AD NUMBER: 2017-26-09

PRODUCT: Certain ATR–GIE Avions de Transport Régional Model ATR 42-500 airplanes and Model ATR 72-212A airplanes.

ACTION: Final rule; request for comments.

SUMMARY: This AD requires a one-time inspection for damage of the engine fire extinguishing pipes and incorrect pipe installation, and corrective actions if necessary.

This AD was prompted by a report of damage to an engine fire extinguishing pipe due to chafing between the pipe and a fastener assembly; the chafing occurred as a result of incorrect installation of the pipe.

COST: Currently, there are no affected U.S.-registered airplanes. If an affected airplane is imported and placed on the U.S. Register in the future, the following cost estimates are expected to comply with this AD: Aout 2 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 $0 per product. Based on these figures, the cost of this AD will be approximately $170 per product.

Any necessary follow-on actions will take about 16 work-hours and require parts costing $1,360, for a cost of $2,720 per product. There is no way of determining the number of aircraft that might need these actions.

DATES: This AD becomes effective January 18, 2018. Comments must be received by February 20, 2018.

FMI: AD