AD Amdt-39-10940
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce | Limited | Airworthiness Directives; Rolls-Royce Limited, Bristol Engines Division and Rolls-Royce (1971) Limited, Bristol Engines Division Viper Series Turbojet Engines |
Unsafe Condition
High pressure fuel leak at the BFCU augmentor and bypass valve assembly joint washer interface, which could result in an engine nacelle fire and damage to the aircraft.
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Required Actions
Perform a one-time visual inspection of the barometric flow control unit (BFCU) augmentor and bypass valve joint washer for joint washer integrity. Replace with serviceable parts if necessary, following specific Rolls-Royce Alert Service Bulletins (ASBs) for each engine series.
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Compliance Time
Within 2 months or 100 hours time in service (TIS) after the effective date, or at the next engine removal, depending on TIS since new, overhaul, or repair of the BFCU.
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Affected Aircraft
Rolls-Royce plc Viper Mk. 521, 522, 526, and 601 series turbojet engines installed on but not limited to Raytheon (formerly British Aerospace, Hawker Siddeley) Models BH.125 and DH.125 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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