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AD: Various Model 234 And Model CH-47D Helicopters

AD NUMBER: 2018-16-11

PRODUCT: Various Model 234 and Model CH-47D helicopters.

ACTION: Final Rule.

SUMMARY: This AD requires inspections of the pitch housing and revising the pitch housing retirement life.

This AD was prompted by reports of cracking in the pitch housing lugs.

The actions of this AD are intended to detect and prevent an unsafe condition on these products.

DATES: This AD is effective September 17, 2018.

COST: The FAA estimates  that this AD affects 15 helicopters of U.S. Registry and that labor costs average $85
per work-hour. The cost of compliance is estimated as follows:

An eddy current inspection requires 4 work-hours for a total cost of $340 per helicopter and $5,100 for the U.S. fleet, per inspection cycle.
An ultrasonic inspection requires 4 work-hours for a total cost of $340 per helicopter and $5,100 for the U.S. fleet, per inspection cycle.
Replacing a pitch housing requires 8 work-hours and parts cost $13,000, for a total cost of $13,680 per helicopter.

FMI: AD

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