AD 82-03-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 250-C28B | DETROIT DIESEL ALLISON Model 250-C28B Engines |
Unsafe Condition
Possible engine power loss resulting from intermittent or spurious activation of the N2 (Electronic) Overspeed Control System.
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Required Actions
Disarm the N2 Overspeed Circuit Breaker by pulling it and securing with tape or a Ty-wrap. Install a placard stating 'ENG OVSP CIRCUIT DEACTIVATED' near the breaker. Install P/N AN814-4DL or Alternate Plug with P/N AS3084-04 Packing in the N2 Overspeed Solenoid Valve outlet port, tightened and safety-wired.
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Compliance Time
before further flight
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Affected Aircraft
All Model 250-C28B engines installed in, but not limited to, Bell Model 206L-1 rotorcraft certificated in all categories.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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