AD 70-11-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-1 | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-11 | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-15 | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-15A | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-17 | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-17A | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-17AR | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-17R | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-1A | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-1B | PRATT & WHITNEY Model JT8D Series Engines |
Unsafe Condition
Sixth stage compressor rotor disc failures caused by disc rim front face galling from blade retention tangs.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the suspect sixth stage compressor disc with a new, used, or approved reworked disc. Compliance time depends on hours in service since a 6th stage blade failure: engines with 1200+ hours must replace within 600 hours after AD effective date; those with 1200- hours must replace before 1800 hours since the blade failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated in the AD's specific timeframes based on hours in service since a 6th stage blade failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney JT8D series engines with sixth stage compressor discs P/N 586906 (wide rim) that had prior blade failures and weren't reworked per SE:RWJ:9-6-24-1 dated 24 June 1969.
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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