AD 2007-11-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turbomeca Arrius 2F Turboshaft Engines |
| engine | Turbomeca | Arrius 2F | Airworthiness Directives; Turbomeca Arrius 2F Turboshaft Engines |
Unsafe Condition
FCUs not incorporating modification Tf 55 are susceptible to having an improperly assembled constant delta pressure (delta P) diaphragm, which could lead to an uncommanded engine in-flight shutdown on a single-engine helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace all FCUs not incorporating modification Tf 55 with FCUs that incorporate modification Tf 55.
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Compliance Time
No later than July 31, 2007, unless the actions have already been done.
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Affected Aircraft
Turbomeca Arrius 2F turboshaft engines with fuel control units (FCUs) not incorporating modification Tf 55, installed on, but not limited to, Eurocopter EC120B helicopters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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