AD 65-09-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Gulfstream Aerospace Corporation | G-159 | Airworthiness Directives; GRUMMAN Model G-159 Aircraft |
Unsafe Condition
Cracks in the APU turbine wheel and exducer, rubbing on the shroud plate, erosion and overheating of blade tips, improper starter clutch torque, and incorrect APU fuel pump acceleration limiter settings could lead to APU failure or unsafe operation.
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Required Actions
Visually inspect the APU turbine wheel and exducer for surface cracks, shroud plate for rubbing, blade tips for erosion and overheating; remove cracked or damaged components. Check and adjust starter clutch torque and APU fuel pump acceleration limiter settings as per specified service bulletins.
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Compliance Time
Within the next 15 hours of APU operation or 30 starts of the APU, whichever occurs first, and at intervals not exceeding 250 hours of APU operation or 500 starts of the APU since the last inspection.
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Affected Aircraft
GRUMMAN Model G-159 Aircraft equipped with AiResearch Gas Turbine Compressor Units Model GTC 85-37, Series 1 through 18.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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