AD NUMBER: 2017-14-05

PRODUCT: Airbus Helicopters Model SA330J helicopters.

ACTION: Final Rule; request for comments

SUMMARY: This AD requires replacing certain hydraulic pumps and is prompted by reports of broken screws that attach the cover of the hydraulic pump.

EASA has issued EASA Emergency AD No. 2016-264-E, dated December 22, 2016, to correct an unsafe condition for Airbus Helicopters Model SA330J helicopters. EASA advises of reports of broken screws that attach the cover of the hydraulic pump.

A subsequent investigation identified a batch of screws delivered between July 1, 2015, and November 1, 2016, that have intrinsic embrittlement and reduced mechanical properties. Hydrogen was introduced into this batch of screws during production, causing the screws to become brittle and lack sufficient strength. These screws were installed in a batch of hydraulic pumps, part number (P/N) FR65WEO2005-175A, identified by certain serial numbers, EASA advises.

This condition, if not detected and corrected, could lead to the failure of a cover bolt and loss of fluid from the hydraulic pump, resulting in loss of the hydraulic system and subsequent loss of helicopter control. As a result, EASA AD No. 2016-264-E requires replacing the hydraulic pumps.

The FAA estimates that this AD affects 24 helicopters and that labor costs average $85 per work-hour. Based on these estimates, it is expected that replacing a hydraulic pump requires 2 work-hours and parts cost $2,500 for a total cost of $2,670 per helicopter and $64,080 for the U.S. fleet.

DATES: This AD becomes effective July 26, 2017. Comments must be received by September 11, 2017.

FMI: AD