AD 2007-24-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turbomeca Arriel 2S1 and 2S2 Turboshaft Engines |
| engine | Turbomeca | Arriel 2S1 and 2S2 | Airworthiness Directives; Turbomeca Arriel 2S1 and 2S2 Turboshaft Engines |
Unsafe Condition
During assembly of a new HP/LP fuel pump, the drain screw on the fuel filter unit failed when tightened to the torque value specified in the assembly schedule (12 Nm). Mechanical calculations show that a torque value of 12 Nm exceeds the elastic limit of the material, potentially causing the screw to fail and result in a fuel leak, leading to engine flame-out or engine fire.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the fuel filter drain screw with a new one and tighten it to an effective torque of 6.5 Nm, using Turbomeca Mandatory Service Bulletin No. 292 73 2824.
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Compliance Time
Within 30 HMU operating hours or 45 days after the effective date of this AD, whichever occurs first.
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Affected Aircraft
Turbomeca Arriel 2S1 and 2S2 turboshaft engines, all serial numbers with a hydro mechanical unit (HMU) installed or repaired/overhauled before December 8, 2006. These engines are installed on, but not limited to, Sikorsky S-76C helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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