AD 70-26-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-1 | PRATT & WHITNEY AIRCRAFT Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-11 | PRATT & WHITNEY AIRCRAFT Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-15 | PRATT & WHITNEY AIRCRAFT Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-15A | PRATT & WHITNEY AIRCRAFT Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-17 | PRATT & WHITNEY AIRCRAFT Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-17A | PRATT & WHITNEY AIRCRAFT Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-17AR | PRATT & WHITNEY AIRCRAFT Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-17R | PRATT & WHITNEY AIRCRAFT Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-1A | PRATT & WHITNEY AIRCRAFT Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-1B | PRATT & WHITNEY AIRCRAFT Model JT8D Series Engines |
Unsafe Condition
Failure of the first stage compressor rotor blades due to improperly machined blade roots with tool marks within the radius of the Z plane platform on both sides of the blade root area.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect all P/N 487801, 511901 change letter L or earlier, 594601 and 616601 change letter B or earlier first stage compressor rotor blades for tool marks within the specified area. Replace blades if tool marks are observed. Compliance time may be adjusted upon submission of substantiating data through an FAA Maintenance Inspector.
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Compliance Time
Within the next 900 hours in service after the effective date of this AD
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Affected Aircraft
Pratt & Whitney Aircraft Model JT8D series turbofan engines including models JT8D-1, JT8D-11, JT8D-15, JT8D-15A, JT8D-17, JT8D-17A, JT8D-17AR, JT8D-17R, JT8D-1A, and others listed in the source.
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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