Rule2023-06075
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
March 27, 2023
Effective
May 1, 2023
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 737-8 and 737-9 airplanes, and certain Model 737- 600, -700, -700C, -800, -900, and -900ER series airplanes. This AD was prompted by reports of damage to the auxiliary power unit (APU) fuel line shroud located aft of the aft cargo area; investigation revealed that the placement of the pressure switch wire clamp assembly and its fastener allowed interference of the fastener against the APU fuel line shroud. This AD requires inspecting the APU fuel line shroud for damage, inspecting the pressure switch wire clamp for correct bolt orientation and horizontal distance from the APU fuel line shroud, and applicable on-condition actions. The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 88 Issue 58 (Monday, March 27, 2023)</title>
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[Federal Register Volume 88, Number 58 (Monday, March 27, 2023)]
[Rules and Regulations]
[Pages 18011-18016]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2023-06075]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2022-1068; Project Identifier AD-2022-00358-T;
Amendment 39-22364; AD 2023-04-17]
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
certain Boeing Model 737-8 and 737-9 airplanes, and certain Model 737-
600, -700, -700C, -800, -900, and -900ER series airplanes. This AD was
prompted by reports of damage to the auxiliary power unit (APU) fuel
line shroud located aft of the aft cargo area; investigation revealed
that the placement of the pressure switch wire clamp assembly and its
fastener allowed interference of the fastener against the APU fuel line
shroud. This AD requires inspecting the APU fuel line shroud for
damage, inspecting the pressure switch wire clamp for correct bolt
orientation and horizontal distance from the APU fuel line shroud, and
applicable on-condition actions. The FAA is issuing this AD to address
the unsafe condition on these products.
DATES: This AD is effective May 1, 2023.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of May 1, 2023.
ADDRESSES:
AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2022-1068; or in person at Docket Operations between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD
docket contains this final rule, any comments received, and other
information. The address for Docket Operations is U.S. Department of
Transportation, Docket Operations, M-30, West Building Ground Floor,
Room W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590.
Material Incorporated by Reference:
<bullet> For 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="http://myboeingfleet.com">myboeingfleet.com</a>.
<bullet> 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="http://regulations.gov">regulations.gov</a> under Docket No. FAA-2022-1068.
FOR FURTHER INFORMATION CONTACT: Chris Baker, Aerospace Engineer,
Propulsion Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des
Moines, WA 98198; phone: 206-231-3552; email:
<a href="/cdn-cgi/l/email-protection#3d5e554f544e49524d55584f134f135f5c56584f7d5b5c5c135a524b"><span class="__cf_email__" data-cfemail="4a29223823393e253a222f38643864282b212f380a2c2b2b642d253c">[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 Boeing Model
737-8 and 737-9 airplanes, and certain Model 737-600, -700, -700C, -
800, -900, and -900ER series airplanes. The NPRM
[[Page 18012]]
published in the Federal Register on October 5, 2022 (87 FR 60347). The
NPRM was prompted by reports of damage to the auxiliary power unit
(APU) fuel line shroud located aft of the aft cargo area; investigation
revealed that the placement of the pressure switch wire clamp assembly
and its fastener allowed interference of the fastener against the APU
fuel line shroud. In the NPRM, the FAA proposed to require inspecting
the APU fuel line shroud for damage, inspecting the pressure switch
wire clamp for correct bolt orientation and horizontal distance from
the APU fuel line shroud, and applicable on-condition actions. The FAA
is issuing this AD to address interference of the fastener against the
APU fuel line shroud, possibly resulting in a damaged APU fuel line
shroud and consequent failure of the APU fuel hose, which could result
in a flammable fluid leak in an ignition zone.
Discussion of Final Airworthiness Directive
Comments
The FAA received a comment from The Air Line Pilots Association,
International (ALPA), who supported the NPRM without change.
The FAA received a comment from Aviation Partners Boeing (APB), who
has reviewed the NPRM and determined that the incorporation of STC
ST00830SE for installation of blended or split scimitar winglets on
Boeing 737NG airplanes does not affect compliance with the mandated
actions in the proposed rule. APB supported the NPRM without change.
The FAA received additional comments from Erick Leon, Delta Air
Lines (DAL), Southwest Airlines (SWA), Boeing, and American Airlines
(AAL). The following presents the comments received on the NPRM and the
FAA's response to each comment.
Request To Update Service Information
Eric Leon requested that the procedure for installing the wire
clamp should be updated to prevent the fuel line shroud from being
damaged. The commenter noted that APU manufacturers should be required
to make necessary corrections on the installation requirements for APU
fuel line shroud. Lastly, the commenter stated that it would be
important to understand what regulations are doing to ensure
installation requirements meet minimum safety requirements set by the
FAA.
The FAA does not agree with the requested change by the commenter.
As discussed in the NPRM, incorrect installation of the fastener of the
pressure switch wire clamp allowed interference of the fastener against
the APU fuel line shroud. This installation activity occurred as part
of airplane production, and is not an area intended to be covered by
the APU manufacturer's design or installation instructions. To address
this issue, the Boeing Alert Requirements Bulletins mandated by this AD
require an inspection to determine the orientation of the fastener
installed for the pressure switch wire clamp. If the fastener is not
installed correctly, it must be reinstalled according to the procedures
provided by the Boeing Alert Requirements Bulletins. Correct
installation of the fastener will eliminate the potential of the
fastener contacting the APU fuel line shroud and prevent occurrences of
damage to the APU fuel line shroud. Furthermore, the correct
installation specified in the Boeing Alert Requirements Bulletins
complies with applicable regulations and therefore meets the minimum
FAA safety requirements. The FAA has not changed this AD in response to
this comment.
Request To Include Revisions of Boeing Alert Requirements Bulletins
DAL, AAL, and Boeing asked to revise the AD to require new
revisions of service information that Boeing is currently drafting.
Boeing noted that they are drafting revisions to Boeing Alert
Requirements Bulletin 737-38A1072 RB, dated February 25, 2022, and
Boeing Alert Requirements Bulletin 737-38A1073 RB, dated February 25,
2022, to address the condition of a missing clamp. As an alternative,
AAL asked the FAA to consider allowing ``later approved revisions'' of
the service information.
The FAA acknowledges the commenters' concerns regarding the
procedures in the service information involving a potential missing
clamp. In light of the critical nature of the identified unsafe
condition, the FAA does not consider it appropriate to delay this final
rule until new service information is available. Revisions of Boeing
Alert Requirements Bulletins 737-38A1072 RB and 737-38A1073 RB have not
been submitted to the FAA for review and approval. Therefore, the FAA
is unable to mandate those revisions as requested. Furthermore, we
disagree to add a provision to the AD to allow the use of ``later
approved revisions'' of the Boeing Alert Requirements Bulletins. The
FAA can only mandate a published document since the mandated document
becomes part of the AD as it is incorporated by reference. Therefore,
we are unable to mandate a ``later revision'' that does not exist at
the time of AD publication. The FAA has not changed this AD in response
to this comment.
Request To Provide Allowances for On-Wing Repairs of Damage to the APU
Fuel Line Shroud
DAL requested to provide allowances for on-wing repairs of damage
to the APU fuel line shroud. DAL noted that any crack or hole found on
the APU fuel line shroud or any damage which exposes bare metal on the
APU fuel line shroud exceeding the blend-out limits requires replacing
the existing shroud with a new or repaired shroud. DAL explained that
the action of removing and re-installing the shroud represents a
significant maintenance burden, estimated at up to 300 labor hours as
noted in the Costs of Compliance/On-Condition Costs of the NPRM. DAL
noted that they are aware of on-wing repair actions for similar damage
on other aircraft models, which would alleviate the need for shroud
removal, potentially reducing repair labor hours to approximately 20
labor hours.
The FAA does not agree with the requested change by DAL. The FAA is
unable to provide allowances for on-wing repairs of the damaged APU
fuel line shroud since such repair procedures are not provided in the
service information mandated by this AD. However, if an alternative
procedure is available that would provide an acceptable level of
safety, such a procedure can be requested for FAA approval through the
provisions of paragraph (i) of this AD. The FAA has not changed this AD
in response to this comment.
Request Regarding Parts Availability
DAL's review of parts availability from information on
MyBoeingFleet Part Page shows zero stock of MPN 346A2201-26 APU Fuel
Line Shroud as of October 5, 2022, with one part expected to be
available by June 25, 2023. The subject MPN 346A2201-26 is applicable
to approximately 100 DAL 737-900ER aircraft. DAL stated lack of
availability of this part could severely hamper their ability to comply
with this AD in the time period proposed.
According to DAL, Boeing has advised DAL that they have what they
believe to be an adequate number of MPN 346A2201-26 shrouds available,
however these are under allocation control by Boeing. This condition
minimizes an operator's ability to effectively plan for proper
contingencies should a shroud require replacement as the operator will
have to delay repair actions while awaiting Boeing to release
[[Page 18013]]
and ship the part to the operator potentially delaying aircraft return
to service. DAL stated that if an AD will mandate this action, parts
must be available to accomplish the requirements under paragraph (g) of
the proposed AD.
The FAA agrees to provide clarification. When the FAA assesses
unsafe conditions and establishes compliance times for ADs, the agency
accounts for the practical aspects associated with compliance,
including parts availability. As indicated by the commenter, the
manufacturer considers that parts availability will be adequate.
Similarly, the FAA has not been informed of a potential shortage of
necessary parts. Therefore, the FAA considers that the compliance time
of three years is adequate for operators to acquire the necessary parts
and accomplish the actions required by this AD. The FAA has not changed
this AD in response to this comment.
Request To Include an Inspection for Clamp Presence as First Action and
in Figure 2 of Boeing Alert Service Bulletin
DAL requested to include an inspection for clamp presence as the
first action rather than current ACTION 1, mandated per paragraph
(g)(1) of the proposed AD under Boeing Alert Requirements Bulletin 737-
38A1072 RB, dated February 25, 2022. If the clamp is not installed, DAL
requests a requirement to install the clamp prior to any work being
performed. DAL also stated that Figure 2, sheet 3 of 4 of Boeing Alert
Requirements Bulletin 737-38A1072 RB, dated February 25, 2022, should
have a provision to inspect for the missing clamp prior to any work
being performed. DAL suggested an additional paragraph be added to
inspect for the missing clamp. DAL stated that if the final rule
continues to require accomplishment of the Boeing Alert Requirements
Bulletin rather than the forthcoming revision, ACTION 1 to establish
inspection within 3 inches of the clamp cannot be accomplished if clamp
is not present. Therefore, an inspection for the presence of the clamp
must be done first. Then, installation of the clamp and the inspection
included in ACTION 1 can be performed.
The FAA does not agree with the requested changes by DAL. As stated
previously, in light of the critical nature of the identified unsafe
condition, the FAA does not consider it appropriate to delay this final
rule until new service information is available. In addition, a
pressure switch wire clamp should be present at the location specified
in the service information mandated by the AD in order for an airplane
to conform to the type design. We have not received any reports from
the manufacturer regarding airplanes delivered with a missing pressure
switch wire clamp. Also, we have not received any reports regarding the
potential of the pressure switch wire clamp failing in service.
Therefore, we consider that the instructions provided in the service
information are adequate to address the unsafe condition. If an
operator discovers an airplane with a missing pressure switch wire
clamp during the accomplishment of the service information, we
recommend that the operator inform the manufacturer of that condition.
Operators may also request an Alternative Method of Compliance (AMOC)
using the provisions in paragraph (i) of this AD if necessary. The FAA
has not changed this AD in response to this comment.
Request To Clarify an Airplane Maintenance Manual (AMM) Reference
DAL requested to clarify the AMM reference in Boeing Alert
Requirements Bulletin 737-38A1072 RB, dated February 25, 2022, Part 2
for APU Fuel line shroud removal/installation to indicate the MAIN APU
fuel line shroud. DAL stated the AMM 28-25-05 has two shroud removal
procedures--MAIN and AFT. In AMM 28-25-05/401, step 1.C notes that the
APU shroud is divided into 2 parts with the main shroud being the one
between the center tank and the pressure bulkhead, which is the subject
of Boeing Alert Requirements Bulletin 737-38A1072 RB, dated February
25, 2022, and the NPRM.
The FAA agrees that the AMM reference should be clarified to
reflect the intent of the AD, which is to replace the Main APU fuel
line shroud only. However, the procedures in the Boeing Alert Service
Bulletin (SB) that refer to AMM 28-25-05 are not required for
compliance with this AD, and therefore those procedures are not
provided in the Boeing Alert Requirements Bulletin (RB). As stated in
Note 1 to paragraph (g)(1) and Note 2 to paragraph (g)(2) of this AD,
the Boeing Alert Service Bulletins (SB) provide guidance for
accomplishing the actions required by this AD. The FAA has not changed
this AD in response to this comment.
Request for Additional Instructions in Boeing Alert Requirements
Bulletin
DAL stated that Boeing Alert Requirements Bulletin 737-38A1072 RB,
dated February 25, 2022, Part 3, step 1.a. includes verbiage to ensure
the damage is smoothed out and should not exceed 2 inches in length.
DAL suggested an additional paragraph be provided to instruct operators
to replace the existing shroud should the smoothing process require
more than 2 inches. For Part 3, step 1.a., DAL stated there is no
guidance should the smoothing be longer than 2 inches.
Additionally, DAL stated that Boeing Alert Requirements Bulletin
737-38A1072 RB, dated February 25, 2022, Part 3, step 1.b. indicates to
not remove more than 0.018 inches of metal from the wall thickness. For
Part 3, step 1.b., DAL stated there is no guidance should more than
0.018 inches of metal be removed.
The FAA does not agree with the requested changes by DAL. Although
additional clarification as suggested by the commenter may be
beneficial to operators, the FAA considers that the specific steps in
the Requirements Bulletin (RB) are adequate to address the unsafe
condition. Part 3 of the Service Bulletin (SB) provides one acceptable
method of compliance. Part 3 of the SB provides an option to repair
damage to the existing APU fuel line shroud. If the blend surface
exceeds 2 inches, or if more than 0.018 inch of metal is removed from
the wall thickness, the conditions required by Part 3 cannot be met,
and therefore this option should not be taken. In this case, the FAA
recommends the operator to follow the option provided by Part 2, which
is to replace the APU fuel line shroud with a new or repaired shroud.
As we clarified previously, the procedures identified by the commenter
are not part of the Requirements Bulletin, and therefore are not
required by this AD. Those procedures are provided in the Service
Bulletin as guidance for accomplishing the actions required by this AD.
The FAA has not changed this AD in response to this comment.
Request To Use Serviceable Parts
SWA stated the ``Action'' column of Table 1 in Boeing Alert
Requirements Bulletin 737-38A1072 RB, dated February 25, 2022, and
Boeing Alert Requirements Bulletin 737-38A1073 RB, dated February 25,
2022, specifies ``Replace existing APU fuel line shroud with new or
repaired shroud.'' For Condition 1, Condition 2 (Option 2), and
Condition 3, SWA requested clarification regarding the use of an APU
fuel line shroud which is not ``new or repaired,'' but is otherwise in
serviceable condition. We infer SWA requested that the FAA allow an
option to use serviceable parts.
The FAA agrees with the requested change by SWA. The service
instructions should allow for
[[Page 18014]]
serviceable parts, not just ``new or repaired'' shrouds. This AD allows
the installation of a ``serviceable'' APU fuel line shroud. A
``serviceable'' APU fuel line shroud is defined as an APU fuel line
shroud that has been maintained using methods acceptable to the FAA and
identified by the FAA as airworthy. The FAA has added paragraphs (h)(3)
and (4) to this AD to include this information.
Request To Clarify the Location of the APU Fuel Line Shroud Damage
Boeing requested to clarify the location of the APU fuel line
shroud damage. Boeing proposed to revise paragraph (e) of the NPRM to
change the statement from: ``This AD was prompted by reports of damage
to the auxiliary power unit (APU) fuel line shroud located in the aft
cargo area'' to: ``This AD was prompted by reports of damage to the
auxiliary power unit (APU) fuel line shroud located aft of the aft
cargo area.'' This will more precisely describe the location of the APU
fuel line shroud damage that was found.
The FAA agrees with the requested change by Boeing because it
better describes the location of the APU fuel line shroud. The FAA has
changed the SUMMARY, Background, and paragraph (e) of this AD as
requested.
Conclusion
The FAA reviewed the relevant data, considered any comments
received, and determined that air safety requires adopting this AD as
proposed. Accordingly, the FAA is issuing this AD to address the unsafe
condition on these products. Except for minor editorial changes, and
any other changes described previously, this AD is adopted as proposed
in the NPRM. None of the changes will increase the economic burden on
any operator.
Related Service Information Under 1 CFR Part 51
The FAA reviewed Boeing Alert Requirements Bulletins 737-38A1072 RB
and 737-38A1073 RB, both dated February 25, 2022. This service
information specifies procedures for a general visual inspection of the
APU fuel line shroud in the area within 3 inches of the fastener of the
pressure switch wire clamp for any damage (any crack or hole, any
damage that exposes bare metal on the APU fuel line shroud, and any
dent damage found that decreases the outside diameter of the shroud by
more than 0.031 inch); a detailed inspection of the pressure switch
wire clamp to determine if the fastener of the pressure switch wire
clamp is installed with the bolt head on top and the nut on the bottom,
and that there is a minimum 1.5 inches of horizontal separation between
the fastener of the pressure switch wire clamp and the APU fuel line
shroud, and applicable on-condition actions. On-condition actions
include replacing the existing APU fuel line shroud with a new or
repaired shroud; repairing any damage to the APU fuel line shroud;
reinstalling the fastener of the pressure switch wire clamp with the
bolt head on top and the nut on the bottom; and reinstalling the
pressure switch wire clamp assembly to make sure there is 1.5 inches
minimum of horizontal separation between the fastener of the pressure
switch wire clamp and the APU fuel line shroud. These documents are
distinct since they apply to different airplane minor models. 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 1,919 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
Estimated Costs
----------------------------------------------------------------------------------------------------------------
Cost per Cost on U.S.
Action Labor cost Parts cost product operators
----------------------------------------------------------------------------------------------------------------
One-time Inspections................ 2 work-hours x $85 per $0 $170 $326,230
hour = $170.
----------------------------------------------------------------------------------------------------------------
The FAA estimates the following costs to do any necessary repairs,
replacements, or re-installations that would be required based on the
results of the inspection. The agency has no way of determining the
number of aircraft that might need these repairs, replacements, or re-
installations:
On-Condition Costs
----------------------------------------------------------------------------------------------------------------
Action Labor cost Parts cost Cost per product
----------------------------------------------------------------------------------------------------------------
Repair........................... Up to 3 work-hours x $0....................... Up to $255.
$85 per hour = Up
to $255.
Replacement (includes re- Up to 300 work-hours Up to $8,158............. Up to $33,658.
installation). x $85 per hour = Up
to $25,500.
----------------------------------------------------------------------------------------------------------------
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.
[[Page 18015]]
For the reasons discussed above, I certify that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Will not affect intrastate aviation in Alaska, and
(3) Will not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
The Amendment
Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39--AIRWORTHINESS DIRECTIVES
0
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
0
2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive:
2023-04-17 The Boeing Company: Amendment 39-22364; Docket No. FAA-
2022-1068; Project Identifier AD-2022-00358-T.
(a) Effective Date
This airworthiness directive (AD) is effective May 1, 2023.
(b) Affected ADs
None.
(c) Applicability
This AD applies to The Boeing Company airplanes identified in
paragraphs (c)(1) and (2) of this AD, certificated in any category.
(1) Model 737-600, -700, -700C, -800, -900, and -900ER series
airplanes, as identified in Boeing Alert Requirements Bulletin 737-
38A1072 RB, dated February 25, 2022.
(2) Model 737-8 and 737-9 airplanes, as identified in Boeing
Alert Requirements Bulletin 737-38A1073 RB, dated February 25, 2022.
(d) Subject
Air Transport Association (ATA) of America Code 28, Fuel.
(e) Unsafe Condition
This AD was prompted by reports of damage to the auxiliary power
unit (APU) fuel line shroud located aft of the aft cargo area;
investigation revealed that the placement of the pressure switch
wire clamp assembly and the fastener allowed interference of the
fastener against the APU fuel line shroud. The FAA is issuing this
AD to address interference of the fastener against the APU fuel line
shroud, possibly resulting in a damaged APU fuel line shroud and
consequent failure of the APU fuel hose, which could result in a
flammable fluid leak in an ignition zone.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
(1) For the airplanes identified in paragraph (c)(1) of this AD,
except as specified by paragraph (h) of this AD: At the applicable
times specified in the ``Compliance'' paragraph of Boeing Alert
Requirements Bulletin 737-38A1072 RB, dated February 25, 2022, do
all applicable actions identified in, and in accordance with, the
Accomplishment Instructions of Boeing Alert Requirements Bulletin
737-38A1072 RB, dated February 25, 2022.
Note 1 to paragraph (g)(1): Guidance for accomplishing the
actions required by this AD can be found in Boeing Alert Service
Bulletin 737-38A1072, dated February 25, 2022, which is referred to
in Boeing Alert Requirements Bulletin 737-38A1072 RB, dated February
25, 2022.
(2) For the airplanes identified in paragraph (c)(2) of this AD,
except as specified by paragraph (h) of this AD: At the applicable
times specified in the ``Compliance'' paragraph of Boeing Alert
Requirements Bulletin 737-38A1073 RB, dated February 25, 2022, do
all applicable actions identified in, and in accordance with, the
Accomplishment Instructions of Boeing Alert Requirements Bulletin
737-38A1073 RB, dated February 25, 2022.
Note 2 to paragraph (g)(2): Guidance for accomplishing the
actions required by this AD can be found in Boeing Alert Service
Bulletin 737-38A1073, dated February 25, 2022, which is referred to
in Boeing Alert Requirements Bulletin 737-38A1073 RB, dated February
25, 2022.
(h) Exceptions to Service Information Specifications
(1) Where the Compliance Time columns of the tables in the
``Compliance'' paragraphs of Boeing Alert Requirements Bulletin 737-
38A1072 RB, dated February 25, 2022, use the phrase ``the original
issue date of Requirements Bulletin 737-38A1072 RB,'' this AD
requires using ``the effective date of this AD.''
(2) Where the Compliance Time columns of the tables in the
``Compliance'' paragraphs of Boeing Alert Requirements Bulletin 737-
38A1073 RB, dated February 25, 2022, use the phrase ``the original
issue date of Requirements Bulletin 737-38A1073 RB,'' this AD
requires using ``the effective date of this AD.''
(3) Where the Action column in Table 1 of Boeing Alert
Requirements Bulletin 737-38A1072 RB, dated February 25, 2022, uses
the phrase ``Replace existing APU fuel line shroud with new or
repaired shroud,'' this AD allows the installation of a
``serviceable'' APU fuel line shroud. A ``serviceable'' APU fuel
line shroud is defined as an APU fuel line shroud that has been
maintained using methods acceptable to the FAA and identified by the
FAA as airworthy.
(4) Where the Action column in Table 1 of Boeing Alert
Requirements Bulletin 737-38A1073 RB, dated February 25, 2022, uses
the phrase ``Replace existing APU fuel line shroud with new or
repaired shroud,'' this AD allows the installation of a
``serviceable'' APU fuel line shroud. A ``serviceable'' APU fuel
line shroud is defined as an APU fuel line shroud that has been
maintained using methods acceptable to the FAA and identified by the
FAA as airworthy.
(i) 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 (j) of this AD. Information may be emailed
to: <a href="/cdn-cgi/l/email-protection#50697d111e1d7d03353124243c357d11131f7d111d1f137d0235212535232423103631317e373f26"><span class="__cf_email__" data-cfemail="053c28444b4828566064717169602844464a2844484a46285760747060767176456364642b626a73">[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.
(j) Related Information
For more information about this AD, contact Chris Baker,
Aerospace Engineer, Propulsion Section, FAA, Seattle ACO Branch,
2200 South 216th St., Des Moines, WA 98198; phone: 206-231-3552;
email: <a href="/cdn-cgi/l/email-protection#1d7e756f746e69726d75786f336f337f7c76786f5d7b7c7c337a726b"><span class="__cf_email__" data-cfemail="66050e140f151209160e031448144804070d03142600070748010910">[email protected]</span></a>.
(k) 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 Alert Requirements Bulletin 737-38A1072 RB, dated
February 25, 2022.
(ii) Boeing Alert Requirements Bulletin 737-38A1073 RB, dated
February 25, 2022.
(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="http://myboeingfleet.com">myboeingfleet.com</a>.
(4) You may view this service information at the FAA,
Airworthiness Products Section, Operational Safety Branch, 2200
South 216th
[[Page 18016]]
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#9dfbefb3f4f3eeedf8fee9f4f2f3ddf3fceffcb3faf2eb"><span class="__cf_email__" data-cfemail="f49286da9d9a87849197809d9b9ab49a958695da939b82">[email protected]</span></a>, or go to: <a href="http://www.archives.gov/federal-register/cfr/ibr-locations.html">www.archives.gov/federal-register/cfr/ibr-locations.html</a>.
Issued on February 22, 2023.
Christina Underwood,
Acting Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2023-06075 Filed 3-24-23; 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 March 27, 2023.
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.