AD 68-02-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Limited | Gipsy Queen 70-4 | BRISTOL SIDDELEY Model Gipsy Queen Series 70 Engines |
| engine | Rolls-Royce Limited | Gipsy Queen 70 MK2 | BRISTOL SIDDELEY Model Gipsy Queen Series 70 Engines |
| engine | Rolls-Royce Limited | Gipsy Queen 70 MK3 | BRISTOL SIDDELEY Model Gipsy Queen Series 70 Engines |
Unsafe Condition
Failure of the crankshaft front end that could result in loss of the propeller.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 400 hours' time in service after the effective date, and thereafter every 400 hours' time in service, visually inspect the crankshaft for cracks per Bristol Siddeley TNS G.Q. 70 No. 105 or FAA-approved equivalent. Replace cracked crankshafts before further flight with uncracked ones or incorporate Modification 2925 (R.550). If no cracks are found, incorporate Modification 2925 at next overhaul. Discontinue inspections after Modification 2925 is incorporated.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 400 hours' time in service after the effective date of this AD and thereafter at intervals not to exceed 400 hours' time in service from the last inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bristol Siddeley Model Gipsy Queen Series 70 Engines with Crankshafts incorporating Modifications 1399 (R.155), 1609 (R.259), 2289 (R.155 and R.259), 2931 (R.563 and R.564), or Repair Schemes R.155 and R.259.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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