AD 2001-26-12
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 or 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 or Pratt & Whitney JT9D-70 Series Engines |
Unsafe Condition
Heat damage to the forward end of the outboard diagonal brace can cause cracking and fracture, potentially leading to loss of the diagonal brace load path and separation of the strut and engine from the airplane.
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Required Actions
Replace any existing sealant with heat-resistant sealant as a terminating action for repetitive inspections. Inspect the outboard diagonal brace for heat damage and cracking. Perform follow-on repetitive inspections and corrective actions if necessary.
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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 or Pratt & Whitney JT9D-70 series engines.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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