AD 67-22-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Deutschland Ltd & Co KG | Spey 506-14 | ROLLS-ROYCE Model 506-14 Engines |
Unsafe Condition
Failure of the C.A.S.C. 105 and 125 Lucas fuel flow controls due to wear of the splines on the input drive assembly.
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Required Actions
Inspect the input drive assembly per Rolls-Royce Service Bulletin SP 73-A109 or FAA-approved equivalent. If wear is found, incorporate Modification 3258 or FAA-approved equivalent before further flight. Repeat inspections at intervals not exceeding 800 hours' time in service from the last inspection, with initial compliance deadlines based on existing time in service.
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Compliance Time
Within the next 100 hours' time in service after the effective date (August 25, 1967) for controls with 700+ hours, or before accumulating 800 hours' time in service for those with less than 700 hours. Overhauled units follow similar timelines based on post-overhaul time.
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Affected Aircraft
Rolls-Royce Spey Model 506-14 engines with C.A.S.C. 105 and 125 Lucas fuel flow controls, including those overhauled as specified.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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