AD 2012-09-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Eurocopter | Deutschland GMBH | Airworthiness Directives; Eurocopter Deutschland GMBH Helicopters |
Unsafe Condition
Failure of a few engines to reach the specified one-engine-inoperative (OEI) rating at altitudes above 10,000 feet due to engine acceleration limitation caused by lower delivered fuel flow than required for OEI rating at high altitude.
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Required Actions
Install a placard corresponding to the maximum permissible flight altitude, amend the Rotorcraft Flight Manual (RFM) to revise the maximum permissible operating altitude, insert revised performance charts into the RFM, perform a repetitive maintenance 'MAX N1 CHECK' to determine appropriate maximum altitudes, and repeat the 'MAX N1 CHECK' if the engine, Fuel Control Unit (FCU), or module 2 or 3 is replaced. Modifying both engines with Turbomeca Modification TU 358 provides terminating action for the AD requirements.
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Compliance Time
Before further flight
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Affected Aircraft
Eurocopter Deutschland GMBH Model MBB-BK 117 C-1 and C-2 helicopters with a Turbomeca Arriel 1E2 engine installed, which has an FCU that has not been modified with Turbomeca Modification TU 358.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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