Electronic Instrument System Display Units 13/2005
Applicability: Airbus A330 aeroplanes, all certified models, all serial numbers, equipped with Electronic Instrument System EIS 2 software versions as follows:
a. Version L4-1 installed through either modification 51153 during production
or Airbus Service Bulletin (SB) A330-31-3056 or A330-31-3057 whilst in
service.
b. Version L5 installed through either modification 51974 during production or
Airbus SB A330-31-3056 or A330-31-3069 whilst in service.

Requirement: Amend the Aircraft Flight Manual (AFM) to incorporate the following operational procedure, this may be accomplished by inserting a copy of this Directive or AFM Temporary Revision (TR) 4.03.00/26 in the AFM:
“At each flight crew change, switch OFF all displays units before completing
Parking Check-list.”
Note 1: As the flight crew will set all Display Units (DU) back ON during the next
preliminary cockpit preparation, an electrical cut off of more than 5 seconds is thus
ensured, preventing automatic reset of DUs.
Note 2: Any later revision of the TRs approved by the European Aviation Safety
Agency or any general AFM revision including this procedure is acceptable for
compliance with this Directive.
Note 3: This operational procedure has been published in Operations Engineering
Bulletin (OEB) 59/1.
Note 4: All Operator Telex (AOT) A330-31A3092 is cancelled.
Note 5: DGAC AD F-2005-166R1 (EASA approval 2005-6378) refers.

Compliance: Before 16 November 2005.
This Amendment becomes effective on 10 November 2005.

Background: The Direction Générale de l’Aviation Civile of France (DGAC) has advised that an operator reported the simultaneous blanking of three EIS DUs on an A330 aircraft
during flight. These DUs went blank and displayed the message “INVALID
DISPLAY UNIT”. The DU’s were recovered automatically after approximately 40
seconds and the flight was continued normally.
The analysis of Display Management Computer (DMC) data confirmed the three DUs
had undergone a simultaneous automatic reset followed by a power on self-test. The
investigation shows that after a continuous power on of a DU for more than six days,
an internal timer reaches a limit that provokes an automatic reset.
A situation where both the EIS DUs and standby instruments are simultaneously
unavailable may have unsafe consequences in certain phases of flight.
The original issue of this Directive required the periodic ‘switching off’ procedure to
be performed by flight crew in accordance with DGAC AD UF-2005-166 before each
crew change.
This Amendment continues the ‘switching off’, but also requires the AFM to be
amended.
The original issue of this Directive became effective on 28 September 2005.

FMI: www.casa.gov.au