AD/Convair/25 Main Landing Gear Piston and Axle Assembly (Cth)

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998.  The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Kelowna Flightcraft (General Dynamics/Convair) Series Aeroplanes

AD/CONVAIR/25 Main Landing Gear Piston
and Axle Assembly 8/2006

Applicability:

Convair Models 340 and 440 Series Aircraft.

Requirement:

To prevent the loss of a main landing gear piston and axle assembly due to an improperly installed gland nut, inspect the main landing gear nut installation to assure that the gland nut is installed as follows:

1.    Screw the gland nut, P/N 528062, onto the main landing gear outer cylinder, P/N 528402, until it is tight.

2.    Unscrew the gland nut until the first tapped hole is opposite one of the milled slots in the cylinder.

3.    Screw lock screw, P/N AN 501A-416-8, into the tapped hole so that the screw protrudes into the milled slot in the cylinder.

4.    Screw set screw, P/N 500305-4, into an adjacent tapped hole in the gland nut and safety the lock screw and set screw with a lockwire.

(General Dynamics/Convair Models 340 and 440 Maintenance Manuals cover this same subject.)

Note:  FAA AD 65-12-01 Amdt. 39-75refers.

Compliance:

At each time the main landing gear gland nut is reinstalled after the effective date of this AD.

This Airworthiness Directive becomes effective on 3 August 2006.

Background:

The requirements of this AD are intended to prevent the loss of a main landing gear piston and axle assembly due to an improperly installed gland nut.

James Coyne
Delegate of the Civil Aviation Safety Authority

21 June 2006