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Federal Register / Vol. 86, No. 139 / Friday, July 23, 2021 / Proposed Rules
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.

a Comments Due Date The FAA must receive comments on this airworthiness directive AD by September 7, 2021.

Regulatory Findings
d Subject Joint Aircraft Service Component JASC
Code: 6700, Rotorcraft Flight Control.

The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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, I certify this proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866, 2 Would not affect intrastate aviation in Alaska, and 3 Would 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 Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

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Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

Bell Textron Canada Limited Type Certificate Previously Held by Bell Helicopter Textron Canada Limited:
Docket No. FAA20210575; Project Identifier MCAI202000545R.

VerDate Sep<11>2014

16:27 Jul 22, 2021

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b Affected ADs None.
c Applicability This AD applies to Bell Textron Canada Limited type certificate previously held by Bell Helicopter Textron Canada Limited Model 429 helicopters, certificated in any category, serial numbers 57001 through 57210 inclusive, 57212 through 57344
inclusive, 57346 through 57371 inclusive, 57374 through 57377 inclusive, and 57380.

e Unsafe Condition This AD was prompted by reports of incorrectly staked spherical bearings in the directional control bellcrank assembly. The FAA is issuing this AD to address incorrectly staked spherical bearings in the directional control bellcrank assembly. This condition, if not addressed, could result in wear or elongation of the bore in the bellcrank, which could result in reduced helicopter directional control.
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.

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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, 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
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