AD 94-08-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-7R4D | Airworthiness Directives; Pratt & Whitney JT9D-7R4 Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-7R4D1 | Airworthiness Directives; Pratt & Whitney JT9D-7R4 Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-7R4E | Airworthiness Directives; Pratt & Whitney JT9D-7R4 Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-7R4E1 | Airworthiness Directives; Pratt & Whitney JT9D-7R4 Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-7R4E4 | Airworthiness Directives; Pratt & Whitney JT9D-7R4 Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-7R4G2 | Airworthiness Directives; Pratt & Whitney JT9D-7R4 Series Turbofan Engines |
| engine | Pratt & Whitney Division | JT9D-7R4H1 | Airworthiness Directives; Pratt & Whitney JT9D-7R4 Series Turbofan Engines |
Unsafe Condition
Flutter-induced fan blade fractures leading to uncontained engine failure and possible aircraft damage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform initial and repetitive visual or eddy current inspections of fan blade leading edges within specified cycles in service (CIS), rework or replace fan blades as necessary. Install or rework fan blade sets with 52 degree shroud angles within 1 or 2 years after the effective date depending on engine model.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Initial inspection within 200 cycles in service (CIS) after the effective date; repetitive inspections every 200 CIS. Install shroud modifications within 1 year (JT9D-7R4H1) or 2 years (other models) after effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney JT9D-7R4 series turbofan engines, including models JT9D-7R4D, JT9D-7R4D1, JT9D-7R4E, JT9D-7R4E1, JT9D-7R4E4, JT9D-7R4G2, and JT9D-7R4H1, installed on Boeing 747/767 and Airbus 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
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