AD 2001-12-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 747-100 | Airworthiness Directives; Boeing Model 747-100, 747-200, 747-300, and 747SR Series Airplanes Powered by General Electric CF6-45/50 and Pratt & Whitney JT9D-70 Series Engines |
| engine | Pratt & Whitney | JT9D-70 Series | Airworthiness Directives; Boeing Model 747-100, 747-200, 747-300, and 747SR Series Airplanes Powered by General Electric CF6-45/50 and Pratt & Whitney JT9D-70 Series Engines |
Unsafe Condition
Heat damage to the outboard diagonal brace, which could cause cracking or fracture of the diagonal brace, and possible loss of the diagonal brace load path and consequent separation of the strut and engine from the airplane.
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Required Actions
Perform a detailed visual inspection of the outboard diagonal brace for heat damage and cracking. Take follow-on repetitive inspections or corrective actions, if necessary. Corrective actions include replacing the diagonal brace, installing backup plates, and replacing the existing sealant with heat-resistant BMS 5-63 sealant.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 747-100, 747-200, 747-300, and 747SR series airplanes powered by General Electric CF6-45/50 and Pratt & Whitney JT9D-70 series engines.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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