Regulacje i polityka gospodarcza · 30.10.2001

Airworthiness Directives; Boeing Model 747 Series Airplanes

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 747 series airplanes. This proposal would require repetitive inspections for cracking of the skin, bear strap, and sill chord of the lower lobe cargo door cutout, and repair, if necessary. This proposal also provides, for certain airplanes, an optional modification of the lower lobe cargo door cutout, which ends the pre-modification repetitive inspections, but would necessitate new post-modification repetitive inspections after a certain time. This action is necessary to find and fix cracking of the skin, bear strap, and sill chord of the lower lobe cargo door cutout, which could lead to reduced structural integrity of the lower lobe cargo door cutout, and result in rapid depressurization of the airplane. This action is intended to address the identified unsafe condition.