AD NUMBER: 2018-20-09

PRODUCT: Airbus Helicopters Deutschland GmbH (Airbus Helicopters) Model MBB-BK 117 C-2 and MBB-BK 117 D-2 helicopters.

ACTION: Final Rule.

SUMMARY:  This AD requires altering and re-identifying the overhead panel shock mount assembly (shock mount).

This AD was prompted by the manufacturer's stress recalculations.

DATES: This AD is effective November 7, 2018.

COST: The FAA estimates that this AD affects 144 helicopters of U.S. Registry. The FAA estimates that operators may incur the following costs in order to comply with this AD:

• Labor costs are estimated at $85 per work-hour.
• Installing retaining plates and re-identifying the four shock mounts takes about 3 work-hours and parts cost about $184 for a total estimated cost of $439 per helicopter and $63,216 for the U.S. fleet.
• According to Airbus 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 Airbus Helicopters. Accordingly, all costs have been included in the cost estimate.

FMI: AD