AD 2011-21-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Eurocopter | France Model EC 120B | Airworthiness Directives; Eurocopter France Model EC 120B Helicopters |
Unsafe Condition
Jamming of the pilot cyclic control stick due to a single-piece thrust washer, part number C671A1006201, which could lead to loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove the pilot cyclic control stick, replace the thrust washer (P/N C671A1006201) with two thrust washers (P/N C671A1018201 and P/N C671A1019201), reinstall the cyclic control stick, and perform a functional test of the cyclic control system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 30 days after the effective date of the AD (December 20, 2011)
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Eurocopter France Model EC 120B helicopters, serial numbers up to and including 1385, with a thrust washer (P/N C671A1006201) installed on the pilot cyclic control stick friction device, and a pilot cyclic stick (P/N C671A1007101, C671A1007102, or C671A1003102) 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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