visual obstruction of the SDOS actuator
safety marker, either of which, during maintenance, could cause injury
to maintenance personnel or damage to the airplane.
Actions Since the NPRM Was Issued
In the NPRM, the FAA proposed that the AD would apply to Boeing
model 737-8 and 737-9 airplanes. Since then, the FAA determined that
all Boeing model 737 airplanes powered by LEAP-1B engines (737 MAX
airplanes), have engine fan cowls on which affected SDOS actuators
could be installed. The affected SDOS actuators are rotable parts, so
the future replacement of an SDOS actuator could reintroduce the unsafe
condition. The 737 airplane models that are powered by LEAP-1B engines,
and therefore that have fan cowls on which affected SDOS actuators
could be installed, are currently the Model 737-8, 737-9, and 737-
8200.\1\ The airplane models on which affected actuators could be
installed could include any 737 models which will be powered by LEAP-1B
engines, such as the Model 737-7. Therefore the FAA has revised the
applicability of this AD to include all Model 737 airplanes powered by
LEAP-1B engines. The prohibition on the installation of an affected
SDOS actuator similarly applies to all airplanes identified in the
applicability of this AD.
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\1\ The FAA type certificated the Model 737-8200 on March 31,
2021; there are currently no U.S. operators of that model.
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Comments
The FAA gave the public the opportunity to participate in
developing this final rule. The following presents the comments
received on the NPRM and the FAA's response to each comment.
Request To Update the Service Information to the Latest Revision
Boeing requested that the FAA mandate Boeing Special Attention
Requirements Bulletin 737-71-1911 RB, Revision 1, dated September 10,
2020, because of various updates including removing retrofitted
airplanes from the effectivity, group and configuration changes, and
adapting certain instructions to allow work to be done on an individual
fan cowl instead of all fan cowls at once. The revised service
information does not add work for any airplane.
The FAA agrees. The service information mandated by this AD has
been updated, to Boeing Special Attention Requirements Bulletin 737-71-
1911 RB, Revision 1, dated September 10, 2020.
Request To Include Later Approved Revisions of the Service Information
American Airlines and United Airlines requested that paragraph (g)
of the proposed AD be changed to include the words ``or later approved
revisions'' with regards to Boeing Special Attention Requirements
Bulletin 737-71-1911 RB, dated November 26, 2019.
The requested revision to paragraph (g) of the proposed AD to allow
use of later-approved revisions of the service information would be
contrary to Office of the Federal Register (OFR) regulations regarding
incorporation by reference. Specifically, incorporation by reference of
a publication is limited to the edition of the publication that is
approved by OFR. 1 CFR 51.1(f). To allow operators to use later
revisions of the referenced document that are not approved by the OFR
and identified in the AD, either the FAA must (1) seek OFR approval to
incorporate a later revision of the service document and revise the AD
to reference the approved later revision, or (2) operators must request
approval to use a later revision as an alternative
[[Page 40929]]
method of compliance with this AD under the provisions of paragraph (k)
of this AD.
Request for Clarification of the RC Steps in the Service Information
American Airlines requested clarification of paragraph (g) of the
proposed AD. The commenter stated that it believes that the RC steps in
both Boeing Special Attention Service Bulletin 737-71-1911 and
Requirements Bulletin 737-71-1911 RB can be interpreted to mean that
all steps of each Work Package are Required for Compliance. The company
also states that the instruction to ``Refer to the listed procedures in
SB 737-71-1911 Original Issue or later approved revisions as an
accepted procedure'' found in each Work Package can be interpreted to
mean that any part of the Work Package can be deviated from at the
discretion of the operator, using the accepted procedures in the
service information.
The FAA notes that Boeing's intention in including the multiple
Work Packages, and the FAA's intention in mandating them, is to provide
flexibility to the operator in the sequence of performing the mandated
corrective actions. Each Work Package can be implemented one at a time.
Each Work Package is defined by a unique combination of Group,
Configuration, Engine 1 or Engine 2, and LEFT or RIGHT Fan Cowl
descriptors. All of the Work Packages do not apply to every affected
airplane.
The FAA further notes that both Boeing Special Attention Service
Bulletin 737-71-1911 and Requirements Bulletin 737-71-1911 RB are
consistent in their ``RC: Start'' and ``RC: End'' designations, which
clearly delineate those Required Actions that are mandated by this AD.
The instructions outside of the ``RC: Start'' and ``RC: End'' steps can
be used to accomplish the required actions, but the AD does not
authorize operators to use them as alternatives to the required
actions. Where the service information specifies to ``refer to'' a
recommended procedure, and only for those steps, operators may use an
accepted alternative procedure.
The FAA has added paragraph (i) to this AD to provide credit for
the previous accomplishment of Boeing Special Attention Requirements
Bulletin 737-71-1911 RB, dated November 26, 2019.
Request for Clarification on the Correct Number of Safety Markers
American Airlines asked if the FAA requires a certain number of
safety markers on SDOS part number (P/N) BOE-2001-901J units that have
been changed from SDOS P/N BOE-2001-901H units. The AD requires that
two P/N 12299 safety markers be installed on the SDOS actuator outer
tube (cowl door side) if they are not already installed, but the
commenter noted that there could be a third safety marker, P/N BOE-
2001-713, already installed.
The FAA notes that an operator can comply with this AD by
installing either (1) a P/N BOE-2001-901J actuator with its two
original safety markers, or (2) a P/N BOE-2001-901H actuator that has
been converted to a P/N BOE-2001-901J actuator with two new safety
markers, with or without a third marker. The FAA has not changed this
AD regarding this request.
Request for Clarification on Newly Delivered Airplanes
American Airlines requested clarification on whether the operator
would need to request an AMOC for the newly delivered airplanes that
already have the SDOS part number BOE-2001-901J. The commenter noted
that paragraph (g) of the proposed AD did not include Boeing Special
Attention Requirements Bulletin 737-71-1911 RB, Revision 1, dated
September 10, 2020.
The FAA notes that AMOCs will not be necessary for airplanes that
are newly delivered with the P/N BOE-2001-901J SDOS actuator installed.
As previously explained, paragraph (g) of this AD has been updated to
include Boeing Special Attention Requirements Bulletin 737-71-1911 RB,
Revision 1, dated September 10, 2020, which includes a revised
effectivity list. No further change to this AD is necessary.
Request for Change to the Airplane Applicability
American Airlines and United Airlines requested that paragraph (c)
of the proposed AD be amended to be limited to airplanes identified in
the Effectivity section of Boeing Special Attention Requirements
Bulletin 737-71-1911 RB. As an alternative, American Airlines requested
that a sub-paragraph be added to paragraph (h) of the proposed AD to
state that a review of maintenance and delivery records can be used to
determine the installed SDOS actuator part number, provided the SDOS
part number can be definitively determined from the records check.
The FAA notes that paragraph (c) of this AD now includes all Boeing
Model 737 airplanes powered by LEAP-1B engines. Paragraph (g) of this
AD now mandates Boeing Special Attention Requirements Bulletin 737-71-
1911 RB, Revision 1, dated September 10, 2020. Because all Model 737
airplanes powered by LEAP-1B engines have engine fan cowls that, due to
the rotability of the affected parts, are subject to the same SDOS
actuator issue, paragraph (j) of this AD now prohibits the installation
of SDOS actuators having part numbers BOE-2001-901F and BOE-2001-901H
on all Model 737 airplanes powered by LEAP-1B engines.
Request To Allow Use of Alternative Lockwire
American Airlines requested that the FAA allow use of .040 lockwire
for the lock wire specified in steps 1(b) and 2(b) of the
Accomplishment Instructions of Boeing Special Attention Service
Bulletin 737-71-1911, dated November 26, 2019. American Airlines noted
that the .040 lockwire is more common and readily available than .041
lockwire and would provide an equivalent level of safety. American
Airlines expressed concern that if the FAA interpreted use of .041
lockwire as an RC step, the .040 lockwire could easily be mistakenly
used due to the similarity to the .041 lockwire. The commenter
requested that the FAA include an exception regarding this issue if
appropriate.
The FAA notes that for the purposes of the SDOS actuator, .040
lockwire will function the same as .041 lockwire. The FAA further notes
that Boeing Special Attention Requirements Bulletin 737-71-1911 RB,
Revision 1, dated September 10, 2020, does not specify the use of
lockwire in an RC step. Therefore, no change to this AD is necessary as
a result of this comment.
Request To Change Description of the Incidents Prompting This AD
Boeing requested an update to the SUMMARY and Discussion sections
of the NPRM, and paragraph (e) of the proposed AD, to clarify that
there were two different causes and corrective actions.
The FAA agrees and has revised the Summary, Background, and
paragraph (e) of this AD to delineate the two corrective actions. The
Background section of this final rule describes in detail the two
incidents and how each resulted in the actuator's sudden and hazardous
extension. To address the cause of each incident, this AD requires two
actions, both of which are unchanged from the NPRM: (1) Replacing each
affected SDOS actuator with a new SDOS actuator, and (2) verifying that
new safety markers are installed in the proper locations.
[[Page 40930]]
Request To Update the Number of Affected U.S. Airplanes
Boeing stated that the number of affected U.S.-registered airplanes
identified in the Costs of Compliance section depends on whether the
NPRM covers only the SDOS attachment issue (in which case Boeing stated
the number is correct), or also covers the safety marker issue (in
which case Boeing stated an additional 240 airplanes would be
affected).
The FAA notes that since this AD addresses both the SDOS actuator
attachment issue and the safety marker issue, both types of affected
SDOS actuators must be replaced, resulting in an additional 240 U.S.-
registered airplanes that would be affected. The estimated cost for
this AD has been updated to reflect a total of 400 U.S.-registered
airplanes.
Request To Revise Cost Estimate
Boeing requested that the FAA revise the Costs of Compliance
section of the NPRM to correct the labor cost calculation to $425 per
airplane.
The FAA agrees that the NPRM provided an incorrect estimate for the
number of work-hours to replace the SDOS actuators. The FAA has revised
the costs accordingly in this final rule.
Request To Modify the Affected Part Without Removal
Southwest Airlines requested clarification as to whether the SDOS
actuator part number BOE-2001-901H can be changed on wing to part
number BOE-2001-901J using the General Aerospace Service Bulletin BOE-
2001-901-71-01 referenced in the Boeing Special Attention Service
Bulletin 737-71-1911, Revision 1, dated September 10, 2020. Southwest
Airlines stated that it believes it is possible to do so.
The FAA notes that neither General Aerospace Service Bulletin BOE-
2001-901-71-01, which is referenced in Boeing Special Attention Service
Bulletin 737-71-1911, nor Boeing Special Attention Requirements
Bulletin 737-71-1911 RB, Revision 1, both dated September 10, 2020,
requires removing the SDOS actuator before applying the safety markers.
No change to this final rule is necessary as a result of this comment.
Request To Clarify the Need for Ongoing Inspections
Southwest Airlines asked whether the FAA was developing a
requirement for ongoing inspections to make sure the safety markers are
still present. The commenter stated that Boeing Special Attention
Requirements Bulletin 737-71-1911 RB, dated November 26, 2019, does not
mention inspecting for safety markers after the initial compliance.
The FAA notes that proper installation of the safety markers is
intended to be permanent; therefore, no repetitive inspections of the
safety marker installation are necessary. Because all Model 737
airplanes powered by LEAP-1B engines have engine fan cowls that, due to
parts rotability, are subject to reinstallation of affected SDOS
actuators, those airplanes are subject to the requirements of paragraph
(j) of this AD, which prohibits the installation of SDOS actuators
having part numbers BOE-2001-901F and BOE-2001-901H. The FAA has not
changed this AD as a result of the comment.
Request To Include Instructions for Examination of Spare Parts
United Airlines requested clarification of actions required for
spare parts. The commenter asserted that spare parts should be handled
in the same manner as parts found installed on the aircraft once they
are removed and that Paragraph 3.B., Work Instructions, provided in the
Boeing Special Attention Service Bulletin 737-71-1911, dated November
26, 2019, are intended to be performed at an aircraft level with some
steps not being applicable.
The FAA disagrees and has not changed the AD with regard to this
request. ADs in general do not apply directly to spare parts because
under 14 CFR part 39, ADs are legally enforceable rules that apply only
to products such as airplanes, and not to parts that are not installed
on an airplane. The FAA can, by AD, prohibit or condition the
installation of a part on a product. This AD prohibits the installation
of SDOS actuators having part numbers BOE-2001-901F and BOE-2001-901H.
However, the FAA notes that Boeing Special Attention Service Bulletin
737-71-1911, Revision 1, dated September 10, 2020, includes non-
mandatory information on how to contact General Aerospace for shipping
instructions for SDOS actuator part number BOE-2001-901F, although this
AD does not require the return of any parts. Further, the BOE-2001-901H
SDOS actuators can be changed to BOE-2001-901J SDOS actuators.
Conclusion
The FAA reviewed the relevant data, considered the comments
received, and determined that air safety and the public interest
require adopting this final rule with the changes described previously
and minor editorial changes. The FAA has determined that these minor
changes:
<bullet> Are consistent with the intent that was proposed in the
NPRM for addressing the unsafe condition; and
<bullet> Do not add any additional burden upon the public than was
already proposed in the NPRM.
The FAA also determined that these changes will not increase the
economic burden on any operator or increase the scope of this final
rule.
Related Service Information Under 1 CFR Part 51
The FAA reviewed Boeing Special Attention Requirements Bulletin
737-71-1911 RB, Revision 1, dated September 10, 2020. This service
information describes procedures for replacing each affected SDOS
actuator with a new SDOS actuator and verifying that safety markers are
installed. 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.
Costs of Compliance
The FAA estimates that this AD affects 400 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
Cost per Cost on U.S.
Action Labor cost Parts cost product operators
----------------------------------------------------------------------------------------------------------------
Replace SDOS actuator................. 5 work-hours x $85 per * $ * $425 * $170,000
hour = $425.
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* The FAA has received no definitive data that would enable the agency to provide parts cost estimates for the
actions specified in this proposed AD.
[[Page 40931]]
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 persons.
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.
Adoption of 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:
2021-13-18 The Boeing Company: Amendment 39-21623; Docket No. FAA-
2020-0333; Product Identifier 2020-NM-015-AD.
(a) Effective Date
This AD is effective September 3, 2021.
(b) Affected ADs
None.
(c) Applicability
This AD applies to all The Boeing Company Model 737 airplanes
powered by LEAP-1B engines, certificated in any category.
(d) Subject
Air Transport Association (ATA) of America Code 71, Powerplant.
(e) Unsafe Condition
This AD was prompted by reports of inadvertent release of the
spring energy of certain spring door opening system (SDOS)
actuators. The FAA is issuing this AD to address possible separation
of the SDOS actuator and visual obstruction of the SDOS actuator
safety marker, which, during maintenance, can cause injury to
maintenance personnel or damage to the airplane.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
For airplanes identified in Boeing Special Attention
Requirements Bulletin 737-71-1911 RB, Revision 1, dated September
10, 2020: At the applicable times specified in the ``Compliance''
paragraph of Boeing Special Attention Requirements Bulletin 737-71-
1911 RB, Revision 1, dated September 10, 2020, except as specified
by paragraph (h) of this AD, do all applicable actions identified
in, and in accordance with, the Accomplishment Instructions of
Boeing Special Attention Requirements Bulletin 737-71-1911 RB,
Revision 1, dated September 10, 2020.
Note 1 to paragraph (g): Guidance for accomplishing the actions
required by this AD can be found in Boeing Special Attention Service
Bulletin 737-71-1911, Revision 1, dated September 10, 2020, which is
referred to in Boeing Special Attention Requirements Bulletin 737-
71-1911 RB, Revision 1, dated September 10, 2020.
(h) Exception to Service Information Specifications
Where Boeing Special Attention Requirements Bulletin 737-71-1911
RB, Revision 1, dated September 10, 2020, uses the phrase ``the
original issue date of Requirements Bulletin 737-71-1911 RB,'' this
AD requires using ``the effective date of this AD.''
(i) Credit for Previous Actions
This paragraph provides credit for the actions specified in
paragraph (g) of this AD, if those actions were performed before the
effective date of this AD using Boeing Special Attention
Requirements Bulletin 737-71-1911 RB, dated November 26, 2019.
(j) Parts Installation Prohibition
As of the effective date of this AD, no person may install on
any airplane an SDOS actuator having part number BOE-2001-901F or
BOE-2001-901H.
(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 local Flight Standards District
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) of this AD. Information may be
emailed to: <a href="/cdn-cgi/l/email-protection#e7decaa6a9aacab4828693938b82caa6a4a8caa6aaa8a4cab582969282949394a7818686c9808891"><span class="__cf_email__" data-cfemail="30091d717e7d1d63555144445c551d71737f1d717d7f731d6255414555434443705651511e575f46">[email protected]</span></a>.
(2) Before using any approved AMOC, notify your appropriate
principal inspector, or lacking a principal inspector, the manager
of the local flight standards district office/certificate holding
district 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
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#b7c5d8c4d299dbd2d9f7d1d6d699d0d8c1"><span class="__cf_email__" data-cfemail="52203d21377c3e373c123433337c353d24">[email protected]</span></a>.
(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 Requirements Bulletin 737-71-1911
RB, Revision 1, dated September 10, 2020.
(ii) [Reserved]
(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>.
(4) You may view this service information at the FAA,
Airworthiness Products Section,
[[Page 40932]]
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, email <a href="/cdn-cgi/l/email-protection#95f3f0f1e7f0f2bbf9f0f2f4f9d5fbf4e7f4bbf2fae3"><span class="__cf_email__" data-cfemail="036566677166642d6f6664626f436d6271622d646c75">[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 June 18, 2021.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification
Service.
[FR Doc. 2021-16174 Filed 7-29-21; 8:45 am]
BILLING CODE 4910-13-P
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</html>Indexed from Federal Register on July 30, 2021.
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.