AD NUMBER: 2018-03-03 R1

PRODUCT: Certain Textron Aviation Inc. Models 401, 401A, 401B, 402, 402A, 402B, 402C, 411, 411A, 414, 414A, 421, 421A, 421B, 421C, and 425 airplanes.

ACTION: Final rule; request for comments.

SUMMARY: The FAA is revising Airworthiness Directive (AD) 2018-03-03 for the aircraft listed above.

AD 2018-03-03 required repetitively inspecting the left and the right forward lower carry through spar cap for cracks and replacing the carry through spar cap if cracks were found.

This AD addresses the same unsafe condition and requires the same actions as AD 2018- 03-03, but clarifies the compliance times for the initial inspection of the carry through spar cap.

This AD was prompted by several reports of confusion in interpreting the compliance times for the initial inspection of the carry through spar cap. The FAA is issuing this AD to eliminate confusion in interpreting the compliance times for this inspection.

DATES: This AD is effective May 23, 2018. Comments must be received by June 22, 2018.

COST: The FAA estimates that this AD affects 2,147 airplanes of U.S. registry. The cost of compliance is estimated as follows:

• Inspect the left and the right forward lower carry through spar cap for cracks (without inspection access panels): $1,020 per aircraft per inspection cycle.
• Replace carry through spar cap: $73,000 per aircraft for parts and labor.

FMI: AD