AD/OXY/6 Amdt 1 - Passenger Oxygen Masks (Cth)

AIRWORTHINESS DIRECTIVE

On the commencement date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below repeals Airworthiness Directive (AD) AD/OXY/6 and issues the following AD under subregulation 39.001 (1) of CASR 1998 and subsection 33 (3) of the Acts Interpretation Act 1901. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct an 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.

Oxygen Systems

AD/OXY/6 Amdt 1 Passenger Oxygen Masks 23/2017

Applicability:	02 Corporation Oxygen Mask Presentation Unit Part Numbers as follows:
	121-040-04	150-004-03	151-020
	150-002	150-004-04	151-020-02
	150-002-01	150-004-05	151-020-04
	150-002-02	150-004-06	152-001
	150-002-03	150-004-07	l52-001-0l
	150-002-04	150-004-08	152-001-04
	150-002-05	150-004-12	152-001-05
	150-002-08	150-005	152-001-08
	150-003T	150-006	152-00l-13
	150-003-04T	150-022	152-003
	150-004	151-010	152-004
	150-004-01	151-010-02	152-004-05
	150-004-02	151-010-04
	Note 1:  Aircraft known to be fitted with the above part number Oxygen Mask Presentation Units include but are not limited to, British Aerospace 125-800A; Challenger CL600-lAII, CL600‑2B16, and CL600-2A12; Gulfstream G-1159, G-1159A, G-1159B, and G-IV and Falcon 20. Note 2.  FAA AD 91-10-05 Amendment 39-6989 refers.
Requirement:	To prevent malfunctioning of the lanyard release pin that could prevent the flow of oxygen to a passenger in an emergency situation, do the following: (a)   With the oxygen system of the aircraft activated, perform a test of the lanyard release pins by doing the following:
(1)   Open the passenger mask presentation units and allow the mask assemblies to drop out. (2)   Prepare a 3.4 kg (7.5 lbs) weight with an attached string and hook, (eg, spring, clip, etc). (3)   Attach the hook to the lanyard attaching point of each mask actuator pin without dropping the weight and allow the weight to hang from the lanyard attaching point. (b)   If the pin pulls free from the oxygen actuator valve at 3.4 kg or less hanging weight, then the pin is serviceable and the unit may be returned to service. (c)   If the pin does not pull free from the oxygen actuator valve, prior to further flight do the following: (1)   Replace the pin with either 02 Corporation part number 100-111-2 or 100-111-3, which has a 20-degree angle and a rounded nose. Note 3:  The replacement pin is available from Mr Burt Parry, O2 Corporation, 3522 N. Comotara, Wichita, Kansas 67226 USA; Telephone [phone]; Facsimile [phone]. (2)   Test the replacement pin installation in accordance with the test requirements of paragraph (a) of this AD. If the pin pulls free from the oxygen actuator valve at 3.4 kg or less of hanging weight, then the pin is serviceable and the unit may be returned to service.
Compliance:	Within 30 days after the commencement date of this AD, unless previously accomplished. Note 4:  Previous compliance with the requirements in AD/OXY/6 constitutes compliance with the equivalent requirements in this AD.
This AD commences on 10 November 2017.
Background:	An incident occurred where an inoperative oxygen supply system resulted because a lanyard pin could not be readily pulled. The actions specified by this AD are intended to prevent a malfunction that could result in an inoperative passenger oxygen system and possible serious physical impairment of passengers during an emergency event. Amendment 1 of this AD is issued to correct a part number in the second line of the applicability table of this AD.

Ben Wilson
Delegate of the Civil Aviation Safety Authority

2 November 2017