AD 90-15-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-7R4D1 | PRATT & WHITNEY Models JT9D-7R4D1, -7R4E1, and -7R4H1 Series Engines |
| engine | Pratt & Whitney Division | JT9D-7R4E1 | PRATT & WHITNEY Models JT9D-7R4D1, -7R4E1, and -7R4H1 Series Engines |
| engine | Pratt & Whitney Division | JT9D-7R4H1 | PRATT & WHITNEY Models JT9D-7R4D1, -7R4E1, and -7R4H1 Series Engines |
Unsafe Condition
Engine overtemperature, loss of power, or engine inflight shutdown due to fuel control unit deceleration schedule, 3.0 bleed valve cylinder, and engine vane and bleed control issues.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Adjust fuel control unit deceleration schedule and reidentify FCU; modify 3.0 bleed valve cylinder; inspect 3.0 bleed valve linkages and remove engines with worn linkages before 5 cycles; adjust EVBC to specified EPR bleed trims; incorporate EVBC and FCU modifications; install 3.0 bleed dampers at next shop visit; restore first stage compressor blades at fan module overhauls.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 30 calendar days or 150 flight cycles (whichever occurs first) after the effective date for initial adjustments; within 60 calendar days or 300 flight cycles for EVBC adjustments; within one year for EVBC and FCU modifications; at next shop visit for 3.0 bleed dampers; at every fan module overhaul for compressor blade restoration.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney JT9D-7R4D1, -7R4E1, and -7R4H1 series engines installed on Airbus Industries A300/A310 aircraft.
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.