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AD/A320/206 - Landing Gear Selector Valves

Authoritative Version
AD/A320/206 Airworthiness Directives/Pt 105 — Aircraft as made
Landing Gear Selector Valves
Administered by: Infrastructure and Transport
Exempt from sunsetting by the Legislative Instruments Act 2003 s 54(2) item 9
Registered 16 May 2007
Tabling HistoryDate
Tabled HR21-May-2007
Tabled Senate12-Jun-2007
Date of repeal 14 Mar 2011
Repealed by CASA ADCX 005/11 - Revocation of Airworthiness Directives

 

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.

Airbus Industrie A319, A320 and A321 Series Aeroplanes

AD/A320/206

Landing Gear Selector Valves

6/2007

 

Applicability:

AIRBUS A318, A319, A320 and A321 aircraft, all models, all serial numbers (MSN). Aircraft MSN’s 2389, 2392, 2393, 2396, 2398, 2403, 2405, 2407, 2409, 2410, 2411, from 2413 through to 2439, 2441, and MSN above 2441 on which no replacement of the Landing Gear (LG) selector valve 40GA or the LG door selector valve 41GA has been performed since aircraft delivery from Airbus are compliant with the requirements of this AD.  Aircraft on which LG selector valve 40GA and LG door selector valve 41GA have the duplicate inspection "DI" or “DI-BE” recorded on their amendment plates are compliant with the requirements of this AD.

Reminder:  It is the responsibility of the operator to ensure that any selector valve replaced on aircraft after having complied with this AD, still complies with the requirements of this AD.

Requirement:

1.    Inspect and replace if necessary the LG selector valve 40GA and the LG door selector valve 41GA in accordance with the instructions given in AIRBUS Service Bulletin A320-32-1290.

2.    Repeat the inspection detailed in Requirement 1 of this AD and carry out any corrective actions as required.

The installation of LG selector valve 40GA or LG door selector valve 41GA, that do not have the duplicate inspection "DI" or “DI-BE” recorded on their amendment plates, is possible provided that it will be inspected within 800 FC after installation, in accordance with the instructions given in AIRBUS Service Bulletin A320-32-1290.

Note:  EASA AD 2007-0065 dated 14 March 2007 refers.

Compliance:

1.    For aircraft that have accumulated up to 20,000 flight cycles (FC) at the effective date of the AD - within 4,500 FC after the effective date of this AD, but not exceeding 20,800 FC from first flight.

For aircraft that have accumulated over 20,000 FC at the effective date of the AD - within 800 FC after the effective date of this AD.

2.    At intervals not exceeding 20,000 FC or 89 months, whichever occurs first.

 

This Airworthiness Directive becomes effective on 7 June 2007.

 

Background:

After a push back from the gate, an A320-200 aircraft was preparing to initiate taxi, when a NLG uncommanded retraction occurred, and then the aircraft abruptly hit the ground.  Investigations revealed that the retract condition is caused by a combination of a faulty MLG proximity switch, a power interruption to LGCIU's and an internal hydraulic leak through the LG selector valve 40GA.  The internal hydraulic leak through the LG selector valve 40GA was due to a broken seal in one of the end cap chambers for the valve spool.  As a corrective action, a duplicate inspection (DI or DI-BE) for these valves has been introduced in production, and the Component Maintenance Manual (CMM) has been revised.  Untimely unlocking and/or retraction of the NLG, whilst on the ground, could cause injury to ground personnel and significant structural damage to the aircraft.  This AD mandates the inspections of the LG selector valve 40GA and the LG door selector valve 41GA, to identify a possible hydraulic leak.


David Punshon
Delegate of the Civil Aviation Safety Authority

24 April 2007