AD 94-25059

Abstract

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Canadair Model CL- 600-2B19 series airplanes, that currently requires a revision to the Airplane Flight Manual (AFM) to restrict altitude and airspeed operations of the airplane under certain conditions of hydraulic system failure. This action would add a requirement to remove certain shear pins and install certain new shear pins on the elevator flutter dampers, and replace certain shear pins at repetitive intervals. This proposal is prompted by the development of a temporary repair that entails repetitive replacement of discrepant pins in a timely manner to prevent failure of the pins. The actions specified by the proposed AD are intended to prevent undampened vibration of the elevators in normal cruise conditions; when combined with hydraulic system failures, this condition could result in reduced controllability of the airplane.

Applicability · by US fleet size

• FRANKLIN A 1 tails

Compliance instructions

Required actions, compliance times, parts/serial numbers and methods of compliance are in the Federal Register publication — not paraphrased here. Read AD on Federal Register ↗