Airworthiness directives › 2020-11-07
AD 2020-11-07 Airworthiness Directives; MD Helicopter Inc., Helicopters
Models named: 369D, 369E, 369FF, 369H, 369HE, 369HM, 369HS, 500N, 600N. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(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.
Unsafe condition
This AD was prompted by a report of non-conforming bolts. The FAA is issuing this AD to prevent failure of a bolt. The unsafe condition, if not addressed, could result in loss of an M/R blade and subsequent loss of control of the helicopter.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1