AD 91-03-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BAE Systems (Operations) Limited | ATP | Airworthiness Directives; British Aerospace Model ATP Series Airplanes |
Unsafe Condition
Rupture in the AC generators' oil system and subsequent loss of electrical power.
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Required Actions
Within 125 hours time-in-service after the effective date, and thereafter every 500 hours time-in-service, inspect inlet oil strainer and outlet/vent filters per Lucas Aerospace SB BA03301-24-1. Replace generator if debris found. Install new outlet/vent filters on generators with part numbers BA3301-01/02 within 1,250 hours time-in-service per SB BA03301-24-2. Install new end plate, mainframe, and revised sealing features within 18 months per SB BA03301-24-3 to terminate repetitive inspections. Alternate compliance allowed with FAA approval.
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Compliance Time
Within specified timeframes: 125 hours time-in-service (initial inspection), 1,250 hours time-in-service (filters installation), 18 months (end plate/mainframe installation).
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Affected Aircraft
British Aerospace Model ATP series airplanes with AC generators part numbers BA03301, BA03301-01, BA03301-02, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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