Airworthiness Directive · Amendment 39-11163 · Boeing Model 747-200, -300, and -400 Series Airplanes
Boeing Model 747-200, -300, and -400 Series Airplanes
Model 747-200 and -300 series airplanes equipped with General Electric Model CF6-80C2 series engines, and Model 747- 400 series airplanes; as listed in Boeing Service Bulletin 747-54- 2155, Revision 2, dated June 6, 1996, certificated in any category; except those airplanes on which modifications of the strut/wing structure have been accomplished in accordance either of the following AD's: AD 95-13-05, amendment 39-9285 (60 FR 33333, June 28, 1995), or AD 95-13-06, amendment 39-9286 (60 FR 33338, June 28, 1995).
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747-200, -300, and -400 series airplanes, that requires replacement of fuse pins in the upper link, midspar fittings, and diagonal brace of the nacelle strut with new corrosion-resistant pins. This amendment is prompted by reports of cracked fuse pins in the upper link, midspar fittings, and diagonal brace of the nacelle strut due to fatigue and corrosion. The actions specified by this AD are intended to prevent cracking or corrosion of the fuse pins of the nacelle strut, which could result in failure of the fuse pin and strut-to-wing attachment, and consequent loss of the strut and separation of the engine from the airplane.
