Airworthiness Directive · Amendment 39-12415 · Boeing Model 707 and 720 Series Airplanes
Boeing Model 707 and 720 Series Airplanes
Superseded. A later AD replaced this one: AD 2005-08-15. Comply with the one in force.
Model 707 and 720 series airplanes, as listed in Boeing Service Bulletin 1541, Revision 3, dated February 15, 1967; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 707 and 720 series airplanes, that requires a preventive modification of the front spar fitting on the outboard engine nacelle. This action is necessary to prevent fatigue cracking of the front spar fitting on the outboard engine nacelle, which could reduce the structural integrity of the nacelle, and result in separation of the engine from the airplane. This action is intended to address the identified unsafe condition.
