AD 72-25-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | RR C90-12F | ROLLS ROYCE (1971) LIMITED Models RR C90, RR O-200, and RR O-300 Engines |
| engine | Continental Motors | RR C90-12FH | ROLLS ROYCE (1971) LIMITED Models RR C90, RR O-200, and RR O-300 Engines |
| engine | Continental Motors | RR C90-12FJ | ROLLS ROYCE (1971) LIMITED Models RR C90, RR O-200, and RR O-300 Engines |
| engine | Continental Motors | RR C90-12FP | ROLLS ROYCE (1971) LIMITED Models RR C90, RR O-200, and RR O-300 Engines |
| engine | Continental Motors | RR C90-14F | ROLLS ROYCE (1971) LIMITED Models RR C90, RR O-200, and RR O-300 Engines |
| engine | Continental Motors | RR C90-14FH | ROLLS ROYCE (1971) LIMITED Models RR C90, RR O-200, and RR O-300 Engines |
| engine | Continental Motors | RR C90-14FJ | ROLLS ROYCE (1971) LIMITED Models RR C90, RR O-200, and RR O-300 Engines |
| engine | Continental Motors | RR C90-16F | ROLLS ROYCE (1971) LIMITED Models RR C90, RR O-200, and RR O-300 Engines |
| engine | Continental Motors | RR C90-8F | ROLLS ROYCE (1971) LIMITED Models RR C90, RR O-200, and RR O-300 Engines |
| engine | Continental Motors | RR C90-8FJ | ROLLS ROYCE (1971) LIMITED Models RR C90, RR O-200, and RR O-300 Engines |
Unsafe Condition
Loss of oil pressure due to excessive wear of oil pump drive gear P/N's 22354/RR or 23403/RR.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 25 hours' time in service after the effective date, inspect the oil pump drive gear's back lash (angular movement) per Service Bulletin T-200. Depending on the back lash measurement, adjust inspection intervals: ≤6 degrees every 300 hours, >6 to ≤10 degrees every 100 hours, >10 to ≤14 degrees every 25 hours, or replace gear if >14 degrees before further flight. Replace with improved gear or equivalent if necessary.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 25 hours' time in service after the effective date of this AD, unless already accomplished within the last 25 hours' time in service before the effective date, and thereafter at the intervals specified.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Rolls Royce (1971) Limited Models RR C90 (except S/N 11R021 and subsequent), RR O-200 (except S/N 23R590-23R600 and 23R638 and subsequent), and RR O-300 (except S/N 31R162 and subsequent) engines with oil pump drive gear P/N 22354/RR or 23403/RR installed.
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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