Boeing Proposes New Airworthiness Directive for 747-100, 747-200, 747-300, and 747SR Series Airplanes

Summary

Boeing is proposing a new airworthiness directive (AD) to address heat damage to the outboard diagonal brace on certain 747 models, which could lead to cracking, fracture, and separation of the strut and engine. The proposed AD would require the replacement of existing sealants with heat-resistant sealants as a terminating action.