AD 2016-01-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD | Various | Airworthiness Directives; MD Helicopters Inc. |
Unsafe Condition
Rotating cone assembly remaining in service beyond its fatigue life, which could result in failure of the rotating cone assembly and loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 1 year or at the next annual inspection, whichever comes later: (1) Create a component history card or equivalent record for each rotating cone assembly, P/N 500N3740-81 and P/N 500N3740-71, and record a life limit of 10,000 hours time-in-service (TIS). (2) Revise the Airworthiness Limitations Section of the applicable maintenance manual or Instructions for Continued Airworthiness by establishing a new retirement life of 10,000 hours TIS for each rotating cone assembly. (3) Remove from service any rotating cone assembly, P/N 500N3740-81 and P/N 500N3740-71, that has 10,000 or more hours TIS. (4) Do not install a rotating cone assembly, P/N 500N3740-81 or P/N 500N3740-71, on any helicopter unless you have complied with the requirements of this AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 1 year or at the next annual inspection, whichever comes later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
MD Helicopters Inc. Model 500N with a rotating cone assembly part number (P/N) 500N3740-81 installed, and Model 600N helicopters with a rotating cone assembly P/N 500N3740-71 installed, certificated in any category.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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