AD 75-01-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-1 | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -7, and -7A Engines |
| engine | Pratt & Whitney Division | JT8D-1A | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -7, and -7A Engines |
| engine | Pratt & Whitney Division | JT8D-7 | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -7, and -7A Engines |
| engine | Pratt & Whitney Division | JT8D-7A | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -7, and -7A Engines |
Unsafe Condition
Failure of the low turbine shaft spline due to cracks or wear.
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Required Actions
Remove thin wall low turbine shafts not incorporating Service Bulletin 2452 before 6700 cycles since new or within 2000 cycles after January 8, 1975. Inspect shafts with SB2452 for cracked splines before 6700 cycles since last inspection or 2000 cycles after January 8, 1975, then every 6700 cycles. Inspect No. 2 compressor hub splines for peeling or taper wear exceeding 0.010 inch when shafts are removed or inspected. Remove cracked, peeling, or worn components before further flight.
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Compliance Time
Before the accumulation of 6700 cycles in service since new, or within the next 2000 cycles in service after January 8, 1975, whichever is later. Subsequent inspections must be done within intervals not exceeding 6700 cycles in service since last inspection.
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Affected Aircraft
Pratt & Whitney JT8D-1, -1A, -7, and -7A engines.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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