AD 2000-23-25
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 of the aft torque bulkhead of the outboard nacelle struts, which could result in separation of the diagonal brace load path.
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Required Actions
Inspect the vertical chords of the aft torque bulkhead of the outboard nacelle struts using detailed visual, ultrasonic, and surface eddy current inspections. If cracking is detected, take corrective action as necessary. Operators may defer initial inspections if Boeing Service Letter 747-SL-54-055 has been accomplished.
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Compliance Time
Within 3,000 flight cycles after accomplishment of Boeing Service Letter 747-SL-54-055, if applicable.
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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.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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