AD 73-16-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-20 | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-20J | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-3A | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-59A | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7 | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-70A | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7A | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7AH | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7F | PRATT & WHITNEY Model JT9D Engines |
| engine | Pratt & Whitney Division | JT9D-7H | PRATT & WHITNEY Model JT9D Engines |
Unsafe Condition
Failure of fourth and fifth stage turbine discs due to reduced life limits below previously approved figures.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service fourth and fifth stage turbine discs prior to reaching the revised life limit of 4000 cycles 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.
Compliance Time
within the next 25 cycles in service after the effective date of this airworthiness directive whichever comes later
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Division JT9D engines with fourth and fifth stage turbine discs P/N 646304, 694804, 618305, and 705905
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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