AD/A320/157 Amdt 2 Liquid Crystal Display Units (Cth)
AIRWORTHINESS DIRECTIVE
On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/A320/157 Amdt 1 and issues the following 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/A320/157 Amdt 2 | Liquid Crystal Display Units | 7/2006 |
Applicability: | A318, A319, A320, A321 series aeroplanes, all serial numbers, that have EIS2 (Electronic Instrument System) LCD (Liquid Crystal Display) Display Units installed either by Airbus modification 30368 or 31495 during production or Airbus Service Bulletin (SB) A320-31-1193 or A320-31-A1198 whilst in service. |
| Note 1: This Directive is not applicable to aeroplanes that have Airbus modification 35270 (installation of EIS1 instead of EIS2) incorporated during production. | |
| Note 2: No further action is required for aeroplanes already compliant with Amendment 1 of this Directive. | |
Requirement: | 1. The following dispatch limitations are mandatory for all flights: |
| For aircraft equipped with EIS2 LCD Display Units and with conventional standby instruments: - Dispatch with the standby IAS (Indicated Airspeed) indicator inoperative (MMEL 34-21-01) is no longer authorised. - Dispatch with inoperative standby horizon or inoperative standby altimeter may be authorised provided that the crew maintains VMC conditions during the entire flight and day-light conditions. For aircraft equipped with EIS2 LCD Display Units and with the Integrated Standby Instrument System (ISIS): - Dispatch with the ISIS airspeed function inoperative (MMEL - Dispatch with inoperative ISIS horizon function or inoperative ISIS altitude function may be authorised provided that the crew maintains VMC conditions during the entire flight and day-light conditions. Reminder: For dispatch with one Display Unit inoperative as per MMEL |
| Incorporation of the Master Minimum Equipment List (MMEL) changes or a copy of this Directive in the Aircraft Operations Manual is a satisfactory method of compliance with this Requirement. | |
| 2. The following operational limitations are mandatory for all flights of aeroplanes without EIS2 standard 4.2 (Airbus modification 34571 or Airbus SB | |
| LOSS OF ALL DISPLAY UNITS This Temporary Revision of the Aircraft Flight Manual gives the procedure to be followed in case of loss of all Display Units (DU). Monitor the flight by using standby instruments. Wait at least 40 seconds for automatic DU recovery. • If one or more DU is not automatically recovered after 40 seconds: • If all DUs are lost again when switching a given DU back to ON: After 40 seconds, switch them back to ON except the given DU which must be left permanently OFF. | |
| Incorporation of Aircraft Flight Manual (AFM) Temporary Revision TR 4.02.00/22 or a copy of this Directive in the Aircraft Operations Manual as well as in the AFM is a satisfactory method of compliance with this Requirement. | |
| 3. Remove the operational limitations imposed by Requirement 2 from the AFM and the Aircraft Operations Manual. | |
| Note 3: EASA AD 2006-0108 refers. | |
Compliance: | For Requirement 1 - Remains unchanged as ‘Before 22 July 2004’. |
| For Requirement 2 - As of the effective date of Amendment 1. | |
| For Requirement 3 - Immediately following embodiment of Airbus modification 34571 or Airbus SB A320-31A1220. | |
| This Amendment becomes effective on 6 July 2006. |
Background: | The Direction Générale de l’Aviation Civile of France has advised that an A320 operator reported the erratic behavior of all EIS2 LCD Display Units in cruise for duration of three minutes with a total loss LCD Display Units for 30 seconds. As a precaution the pilot disconnected the autopilot and standby instruments were used. All Display Units were finally recovered and the flight continued normally. |
| Analysis confirmed that the three Display Management Computers have received erroneous data from one LCD Unit. Airbus issued Operators Information Telex (OIT) and Flight Operations Telex (FOT) SE 999.0114/03/VHR Revision 1, which gives the Master Minimum Equipment List (MMEL) changes resulting from this event and operational recommendations to be followed in case of all Display Units failed with INVALID DATA display. | |
| Several similar events have been reported on the Airbus Single Aisle fleet since the issue of the OIT, showing the need to make sure that the crew is well informed of the procedure to apply in similar situations. This procedure “Loss of all display units” is detailed in A318/319/329/321 Flight Manual Temporary Revision (AFM TR) 4.02.00/22. | |
| Amendment 1 introduced relief from the operational limitations following embodiment of Airbus modification 34571 or Airbus SB A320-31A1220. | |
| This Amendment results from advice from the European Aviation Safety Agency (EASA) that aeroplanes with Airbus modification 35270 incorporated during production are not affected by this Directive. | |
| This original issue of this Airworthiness Directive became effective on 17 July 2004. | |
| Amendment 1 became effective on 25 November 2004. |
James Coyne
Delegate of the Civil Aviation Safety Authority
24 May 2006
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