AD 71-24-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JFTD12A-4A (T73P-1) | PRATT & WHITNEY Model JT12A and JFTD12A Series Engines |
| engine | Pratt & Whitney Division | JFTD12A-5A (T73-P-700) | PRATT & WHITNEY Model JT12A and JFTD12A Series Engines |
| engine | Pratt & Whitney Division | JT12A-6 | PRATT & WHITNEY Model JT12A and JFTD12A Series Engines |
| engine | Pratt & Whitney Division | JT12A-6A | PRATT & WHITNEY Model JT12A and JFTD12A Series Engines |
| engine | Pratt & Whitney Division | JT12A-8 | PRATT & WHITNEY Model JT12A and JFTD12A Series Engines |
Unsafe Condition
Compressor rotor disc failure as a result of reduced life from traces of lead.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service listed compressor rotor discs prior to reaching the revised life limit or within the next 30 cycles in service after the specified dates (November 26, 1971 or December 10, 1973), whichever comes later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to reaching the revised life limit or within the next 30 cycles in service after the specified dates (November 26, 1971 or December 10, 1973), whichever comes later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Division JFTD12A-4A (T73P-1), JFTD12A-5A (T73-P-700), JT12A-6, JT12A-6A, JT12A-8 engines with compressor rotor discs listed in Service Bulletin No. 3421 (dated August 4, 1971) and Revision No. 3 (dated December 10, 1973).
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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