Airworthiness Directive · Amendment 39-21132 · MD Helicopter Inc., Helicopters
MD Helicopter Inc., Helicopters
This AD applies to MDHI Model 369D, 369E, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N helicopters, certificated in any category, with a main rotor (M/R) hub lead-lag bolt (bolt) part number (P/N) 369D21220 with a serial number (S/N) listed in paragraph 1.B. of MD Helicopters Service Bulletin No. SB369D-223, SB369E-122, SB369F-110, SB369H-259, SB500N-060, or SB600N-073, each dated April 19, 2019, installed.
The FAA is adopting a new airworthiness directive (AD) for MD Helicopters Inc., (MDHI) Model 369D, 369E, 369FF, 369H, 369HE, 369HM, 369HS, 500N, and 600N helicopters. This AD was prompted by a report of non-conforming main rotor (M/R) hub lead-lag bolts (bolts). This AD requires removing certain bolts from service. The FAA is issuing this AD to address the unsafe condition on these products.
(1) At the next overhaul of the M/R assembly or within 3 months, whichever occurs first, remove from service each bolt with a P/N and S/N listed in paragraph (c) of this AD.
(2) After the effective date of this AD, do not install on any helicopter a bolt with a P/N and S/N listed in paragraph (c) of this AD.
