Airworthiness Directive · Amendment 39-11431 · Boeing Model 757 Series Airplanes Equipped With Rolls Royce Engines
Boeing Model 757 Series Airplanes Equipped With Rolls Royce Engines
Superseded. A later AD replaced this one: AD 2004-12-07. Comply with the one in force.
Model 757 series airplanes equipped with Rolls Royce engines, line numbers 1 through 735 inclusive; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 757 series airplanes equipped with Rolls Royce RB211 engines, that requires modification of the nacelle strut and wing structure. This amendment is prompted by reports indicating that the actual operational loads applied to the nacelle are higher than the analytical loads that were used during the initial design. Such an increase in loading can lead to fatigue cracking in primary strut structure prior to an airplane's reaching its design service objective. The actions specified by this AD are intended to prevent fatigue cracking in primary strut structure and consequent reduced structural integrity of the strut.
