Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Short Brothers Model SD3- SHERPA, SD3-60 SHERPA, SD3-30, and SD3-60 series airplanes. This proposal would require replacement of the existing bolts that secure the elevator control torque tube bearing housing retaining plate with hex head bolts. 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 reduced movement of the elevator controls and consequent reduced controllability of the airplane, as a result of bolts coming loose on the elevator control torque tube bearing housing retaining plate.