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AD: MD Helicopters Inc. Helicopters

AD NUMBER: 2020-06-11

PRODUCT: MD Helicopters Inc. (MDHI) Model 600N helicopters.

ACTION: Final rule

SUMMARY: This AD requires establishing a life limit for the main rotor (M/R) blade upper control collective/longitudinal link assembly (link assembly).

This AD was prompted by the discovery that the life limit was omitted from the maintenance manual.

DATES: This AD is effective April 28, 2020.

COST: The FAA estimates that this AD affects 26 helicopters of U.S. registry. Operators may incur the following costs in order to comply with this AD:

Labor costs are estimated at $85 per work-hour.

Determining the hours TIS of each link assembly and updating the aircraft records takes about 30 minutes, for a cost of $43 per helicopter.
Replacing a link assembly, if needed, takes about 2 work-hours, and parts cost about $984 for an estimated replacement cost of $1,154 per link per helicopter.

FMI: AD

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