AD 2018-12-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Safran | Helicopter | Airworthiness Directives; Safran Helicopter Engines, S.A., Turboshaft Engines |
Unsafe Condition
Uncoupling between the LP fuel pump impeller and the HP fuel pump shaft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the transmissible torque between the LP pump impeller and the HP pump shaft on the HP/LP pump and metering valve assembly, and replace the hydro-mechanical metering unit (HMU) if it does not pass the torque check. Install a Modification TU 178 HMU for any HMU that fails the torque sensor check and as a mandatory terminating action for the inspections required by this AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 2,200 engine flight hours or 72 months after the effective date of this AD, whichever occurs first.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
All Safran Helicopter Engines, S.A., Arriel 2B and 2B1 turboshaft engines.
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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