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Federal Register / Vol. 86, No. 198 / Monday, October 18, 2021 / Rules and Regulations
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f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Inspection and Corrective Actions Within 25 hours time-in-service TIS or 90
days, whichever occurs first after the effective date of this AD: Inspect the lower surface of the spherical bearing on the directional control bellcrank assembly to determine if it is properly staked, in accordance with the Accomplishment Instructions, Part I, step 7., of Bell Alert Service Bulletin 4291950, Revision B, dated December 19, 2019 BASB 4291950, Revision B. After the inspection, before further flight, do the applicable action required by paragraph g1 or 2 of this AD.
1 If the lower surface of the spherical bearing is improperly staked any discrepancy is found e.g., the witness marks are not present and intact or the staked lip is not uniform along the chamfer: Inspect the bore in the bellcrank assembly for excessive wear including mechanical or corrosion damage that exceed 0.001 inch 0.03
millimeter maximum depth for 14 of the circumference, and any cracking; in accordance with the Accomplishment Instructions, Part I, steps 10. through 13., of BASB 4291950, Revision B, and depending on the findings, do the applicable actions required by paragraph g1i or ii of this AD before further flight.
i If the bore in the bellcrank assembly shows signs of excessive wear: Repair the bellcrank, including re-identifying the bellcrank assembly part number, in accordance with the Accomplishment Instructions, Part II, steps 1. through 13., of BASB 4291950, Revision B.
ii If the bore diameter is within 0.001
inch 0.03 millimeter maximum depth for 14
of the circumference: Install a new spherical bearing, in accordance with the Accomplishment Instructions, Part II, steps 4.
through 12., of BASB 4291950, Revision B.
2 If the lower surface of the spherical bearing is properly staked: Inspect the upper surface of the spherical bearing on the directional control bellcrank assembly to determine if it is properly staked, in accordance with the Accomplishment Instructions, Part I, steps 8. and 9., of BASB
4291950, Revision B, and depending on the findings, do the applicable actions required by paragraph g2i or ii of this AD before further flight.
i If the spherical bearing is properly staked: No further action is required by this AD.
ii If the spherical bearing is not properly staked any discrepancy is found e.g., the witness marks are not present and intact or the staked lip is not uniform along the chamfer: Inspect the bore in the bellcrank assembly for excessive wear including mechanical or corrosion damage that exceed 0.001 inch 0.03 millimeter maximum depth for 14 of the circumference, and any cracking, in accordance with the Accomplishment Instructions, Part I, steps 10. through 13., of BASB 4291950, Revision B, and depending on the findings,
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do the applicable actions required by paragraph g2iiA or B of this AD before further flight.
A If the bore in the bellcrank assembly shows signs of excessive wear: Repair the bellcrank, including re-identifying the bellcrank assembly part number, in accordance with the Accomplishment Instruction, Part II, steps 1. through 13., of BASB 4291950, Revision B.
B If the bore diameter is within 0.001
inch 0.03 millimeter maximum depth for 14
of the circumference: Install a new spherical bearing, in accordance with the Accomplishment Instructions, Part II, steps 4.
through 12., of BASB 4291950, Revision B.
h Required Post Repair Inspections For any helicopter on which the bellcrank has been repaired as required by paragraphs g1i or g2iiA of this AD: Within 100
hours TIS after the repair, and thereafter at intervals not to exceed 100 hours TIS, inspect the lower surface of the spherical bearing to determine if it has moved, in accordance with the Accomplishment Instructions, Part III, step 7., of BASB 4291950, Revision B.
If the spherical bearing has moved is loose:
Before further flight, inspect the bore in the bellcrank assembly to determine if the diameter exceeds 0.6283 inch 15.9588
millimeters, in accordance with the Accomplishment Instructions, Part III, steps 8. through 11., of BASB 4291950, Revision B.
1 If the diameter of the bore in the bellcrank assembly exceeds 0.6283 inch 15.9588 millimeters: Before further flight replace the bellcrank assembly.
2 If the diameter of the bore in the bellcrank assembly does not exceed 0.6283
inch 15.9588 millimeters: Before further flight install a new spherical bearing in accordance with the Accomplishment Instructions, Part II, steps 4. through 12., of BASB 4291950, Revision B.
i Terminating Action Replacement of a bellcrank assembly with a new part never installed on a helicopter or has accumulated zero hours TIS is terminating action for the requirements of this AD for that helicopter only.
j Credit for Previous Actions This paragraph provides credit for actions required by paragraph g of this AD, if those actions were performed before the effective date of this AD using the service information identified in paragraph j1 or 2 of this AD.
1 Bell Alert Service Bulletin 4291950, dated November 27, 2019.
2 Bell Alert Service Bulletin 4291950, Revision A, dated December 2, 2019.
k Alternative Methods of Compliance AMOCs 1 The Manager, International Validation 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 International Validation Branch, send it to the attention of the person
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identified in paragraph l1 of this AD.
Information may be emailed to: 9-AVS-AIR730-AMOC@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.
l Related Information 1 For more information about this AD, contact Andrea Jimenez, Aerospace Engineer, COS Program Management Section, Operational Safety Branch, Compliance &
Airworthiness Division, FAA, 1600 Stewart Ave., Suite 410, Westbury, NY 11590;
telephone 516 2287330; email andrea.jimenez@faa.gov.
2 Bell Alert Service Bulletin 4291950, dated November 27, 2019; and Bell Alert Service Bulletin 4291950, Revision A, dated December 2, 2019; which are not incorporated by reference, contain additional information about the subject of this AD.
This service information is available at the contact information specified in paragraphs m3 and 4 of this AD.
3 The subject of this AD is addressed in Transport Canada AD CF202011, dated April 16, 2020. You may view the Transport Canada AD at https www.regulations.gov in Docket No. FAA20210575.
m Material Incorporated by Reference 1 The Director of the Federal Register approved the incorporation by reference 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 Bell Alert Service Bulletin 4291950, Revision B, dated December 19, 2019.
ii Reserved 3 For Bell Helicopter service information identified in this AD, contact Bell Textron Canada Limited, 12,800 Rue de lAvenir, Mirabel, Quebec J7J 1R4, Canada; telephone 14504372862 or 18003638023; fax 1
4504330272; email productsupport@
bellflight.com; or at https
www.bellflight.com/support/contact-support.
4 You may view this service information at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX 76177. For information on the availability of this material at the FAA, call 817 2225110.
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: fr.inspection@nara.gov, or go to:
https www.archives.gov/federal-register/cfr/
ibr-locations.html.
Issued on September 16, 2021.
Ross Landes, Deputy Director for Regulatory Operations, Compliance & Airworthiness Division, Aircraft Certification Service.
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