AD 2005-21-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | MD | Various | Airworthiness Directives; MD Helicopters, Inc. Model 369D, 369E, 369F, 369FF, 500N, and 600N Helicopters |
Unsafe Condition
Fatigue cracking of the main rotor blade due to a higher number of torque events (TEs) than originally calculated, which could lead to blade failure and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect both surfaces of each main rotor blade using a 10X or higher magnifying glass to detect chord-wise cracks protruding from under the root fitting and doubler on the bottom-side of the blade. Replace any cracked blade with an airworthy blade. Determine and record the number of torque events (TEs) accumulated on each blade.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
MD Helicopters, Inc. Model 369D, 369E, 369F, 369FF, 500N, and 600N helicopters with certain part-numbered main rotor blades and modified with Supplemental Type Certificate (STC) No. SR09172RC, SR09074RC, or SR09184RC.
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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