AD 75-04-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT3D-3 | PRATT & WHITNEY AIRCRAFT Models JT3D-3, JT3D-3B, and JT3D-7 Engines |
| engine | Pratt & Whitney Division | JT3D-3B | PRATT & WHITNEY AIRCRAFT Models JT3D-3, JT3D-3B, and JT3D-7 Engines |
| engine | Pratt & Whitney Division | JT3D-7 | PRATT & WHITNEY AIRCRAFT Models JT3D-3, JT3D-3B, and JT3D-7 Engines |
Unsafe Condition
The tenth stage compressor disk, P/N 701810, may exceed its cyclic life limit, leading to potential failure of the disk.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service the tenth stage compressor disk prior to exceeding the revised life limits (25,000 cycles for JT3D-3 and -3B, 23,000 cycles for JT3D-7) or within the next 25 cycles after the AD's effective date, whichever comes later. If a disk was used in multiple engine models, it must be limited to the lowest cyclic life limit among those models.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to exceeding the revised life limit listed below or within the next 25 cycles in service after the effective date of this AD, whichever comes later
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Aircraft JT3D-3, JT3D-3B, and JT3D-7 turbofan engines containing tenth stage compressor disk, P/N 701810
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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