Airworthiness Directives; Boeing Model 747-300 and -400 Series Airplanes Equipped With BFGoodrich Stretched Upper Deck Evacuation Slides, Part Number 7A1323-( )

Résumé

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Boeing Model 747-300 and -400 series airplanes equipped with certain stretched upper deck evacuation slides manufactured by BFGoodrich. This proposal would require modification of the slide's main restraint strap, regulator assembly, and turbo fan flapper retaining roll pins. This proposal is prompted by reports of loss of air pressure and non-inflation of the inflatable tubes of the slide due to problems associated with the restraint strap, regulator assembly, and turbo fan flapper retaining roll pins. The actions specified by the proposed AD are intended to prevent loss of air pressure or non-inflation of the inflatable tubes of the slide, which could impede the successful evacuation of passengers from the airplane during an emergency.