AD 81-24-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | GTSIO-520-C | TELEDYNE CONTINENTAL MOTORS Models IO-520, TSIO-520 and GTSIO-520 (except GTSIO-520-F and K) Engines |
| engine | Continental Motors | GTSIO-520-D | TELEDYNE CONTINENTAL MOTORS Models IO-520, TSIO-520 and GTSIO-520 (except GTSIO-520-F and K) Engines |
| engine | Continental Motors | GTSIO-520-E | TELEDYNE CONTINENTAL MOTORS Models IO-520, TSIO-520 and GTSIO-520 (except GTSIO-520-F and K) Engines |
| engine | Continental Motors | GTSIO-520-H | TELEDYNE CONTINENTAL MOTORS Models IO-520, TSIO-520 and GTSIO-520 (except GTSIO-520-F and K) Engines |
| engine | Continental Motors | GTSIO-520-L | TELEDYNE CONTINENTAL MOTORS Models IO-520, TSIO-520 and GTSIO-520 (except GTSIO-520-F and K) Engines |
| engine | Continental Motors | GTSIO-520-M | TELEDYNE CONTINENTAL MOTORS Models IO-520, TSIO-520 and GTSIO-520 (except GTSIO-520-F and K) Engines |
| engine | Continental Motors | GTSIO-520-N | TELEDYNE CONTINENTAL MOTORS Models IO-520, TSIO-520 and GTSIO-520 (except GTSIO-520-F and K) Engines |
| engine | Continental Motors | IO-520-A | TELEDYNE CONTINENTAL MOTORS Models IO-520, TSIO-520 and GTSIO-520 (except GTSIO-520-F and K) Engines |
| engine | Continental Motors | IO-520-B | TELEDYNE CONTINENTAL MOTORS Models IO-520, TSIO-520 and GTSIO-520 (except GTSIO-520-F and K) Engines |
| engine | Continental Motors | IO-520-BA | TELEDYNE CONTINENTAL MOTORS Models IO-520, TSIO-520 and GTSIO-520 (except GTSIO-520-F and K) Engines |
Unsafe Condition
Fuel leakage and potential fire hazard due to improperly torqued fuel pump through bolts in engine driven fuel pumps with serial numbers I0178XX through A0280XX.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 10 hours time in service after the effective date, visually check the fuel pump for fuel leaks or stains every 10 hours until (b) is done. Remove safety wire from four through bolts, torque them to 30 in-lbs (±1 in-lb) in diagonally opposite pairs, resafety wire bolts, and inspect for leaks after pressurizing the fuel system. If leaks persist, overhaul or replace the pump. For pumps with prior leaks, check during next five preflights as described.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours time in service after the effective date of this AD
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Affected Aircraft
TELEDYNE CONTINENTAL MOTORS Models IO-520, TSIO-520 and GTSIO-520 (except GTSIO-520-F and K) engines with fuel pumps serial numbers I0178XX through A0280XX, assembled between September 1, 1978, and July 31, 1980, or fuel pumps replaced during that period.
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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