Federal Register - March 25, 2021
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Source: Federal Register
15786
Federal Register / Vol. 86, No. 56 / Thursday, March 25, 2021 / Rules and Regulations
work performed. That description should identify the same information specified in step 4B11.
The FAA did not change this AD
based on this comment.
Conclusion The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting this AD as proposed.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. Except for minor editorial changes, and any other changes described previously, this AD is adopted as proposed in the NPRM.
None of the changes will increase the economic burden on any operator.
Related Service Information Under 1
CFR Part 51
Differences Between the AD and the Service Information
The FAA reviewed Air Tractor, Inc.
Service Letter 347, Revision A, dated December 9, 2019. The service letter specifies procedures for repetitive visual inspections and dye penetrant inspections of the flap torque tube brackets for cracks and instructs operators to replace the torque tube as necessary. 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 ADDRESSES.
Air Tractor SL 347, Rev A specifies performing the dye penetrant inspection within 900 hours TIS, and this AD
requires the initial dye penetrant inspection within 300 hours TIS. Air Tractor SL 347, Rev A specifies replacing a cracked torque tube, while this AD requires replacing a cracked torque tube with a torque tube that has zero hours TIS. Air Tractor SL 347, Rev A specifies reporting any cracked welds identified during the inspections.
Costs of Compliance The FAA estimates that this AD
affects 1,662 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:
ESTIMATED COSTS
Action
Labor cost
Dye penetrant inspection
Visual inspection
4 work-hours $85 per hour Not applicable = $340 per inspection cycle.
.5 work-hour $85 per hour = Not applicable $42.50 per inspection cycle.
The FAA estimates the following costs to do any necessary replacements that will be required based on the
Cost per product
Cost on U.S.
operators
$340 per inspection cycle
$565,080 per inspection cycle
$42.50
$70,635 per inspection cycle
Parts cost
results of the inspection. The FAA has no way of determining the number of
airplanes that might need this replacement.
ON-CONDITION COSTS FOR MODEL AT802 AND AT802A
Potential 485 Airplanes Action
Labor cost
Parts cost
Cost per product
Replacement of torque tube
3 work-hours $85 per hour = $255
$1,292
$1,547
ON-CONDITION COSTS FOR MODEL AT602
Potential 236 Airplanes Action
Labor cost
Parts cost
Cost per product
Replacement of torque tube
3 work-hours $85 per hour = $255
$1,140
$1,395
ON-CONDITION COSTS FOR MODELS AT501, AT502, AT502A, AT502B, AT503, AT503A, AND AT504
Potential 512 Airplanes Action
Labor cost
Parts cost
Cost per product
Replacement of torque tube
3 work-hours $85 per hour = $255
$955
$1,210
ON-CONDITION COSTS FOR MODELS AT250, AT300, AT301, AT302, AT400, AT400A, AT401, AT401A, AT
401B, AT402, AT402A, AND AT402B
Potential 429 Airplanes Action
Labor cost
Parts cost
Cost per product
Replacement of torque tube
3 work-hours $85 per hour = $255
$927
$1,182
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