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Federal Register / Vol. 86, No. 139 / Friday, July 23, 2021 / Proposed Rules condition for Bell Textron Canada Limited Bell Model 429 helicopters, serial numbers 57001 through 57210, 57212 through 57344, 57346 through 57371, 57374 through 57377, and 57380.
Transport Canada advises that there are reports of 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.
Accordingly, Transport Canada AD
CF202011 requires a one-time inspection to determine if a spherical bearing is properly staked in the directional control bellcrank assembly, and, depending on the findings, replacement of the spherical bearing with a new spherical bearing, repair of an affected bellcrank assembly and repetitive inspections of that repaired bellcrank assembly, or replacement of the affected bellcrank assembly with a serviceable part. Transport Canada AD
CF202011 also provides terminating actions for the requirements of the Canadian AD.
FAAs Determination These helicopters have been approved by the aviation authority of Canada and are approved for operation in the United States. Pursuant to the FAAs bilateral agreement with Canada, Transport Canada, its technical representative, has notified the FAA of the unsafe condition described in its AD. The FAA is proposing this AD after evaluating all known relevant information and determining that the unsafe condition described previously is likely to exist or
develop on other helicopters of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Bell Alert Service Bulletin 4291950, Revision B, dated December 19, 2019. This service information specifies procedures for an initial inspection of the lower surface of the spherical bearing in the directional control bellcrank assembly to determine if it is properly staked, additional inspections, and corrective actions. The corrective actions include installation of a new spherical bearing, repair including re-identification of the bellcrank assembly part number, and replacement of the bellcrank assembly.
The additional inspections include an inspection of the upper surface of the spherical bearing in the directional control bellcrank assembly to determine if it is properly staked, an inspection of 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; and, for any helicopter with a bellcrank assembly that is repaired, repetitive inspections of the lower surface of the spherical bearing to determine if it has moved.
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 the ADDRESSES section.
Other Related Service Information The FAA also reviewed Bell Alert Service Bulletin 4291950, dated
November 27, 2019; and Revision A, dated December 2, 2019. Bell Alert Service Bulletin 4291950, dated November 27, 2019, specifies procedures for an initial inspection of the spherical bearing in the directional control bellcrank assembly to determine if it is properly staked and replacement of the spherical bearing with a new spherical bearing if it is determined that the spherical bearing was not properly staked.
Bell Alert Service Bulletin 4291950, Revision A, dated December 2, 2019, specifies procedures for an initial inspection of the lower surface of the spherical bearing in the directional control bellcrank assembly to determine if it is properly staked, additional inspections, and corrective actions. The corrective actions include installation of a new spherical bearing. The additional inspections include an inspection of the upper surface of the spherical bearing in the directional control bellcrank assembly to determine if it is properly staked, and an inspection of the bore in the bellcrank assembly for excessive wear.
Proposed AD Requirements in This NPRM
This proposed AD would require accomplishing the actions specified in the service information already described.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 120
helicopters of U.S. registry. The FAA
estimates the following costs to comply with this proposed AD:

ESTIMATED COSTS
Action
Labor cost
Inspection

1 work-hour $85 per hour = $85 per inspection cycle

The FAA estimates the following costs to do any necessary actions that would be required based on the results
Cost per product
Parts cost
of the proposed inspection. The agency has no way of determining the number
$0

Cost on U.S.
operators
$85

$10,200

of helicopters that might need these actions:

khammond on DSKJM1Z7X2PROD with PROPOSALS

ON-CONDITION COSTS
Action
Labor cost
Replacement Spherical Bearing
Repair/replacement Bellcrank
Repetitive Inspections

7 work-hours $85 per hour = $595
4 work-hours $85 per hour = $340
1 work-hour $85 per hour = $85 per inspection cycle.

Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs authority to issue
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Parts cost
rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII:

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$56
2,856
0

Cost per product $651.
3,196.
85 per inspection cycle.

Aviation Programs, describes in more detail the scope of the Agencys authority.

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