Airworthiness Directives; British Aerospace Model Viscount 744, 745, 745D, and 810 Series Airplanes

Résumé

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to all British Aerospace Model Viscount 700, 800, and 810 series airplanes, that currently requires repetitive inspections to detect cracks and corrosion in the inboard and outboard engine nacelle structures on the wings; replacement of any cracked fittings and mating struts; and treatment or replacement of any corroded fittings or struts. This action would require repetitive inspections to detect cracking or corrosion of the eye end fittings of the outboard engine lower support or of the bore of the taper pin holes, and repair, if necessary. This action also would limit the applicability of the existing AD. This proposal is prompted by reports of cracked and separated lower eye end fittings. The actions specified by the proposed AD are intended to detect and correct cracking of the eye end fittings of the outboard engine lower support, which could result in reduced structural integrity of the engine nacelle support structures.