AD 2001-12-23
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-100 | Airworthiness Directives; Boeing Model 747-100, 747-200, 747-300, 747SP, and 747SR Series Airplanes Powered by Pratt & Whitney JT9D-3 and JT9D-7 Series Engines |
| engine | Pratt & Whitney | JT9D-3 and JT9D-7 Series | Airworthiness Directives; Boeing Model 747-100, 747-200, 747-300, 747SP, and 747SR Series Airplanes Powered by Pratt & Whitney JT9D-3 and JT9D-7 Series Engines |
Unsafe Condition
Cracking of the vertical chords adjacent to the lower spar fitting, which could result in separation of the diagonal brace load path and lead to separation of the strut and engine from the airplane.
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Required Actions
Inspect the vertical chords of the aft torque bulkhead of the outboard nacelle struts using detailed visual and surface eddy current/ultrasonic inspections. If cracking is detected, repair the affected area prior to further flight using an approved method.
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Compliance Time
Within 90 days after December 13, 2000, or prior to the accumulation of 14,000 total flight cycles, whichever occurs later.
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Affected Aircraft
Boeing Model 747-100, 747-200, 747-300, 747SP, and 747SR series airplanes powered by Pratt & Whitney JT9D-3 or JT9D-7 series engines, as listed in Boeing Alert Service Bulletin 747-54A2201, dated September 28, 2000.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
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