AD Amdt-39-10947
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce | Limited | Airworthiness Directives; Rolls-Royce Limited, Bristol Engines Division, Viper Models Mk.521 and Mk.522 Turbojet Engines |
Unsafe Condition
Reports of high pressure (HP) fuel pump drive shaft failures resulting in in-flight engine shutdowns, attributed to reduced lubricity properties of fuel caused by water contamination.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service affected HP fuel pumps and replace with serviceable HP fuel pumps, as specified in Rolls-Royce Service Bulletins 73-A115 and 73-A118, depending on engine model and part number.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 18 months after the effective date of the AD, or earlier as specified.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Rolls-Royce Limited, Bristol Engines Division, Viper Models Mk.521 and Mk.522 turbojet engines with specific HP fuel pump part numbers (MGBB.167, MGBB.134, MGBB.137, MGBB.145, MGBB.168, MGBB.169).
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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