Airbus Alert Operators Transmission A42P001-17

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Page 1Open in PDF

CUSTOMER SERVICES DIRECTORATE 1 ROND POINT MAURICE BELLONTE 31707 BLAGNAC CEDEX FRANCE TELEPHONE + 33 (0)5 61 93 33 33

ALERT OPERATORS TRANSMISSION - AOT AOT ref: A42P001-17 Rev 00 Page 1 of 3 Date: 30-JUN-2017 © AIRBUS S.A.S. 2017. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT SUBJECT: ATA 42 – Partial loss of Avionics Network communication AIRCRAFT TYPE: A350 OUR REF.: A42P001-17 Rev 00 dated 30-JUN-2017.

1. AIRCRAFT AFFECTED All MSN

2. REFERENCED DOCUMENTATION TFU 42.41.00.002 - DM linked to CRDC partial or full message transmission loss

2.1 APPENDIX None

2.2 REFERENCES MP A350-A-24-41-XX-000ZZ-561Z-A - De-energize the Aircraft Electrical Circuits MP A350-A-24-41-XX-000ZZ-761Z-A - Energize the Aircraft Electrical Circuits

3. REASON

3.1 FACTS Further to in-service events reported to Airbus, analysis has shown a loss of communication between some avionics systems and avionics network may occur after 149 hours of continuous aircraft power-up.

After 149 hrs of continuous aircraft power-up, an internal timer embedded within each network interface equipment is automatically reset for a very short period. If during this short reset period, the aircraft system/equipment sends a message on the avionics network, the avionics system/equipment will definitely lose the capability to transmit data on the avionics network.

Depending on the affected aircraft systems or equipment, different consequences have been observed and reported by operators, from redundancy loss to complete loss on a specific function hosted on CRDC and CPIOM IMA modules.

3.2 CONSEQUENCES Loss of avionics network communication may result in the partial or full loss of some avionics systems or functions that could have a significant impact on aircraft operation.

3.3 AIM The aim of this AOT is to request a repetitive electrical power shutdown of the aircraft at an interval not exceeding 149 hours.

Page 2Open in PDF

4. SHORT TERM ACTION

4.1 PLANNING AND MANPOWER

4.1.1 ACCOMPLISHMENT TIMESCALE Operators shall ensure that aircraft is electrically de-energized at an interval not exceeding 149 hours of continuous aircraft power-on.

Aircraft electrical power shutdown should be performed three (3) days maximum after AOT reception.

4.1.2 MANPOWER The estimated time to perform this task is about 0,5 hour.

4.2 DESCRIPTION Aircraft Power cycle to be performed as per:

MP A350-A-24-41-XX-000ZZ-561Z-A - De-energize the Aircraft Electrical Circuits MP A350-A-24-41-XX-000ZZ-761Z-A - Energize the Aircraft Electrical Circuits

4.2.1 ACCESS none

4.2.2 INSPECTION REQUIREMENTS none

4.2.3 FINDINGS none

4.3 SPARES AND TOOLING none

5. FURTHER INFORMATION

5.1 FOLLOW-UP PLAN Pending embodiment of final fix (design change), operation of the aircraft must not exceed 149 hours without an electrical power-off of the aircraft.

5.2 IMPACTED DOCUMENTATION none

6. AOT APPROVAL The technical content of this document is approved under the authority of DOA nr. EASA.21J.031.

Page 3Open in PDF

7. REPORTING Please inform AIRBUS at inspection.results@airbus.com as soon as the aircraft electrical power shutdown process as described in this AOT is in place within your organization.

Questions about this AOT are to be addressed to Airbus Customer Services through TechRequest on Airbus World, selecting Maintenance & Engineering Domain, Engineering support Section and ATA 42-

00.

Best Regards, Jean-Luc MOUYSSET

VICE PRESIDENT ENGINEERING SUPPORT

CUSTOMER SERVICES Régis BONIAU VICE PRESIDENT A350 PROGRAMME