Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Fokker Model F27 Mark 100, 200, 300, 400, 500, 600, and 700 series airplanes. This proposal would require replacement of the actuating ram bobbin and O-ring seals of the main landing gear (MLG), with new bobbins and improved O-ring seals. This proposal is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by the proposed AD are intended to prevent loss of dampening of the MLG actuating ram, which could result in failure of the MLG lockstruts, and consequent structural damage to the airplane.