AD 74-10-05 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-20 | PRATT & WHITNEY AIRCRAFT Model JT9D-7, JT9D-7A, and JT9D-20 Engines |
| engine | Pratt & Whitney Division | JT9D-7 | PRATT & WHITNEY AIRCRAFT Model JT9D-7, JT9D-7A, and JT9D-20 Engines |
| engine | Pratt & Whitney Division | JT9D-7A | PRATT & WHITNEY AIRCRAFT Model JT9D-7, JT9D-7A, and JT9D-20 Engines |
Unsafe Condition
Turbine blade or disc failures resulting from deflection of the second stage turbine nozzle guide vane inner support.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform radioisotope inspections in accordance with specified maintenance manuals. Inspections must be repeated at intervals based on engine operation and vane part numbers. Engines with excessive deflection must be removed from service or reinspected at shorter intervals.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as follows unless already accomplished. Inspections must be conducted within specified hours time in service or by certain deadlines based on engine operation and vane part numbers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Aircraft JT9D-7, JT9D-7A, and JT9D-20 engines with specific second stage turbine nozzle guide vane part numbers (e.g., 708952, 719552, 728752, etc.) as detailed in the AD.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.