AD 86-03-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-7R4D | PRATT & WHITNEY Models JT9D-7R4D, 7R4E, and -7R4E4 Engines |
| engine | Pratt & Whitney Division | JT9D-7R4E | PRATT & WHITNEY Models JT9D-7R4D, 7R4E, and -7R4E4 Engines |
| engine | Pratt & Whitney Division | JT9D-7R4E4 | PRATT & WHITNEY Models JT9D-7R4D, 7R4E, and -7R4E4 Engines |
Unsafe Condition
Deterioration of fuel nozzle flow and spray cone angle characteristics could lead to engine surge, overtemperature, or inability to restart inflight.
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Required Actions
Conduct a flow check on engines with PW P/N 792842 and/or 794731 fuel nozzles after on-wing cleaning. Replace fuel nozzles with new or ultrasonically cleaned ones within specified flight cycles based on flow reduction percentage. Ground starts must use single ignition; if aborted starts occur, fuel nozzles must be cleaned and flow checked within 25 flight cycles.
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Compliance Time
Compliance is required as indicated unless already accomplished.
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Affected Aircraft
Pratt & Whitney models JT9D-7R4D, 7R4E, and -7R4E4 engines.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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