Airworthiness Directive · Amendment 39-12260 · 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
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
Superseded. A later AD replaced this one: AD 2001-26-12. Comply with the one in force.
Model 747-100, 747-200, 747-300, and 747SR series airplanes, certificated in any category, powered by General Electric CF6-45/50 series engines, or Pratt & Whitney JT9D-70 series engines.
This amendment adopts a new airworthiness directive (AD) that is applicable to certain 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. This action requires a detailed visual inspection of the outboard diagonal brace for heat damage and cracking; and follow-on repetitive inspections or corrective actions, if necessary. This action also provides an optional terminating action for the requirements of this AD. This action is necessary to detect and correct heat damage to the 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.
