Transport i infrastruktura · 29/12/1994
Airworthiness Directives; Boeing Model 727 Series Airplanes
This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Boeing Model 727 series airplanes, that currently requires repetitive visual inspections to detect cracks of the elevator rear spar, and repair, if necessary. It also provides for a terminating action for the repetitive inspections. This action would add a one-time inspection to verify that proper clearance exists between the shear plate and the radii of the elevator rear spar on airplanes on which the terminating action has been accomplished. This proposal would also provide for an improved terminating action. This proposal is prompted by reports of cracking in the spar radii at the tab hinge location of the elevator rear spar on certain airplanes. The actions specified by the proposed AD are intended to prevent such cracking, which could result in excessive free play of the elevator control tab and possible tab flutter.