AD 61-05-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Thompson Aircraft Sales | T-28A | Airworthiness Directives; North American Model T-28A Aircraft |
Unsafe Condition
The R-1300-1A engines may experience failure modes requiring incorporation of Change 53 of T.O. 2R-R1300-5, fuel pump overhauls, hydraulic pump overhauls, propeller inspections and removal, and cylinder inspections to prevent potential engine failure, oil leaks, or propeller malfunctions.
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Required Actions
Incorporate Change 53 of T.O. 2R-R1300-5 upon reaching 860 hours since last overhaul or 860 hours total time since new; overhaul engine-driven fuel pump AN-4100 and fuel booster pump every 1,200 hours' time in service; overhaul engine-driven hydraulic pump AS-6201-1 every 860 hours' time in service; disassemble, inspect, and rework A-422-E1/-E2 propellers at 300 hours' time in service and remove after 2,100 hours; conduct cylinder inspections per T.O. 1T-28A-531 every 30 hours or when leaks/smudges are detected.
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Compliance Time
Compliance required as indicated.
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Affected Aircraft
North American Model T-28A Aircraft certified in the Restricted Category with R-1300-1A engines, A-422-E1/-E2 propellers, and engine-driven fuel pump AN-4100, fuel booster pump, hydraulic pump AS-6201-1, and cylinders requiring inspection.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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