2024-27709. Airworthiness Directives; Embraer S.A. Airplanes

Estimated Costs

Action	Labor cost	Parts cost	Cost per product	Cost on U.S. operators
Airplane groups 1 and 2—install structural reinforcements	22 work-hours × $85 per hour = $1,870	$1,600	$3,470	$242,900 (70 airplanes).
Airplane groups 3, 4, and 5—install structural reinforcements and replace floor fasteners	14 work-hours × $85 per hour = $1,190	600	1,790	$200,480 (112 airplanes).
Airplane groups 6 and 8—install structural reinforcements and replace floor fasteners	26 work-hours × $85 per hour = $2,210	2,000	4,210	$84,200 (20 airplanes).
Airplane group 7—install structural reinforcements	20 work-hours × $85 per hour = $1,700	1,600	3,300	$16,500 (5 airplanes).
Airplane group 9—install structural reinforcements	14 work-hours × $85 per hour = $1,190	1,600	2,790	$2,790 (1 airplane).

The FAA estimates the following costs for the additional work that operators would be required to do for compliance with this AD if they completed the actions in the original version of Embraer Service Bulletin SB505-25-0046, dated March 31, 2021; Service Bulletin SB505-25-0046, Revision 01, dated May 8, 2023; or Service Bulletin SB505-25-0046, Revision 02, dated February 19, 2024. 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
Inspect floor fasteners	9 work-hours × $85 per hour = $765	$50	$815
Replace floor fasteners	1 work-hour × $85 per hour = $85	50	135
Airplane groups 1 and 2 install reinforcement support on left-hand forward cabinet	2 work-hours × $85 per hour = $170	200	370