AD NUMBER: 2017-25-15

PRODUCT: Certain ATR-GIE Avions de Transport Régional Model ATR42-300 and -500 airplanes and Model ATR72-202 and -212A airplanes.

ACTION: Final Rule; request for comments

SUMMARY:  This AD requires identifying the serial number of the dual distributor valve (DDV), and replacement of affected DDVs.

This AD was prompted by an investigation performed on a failed DDV that revealed a nonconformity of crimping on an internal valve.

COST: Currently, there are no affected airplanes on the U.S. Register. If an affected airplane is imported and placed on the U.S. Register in the future, the FAA has provided the following cost estimates to comply with this AD. The FAA estimates that it will take about 84 work-hours per product to comply with the basic requirements of this AD. The average labor rate is $85 per work-hour. Required parts will cost about $12,000 per product. Based on these figures, the estimated cost of this AD is $19,140 per aircraft.

DATES: This AD becomes effective January 2, 2018. Comments must be received by February 1, 2018.

FMI: AD