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Federal Register / Vol. 86, No. 35 / Wednesday, February 24, 2021 / Rules and Regulations
Structural Inspection Document D6480401, Volume II, Temporary Revision 111001, dated February 2020.
2 At the applicable time specified in paragraph g2i or ii of this AD, perform initial inspections to detect cracks in the SSIs identified in Boeing 727 Supplemental Structural Inspection Document D6480401, Volume I, Temporary Revision 081001, dated February 2020; and Boeing 727
Supplemental Structural Inspection Document D6480401, Volume II, Temporary Revision 111001, dated February 2020.
i For Model 727100C and 727200F
series airplanes: Inspect prior to the accumulation of 46,000 total flight cycles, or within 12 months after the effective date of this AD, whichever occurs later.
ii For all airplanes except for those airplanes identified in paragraph g2i of this AD: Inspect prior to the accumulation of 55,000 total flight cycles, or within 3,000
flight cycles measured from the date 12
months after the effective date of this AD, whichever occurs later.
3 At the intervals specified in in Boeing 727 Supplemental Structural Inspection Document D6480401, Volume I, Temporary Revision 081001, dated February 2020; and Boeing 727 Supplemental Structural Inspection Document D6480401, Volume II, Temporary Revision 111001, dated February 2020, as applicable, repeat the inspections required by paragraph g2
of this AD.
4 If any cracked structure is found during any inspections required by paragraph g of this AD, repair before further flight using an FAA-approved method or using a method approved in accordance with the procedures specified in paragraph j of this AD. Within 12 months after repair, incorporate a revision into the maintenance or inspection program, as applicable, to include a damage-tolerancebased alternative inspection program for the repaired structure. Thereafter, inspect the affected structure in accordance with the alternative program. The inspection method and compliance times i.e., threshold and repetitive intervals of the alternative program must be approved in accordance with the procedures specified in paragraph j of this AD.

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h No Alternative Actions or Intervals After the existing maintenance or inspection program has been revised as required by paragraph g1 of this AD, no alternative actions e.g., inspections or intervals may be used unless the actions or intervals are approved as an alternative method of compliance AMOC in accordance with the procedures specified in paragraph j of this AD.
i Terminating Action for Certain Inspections Required by AD 981103 R1
Accomplishing the revision required by paragraph g1 of this AD and the initial inspections identified in Boeing 727
Supplemental Structural Inspection Document D6480401, Volume I, Temporary Revision 081001, dated February 2020; and Boeing 727 Supplemental Structural Inspection Document D6480401,
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Volume II, Temporary Revision 111001, dated February 2020, as required by paragraph g2 of this AD, terminate the corresponding SSI inspections specified in Boeing Document No. D6480401, Volumes 1 and 2, Supplemental Structural Inspection Document SSID, Revision H, dated June 1994, as required by AD 981103 R1.
j Alternative Methods of Compliance AMOCs 1 The Manager, Los Angeles 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 k of this AD. Information may be emailed to: 9-ANMLAACO-AMOC-Requests@faa.gov.
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, Los Angeles 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.
4 AMOCs approved previously for AD
981103 R1 are approved as AMOCs for the corresponding provisions of this AD for the SSIs identified in Boeing 727 Supplemental Structural Inspection Document D6480401, Volume I, Temporary Revision 081001, dated February 2020; and Boeing 727
Supplemental Structural Inspection Document D6480401, Volume II, Temporary Revision 111001, dated February 2020.
k Related Information For more information about this AD, contact Mohit Garg, Aerospace Engineer, Airframe Section, FAA, Los Angeles ACO
Branch, 3960 Paramount Boulevard, Lakewood, CA 907124137; phone: 562627
5264; fax: 5626275210; email: mohit.garg@
faa.gov.
l 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. 552a 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 727 Supplemental Structural Inspection Document D6480401, Volume I, Temporary Revision 081001, dated February 2020.
ii Boeing 727 Supplemental Structural Inspection Document D6480401, Volume
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II, Temporary Revision 111001, dated February 2020.
3 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.
4 You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 2062313195.
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 fedreg.legal@nara.gov, or go to: https
www.archives.gov/federal-register/cfr/ibrlocations.html.
Issued on January 28, 2021.
Gaetano A. Sciortino, Deputy Director for Strategic Initiatives, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202103598 Filed 22321; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20200859; Product Identifier 2020NM084AD; Amendment 3921413; AD 20210310
RIN 2120AA64

Airworthiness Directives; Bombardier, Inc., Airplanes Federal Aviation Administration FAA, Department of Transportation DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for certain Bombardier, Inc., Model BD1001A10
airplanes. This AD was prompted by reports of failure of a certain fire detection and extinguishing FIREX
control unit. This AD requires replacing FIREX control units having a certain part number. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective March 31, 2021.
The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD
as of March 31, 2021.
ADDRESSES: For service information identified in this final rule, contact Bombardier, Inc., 200 Cote Vertu Road SUMMARY:

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