Airworthiness Directive · Amendment 39-11212 · Boeing Model 747-300 and -400 Series Airplanes
Boeing Model 747-300 and -400 Series Airplanes
Model 747-300 series airplanes, as listed in Boeing Alert Service Bulletin 747-53A2428, dated December 17, 1998; and Model 747-400 series airplanes equipped with a Boeing installed E-42 satellite communications (SATCOM) rack; certificated in any category.
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Boeing Model 747-300 and -400 series airplanes. This action requires repetitive inspections of the E-42 satellite communications (SATCOM) rack and fuselage (supporting) structure to detect cracking in the area surrounding the fastener holes, and to detect broken and missing fasteners; and corrective actions, if necessary. This amendment is prompted by reports indicating that cracking and broken and/or missing fasteners were found on the E- 42 SATCOM equipment rack structure that attaches to the fuselage structure. The actions specified in this AD are intended to detect and repair cracking of the E-42 SATCOM rack and its supporting structure, which could result in the SATCOM equipment falling from the rack, loss of SATCOM capabilities, injury to passengers, and reduced controllability of the airplane.
