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AD: MD Helicopters

AD NUMBER: 2019-05-04

PRODUCT: MDHI Model 369A, 369D, 369E, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N helicopters.

ACTION: Final Rule.

SUMMARY:   This AD requires inspecting each main rotor blade (MRB) for a crack.

This AD was prompted by reports of cracked MRBs.

DATES: This AD is effective April 17, 2019.

COST: The FAA estimates that this AD affects 730 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.

Inspecting one MRB requires about 0.1 work-hour, for an estimated cost per helicopter of $43 for the 705 MDHI Model 369-series and 500N helicopters (5 MRBs), $51 for the 25 MDHI Model 600N helicopters (6 MRBs), and a total estimated cost of $31,590 for the U.S. fleet per inspection cycle.

If required, replacing one MRB requires about 3 work-hours and parts cost about $13,000 for a total estimated cost of $13,255 per MRB.

FMI: AD

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