AD 2007-17-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Pratt | & Whitney (PW) JT9D-7R4 Series Turbofan | Airworthiness Directives; Pratt & Whitney (PW) JT9D-7R4 Series Turbofan Engines |
Unsafe Condition
Uncontained failure of the 2nd stage high pressure turbine (HPT) air seal assembly, caused by the air seal assembly brace disengaging from the air seal due to insufficient cooling air flow.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove reduced cooling flow 2nd stage HPT vane assemblies, part numbers 797282, 796972, 800082, 800072, 803182, 803282, and 822582, installed in 2nd stage HPT vane cluster assemblies P/Ns 797592, 797372, 799872, 799782, and 822572. Perform a visual and a fluorescent penetrant inspection (FPI) of the 2nd stage HPT air seal assembly, P/N 815097.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney JT9D-7R4E1, -7R4E4, -7R4G2, and -7R4H1 turbofan engines installed in Boeing 767-200, Airbus A300-600, and A310-300 airplane models.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.