2024-21652. Airworthiness Directives; Piper Aircraft, Inc. Airplanes

Estimated Costs

Action	Labor cost	Parts cost	Cost per product	Cost on U.S. operators
Review airplane maintenance records and determine CSH for each main wing spar	3 work-hours × $85 per hour = $255, per records review	$0	$255, per records review	$2,719,575, per records review.

The FAA estimates the following costs to do any necessary actions that would be required based on the results of the proposed airplane maintenance records review and CSH calculation. The agency has no way of determining the number of airplanes that might need these actions:

On-Condition Costs

Action	Labor cost	Parts cost	Cost per product
Eddy current inspections of the left-hand (LH) and right-hand (RH) inspection areas LH and RH lower main wing spar (including access and restoring the airplane)	1 work-hour contracted service × $600 per hour = $600 for the eddy current inspection 4 work-hours × $85 per hour for access and restoring = $340	$20	$960 per inspection.
Report inspection results to the FAA and Piper Aircraft, Inc	1 work-hour × $85 per hour = $85 per report	0	85 per report.
Repair holes with non-crack damage	2 work-hours × $85 per hour = $170	20	190.
Replace main wing spar	40 work-hours × $85 per hour = $3,400 per main wing spar	10,983	14,383 per main wing spar.
Install modification (reinforcement) kit	190 work-hours × $85 per hour = $16,150 per main wing spar	4,000	20,150 per wing spar.