AD/DHC-8/119 - Main Landing Gear Up-Lock 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.

Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes AD/DHC-8/119 Main Landing Gear Up-Lock Assembly 5/2006

Applicability: Bombardier Inc. DHC-8, Models 400, 401 and 402, serial numbers 4001 and 4003 through 4087 fitted with main landing gear up-lock assembly Part Number 46500-3 or 46500-5. Requirement: 1. (a) Amend all copies of the Aircraft Flight Manual (AFM), PSM 1-84-1A (Models 400, 401, 402) by adding the following procedure opposite to page 4-21-1. Advise all flight crews of these changes.

Note: The amendment required may be accomplished by inserting a copy of this directive into the affected section of the Airplane Flight Manual.

If ONE main landing gear fails to extend after performing landing gear extension per normal procedures given in paragraph 4.3.7 and alternate extension procedures per paragraph 4.21.1 of the AFM:

1. Visually confirm that the affected gear has not extended and that the associated doors have opened.

2. Ensure No. 2 hydraulic system pressure and quantity are normal and the following landing gear advisory lights are illuminated: selector lever amber, gear green locked down (nose and non-affected main gear), red gear unlocked (affected main gear) and all amber doors open.