AD NUMBER: 2018-07-08

PRODUCT: Agusta S.p.A. (Agusta) Model A109E, A109K2, A109S, AW109SP, A119, and AW119 MKII helicopters.

ACTION: Final rule; request for comments

SUMMARY: This AD reduces the life limit of and requires inspecting a tail rotor blade retention bolt (bolt). This AD is prompted by the discovery of a cracked bolt.

DATES: This AD becomes effective April 26, 2018. Comments must be received by June 11, 2018.

COST: The FAA estimates that this AD affects 234 helicopters of U.S. Registry. Operators may incur the following costs in order to comply with this AD. Labor costs are estimated at $85 per work-hour.

Removing a bolt that has reached its new life limit will take about 2 work-hours for a cost of $170 per bolt. Inspecting the bolts will take about 4 work-hours for an estimated cost of $340 per helicopter and $79,560 for the U.S. fleet. Replacing a bolt will take negligible additional labor time and parts will cost about $500.

According to Leonardo Helicopter's service information, some of the costs of this AD may be covered under warranty, thereby reducing the cost impact on affected individuals. The FAA does not control warranty coverage by Leonardo Helicopter. Accordingly, all costs have been included in the cost estimate.

FMI: AD