2024-18586. Airworthiness Directives; Air Tractor, Inc. Airplanes

Estimated Costs

Action	Labor cost	Parts cost	Cost per airplane	Cost on U.S. operators
Inspect horizontal stabilizer spars (without bathtub fittings)	20 work-hours × $85 per hour = $1,700	$0	$1,700 per inspection cycle	$51,000 per inspection cycle.
Install bathtub fittings	40 work-hours × $85 per hour = $3,400	3,100	$6,500	$195,000.
( print page 67269)
Inspect horizontal stabilizer spars (with bathtub fittings)	3 work-hours × $85 per hour = $255	0	$255 per inspection cycle	$7,650 per inspection cycle.
Report inspection results	1 work-hour × $85 per hour = $85	0	$85 per inspection cycle	$2,550 per inspection cycle.

The FAA estimates the following costs to do any necessary replacements that would be required based on the results of the inspection. The agency has no way of determining the number of airplanes that might need this replacement:

On-Condition Costs

Action	Labor cost	Parts cost	Cost per airplane
Replace horizontal stabilizer spar	40 work-hours × $85 per hour = $3,400	$2,800	$6,200