AD/DHC-8/74 - Oxygen - Deletion of Selector Stop on Flow Control Valve (Cth)

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES

Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes

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 39.1 (1) of CAR 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.

AD/DHC-8/74 Oxygen - Deletion of Selector Stop on Flow Control Valve

11/2000

Applicability: DHC-8 aircraft Models 102, 103, 106, 201, 202, 301, 311, 314, and 315, serial numbers 003 to 468 inclusive and 472 with all-passenger oxygen configurations CR 835CH00009, CR 835CH00011, CR 835CH02001, CSI 82279 or CSI 82093 installed.

Requirement: Incorporate Bombardier Modification 8/2989 (Deletion of Selector Stop on Flow Control Valve) in accordance with Bombardier Service Bulletin 8-35-19 dated 17 August 2000.

Note: Transport Canada AD CF-2000-26 refers.

Compliance: Unless previously accomplished, within 90 days time in service after the effective date of this Directive.

This Airworthiness Directive becomes effective on 2 November 2000.

Background: This Directive addresses aircraft fitted with an Automatic Passenger Presentation of Oxygen System (APPOS). Field reports have indicated that the selector stop on the flow valve control panel can be installed incorrectly, preventing the selection of either "ON" or "AUTO". In such a case, oxygen would be prevented from being available to passengers in case of an emergency.