AD 2007-10-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Turbomeca Arriel 2B Series Turboshaft Engines |
| engine | Turbomeca | Arriel 2B Series | Airworthiness Directives; Turbomeca Arriel 2B Series Turboshaft Engines |
Unsafe Condition
The deterioration of the splines on the HP/LP pump assembly drive shaft may eventually interrupt fuel supply and cause uncommanded in-flight engine shutdown.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect splines of the coupling shaft assembly and the HP pump drive gear shaft for wear. Inspect HMUs based on their time-since-new or time-since-overhaul, with specific intervals depending on prior inspections and hours accumulated. Perform repetitive inspections every time the HMU is removed or installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 30 hours-in-service from the effective date for engines previously inspected using Update 2 of MSB 292 73 2812; within 50 hours-in-service for HMUs with 450 or more hours TSN/TSO on the effective date; after accumulating 450 hours TSN/TSO but before 500 hours for HMUs with fewer than 450 hours TSN/TSO on the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Turbomeca Arriel 2B Series Turboshaft Engines, specifically those powering single-engine rotorcraft.
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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