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Federal Register / Vol. 86, No. 150 / Monday, August 9, 2021 / Proposed Rules
c Applicability This AD applies to The Boeing Company Model 7878, 7879, and 78710 airplanes, certificated in any category, powered by Rolls-Royce Trent 1000 engines.
d Subject Air Transport Association ATA of America Code 78, Thrust Reverser.
e Unsafe Condition This AD was prompted by reports of damage to the thrust reverser TR translating sleeve secondary sliders due to contact between the slider and the slider track liner.
This damage was only found on TR sleeves installed on certain engines. The FAA is issuing this AD to address this damage, which could result in failure of the TR
translating sleeve secondary slider and possible detachment of the outer cowl, which could strike the fuselage, causing damage to the airplane, and could result in reduced control or performance of the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.

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g Required Actions For airplanes with an original airworthiness certificate or original export certificate of airworthiness issued on or before the effective date 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 B78781205
SB78004300 RB, Issue 001, dated January 15, 2021, do all applicable actions for Group 1, Configuration 1 airplanes as identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin B78781205SB78004300 RB, Issue 001, dated January 15, 2021.
Note 1 to paragraph g: Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin B78781205SB78004300, Issue 001, dated January 15, 2021, which is referred to in Boeing Alert Requirements Bulletin B78781205SB78004300 RB, Issue 001, dated January 15, 2021.
h Exceptions to Service Information Specifications 1 Where Boeing Alert Requirements Bulletin B78781205SB78004300 RB, Issue 001, dated January 15, 2021, uses the phrase the issue 001 date of Requirements Bulletin B78781205SB78004300 RB, this AD
requires using the effective date of this AD.
2 Where Boeing Alert Requirements Bulletin B78781205SB78004300 RB, Issue 001, dated January 15, 2021, specifies contacting Boeing for repair instructions or for instructions to address certain conditions:
This AD requires doing the repair or doing the instructions using a method approved in accordance with the procedures specified in paragraph j of this AD.
i Parts Installation Limitations 1 As of the applicable compliance time specified in paragraph i1i or ii of this AD, no person may install on any airplane a
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TR with serial number between 00110001
and 00312001 inclusive, on which all applicable inspections and corrective actions required by paragraph g of this AD have not been accomplished.
i For airplanes with an original airworthiness certificate or original export certificate of airworthiness issued on or before the effective date of this AD: After accomplishing the actions required by paragraph g of this AD.
ii For airplanes with an original airworthiness certificate or original export certificate of airworthiness issued after the effective date of this AD: As of the effective date of this AD.
2 As of the applicable compliance time specified in paragraph i2i or ii of this AD, no person may install on any airplane a TR translating sleeve with serial number 00125001 and subsequent, on which all applicable inspections and corrective actions required by paragraph g of this AD have not been accomplished.
i For airplanes with an original airworthiness certificate or original export certificate of airworthiness issued on or before the effective date of this AD: After accomplishing the actions required by paragraph g of this AD.
ii For airplanes with an original airworthiness certificate or original export certificate of airworthiness issued after the effective date of this AD: As of the effective date of this AD.
3 As of the effective date of this AD, no person may install a TR translating sleeve that was originally installed on any airplane with an original airworthiness certificate or original export certificate of airworthiness issued after the effective date of this AD; or a TR translating sleeve with serial number 00125001 and subsequent, on which all applicable inspections and corrective actions specified in Boeing Alert Requirements Bulletin B78781205SB78004300 RB, Issue 001, dated January 15, 2021, have been accomplished; on any airplane with a TR
with a serial number between 00110001 and 00312001 inclusive, unless all applicable inspections and corrective actions specified in Boeing Alert Requirements Bulletin B787
81205SB78004300 RB, Issue 001, dated January 15, 2021, have been accomplished on that TR, except as specified in paragraph h2 of this AD.
j 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 Related Information.
Information may be emailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov.
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,
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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.
k Related Information 1 For more information about this AD, contact Tak Kobayashi, Aerospace Engineer, Propulsion Section, FAA, Seattle ACO
Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 2062313553;
email: takahisa.kobayashi@faa.gov.
2 For service information identified in this AD, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services C&DS, 2600 Westminster Blvd., MC 110SK57, Seal Beach, CA 907405600;
telephone 5627971717; internet https
www.myboeingfleet.com. You may view this referenced 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 2062313195.
Issued on July 13, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202116680 Filed 8621; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210213; Project Identifier 2018CE036AD
RIN 2120AA64

Airworthiness Directives; Pacific Aerospace Limited Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

The FAA proposes to adopt a new airworthiness directive AD for certain Pacific Aerospace Limited Model 750XL airplanes. This proposed AD results from mandatory continuing airworthiness information MCAI
originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI identifies the unsafe condition as insufficient separation of ground terminations for individual power sources and static grounds. This proposed AD would require inspecting and separating, if applicable, the battery
SUMMARY:

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