AD 78-16-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Deutschland Ltd & Co KG | Spey 511-8 | ROLLS-ROYCE, LTD Model 511-8 Engines |
Unsafe Condition
Accumulation of debris in the high pressure fuel shutoff valve's primary inlet strainer, containing hard bronze particles or light silver metallic material, can cause inflight engine flameouts.
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Required Actions
Inspect the primary inlet strainer of the high pressure fuel shutoff valve within 25 hours time in service after the effective date. Depending on debris type, clean or replace the strainer and high pressure fuel pump as specified. Repeat inspections every 50 hours until a modified high pressure fuel pump is installed within 2,000 hours. Install a modified high pressure fuel pump per Lucas SB Sp 73-127/212 within 2,000 hours.
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Compliance Time
Within 25 hours time in service after the effective date of this AD, unless accomplished in the last 50 hours time in service
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Affected Aircraft
Rolls-Royce, Ltd Model 511-8 engines with high pressure fuel pumps having 1500 or more hours time in service, installed on Grumman Gulfstream 1159 airplanes, with high pressure fuel shutoff valves modified per Lucas SB Sp 73-158 but without pumps modified per Lucas SB Sp 73-127/212.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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