AD 2009-01-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turbomeca Arriel 2B and 2B1 Turboshaft Engines |
| engine | Turbomeca | Arriel 2B and 2B1 | Airworthiness Directives; Turbomeca Arriel 2B and 2B1 Turboshaft Engines |
Unsafe Condition
Loss of internal components from the Hydro Mechanical Unit (HMU) low fuel pressure switch Hydra-Electric part number (P/N) 9 550 17 956 0 into the fuel system may lead to a rupture of the HP-LP pumps drive shaft shear pin, and thus to a possible uncommanded in-flight shutdown (IFSD).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the HMU to identify the low fuel pressure switch. If a Hydra-Electric low fuel pressure switch P/N 9 550 17 956 0 is installed, inspect the switch and HMU chamber. Replace the HMU or low fuel pressure switch as necessary. If a different switch is installed and has been the only type since new, no further action is required. If a Hydra-Electric switch P/N 9 550 17 956 0 was previously installed, inspect the HMU chamber and replace the HMU if parts are found.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
No later than September 30, 2009
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Turbomeca Arriel 2B and 2B1 turboshaft engines installed on, but not limited to, Eurocopter France AS350B3 and EC130 B4 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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.