ALL OPERATORS TELEX - ALL OPERATORS TELEX SUBJECT: A340-500/600 - ATA26 – FIRE DETECTION UNIT (FDU) QUALITY ISSUE OUR REF: AOT A340-500/600-26A5024 dated 19 Apr 2011. 1.•AIRCRAFT AFFECTED All A340-500/600 aircraft.
2.•REFERENCED DOCUMENTATION REF. 1: •AMM task: 26-12-34-000-801-A - Removal of the Engine Fire Detection Unit (FDU) (1WD1) (1WD3) REF. 2:•AMM task: 26-12-34-000-802-A - Removal of the Engine Fire Detection Unit (FDU) (1WD2) (1WD4) REF. 3:•AMM task: 26-13-34-000-801-A – Removal of the APU FDU (13WG) REF. 4:•AMM task: 26-11-34-000-801-A - Removal of the MLG Bay Fire Detection Unit (FDU) (1WP) REF. 5:•AMM task: 26-12-34-400-801-A - Installation of the Engine Fire Detection Unit (FDU) (1WD1) (1WD3) REF. 6: •AMM task: 26-12-34-400-802-A - Installation of the Engine Fire Detection Unit (FDU) (1WD2) (1WD4) REF. 7: •AMM task: 26-13-34-400-801-A – Installation of the APU FDU (13WG) REF. 8: •AMM task: 26-11-34-400-801-A – Installation of the MLG Bay Fire Detection Unit (FDU)(1WP)
3.•REASON 3.1•FACTS FDU supplier L’HOTELLIER has reported a potential soldering quality issue on one of the internal cards of some FDU P/N 3711-00. This soldering quality issue, limited to a batch of FDU units, was caused by the application of a specific manufacturing process. This FDU P/N 3711-00 can be installed on A330 or A340 aircraft, all models. 3.2•CONSEQUENCES This issue could lead to an undetected loss of the fire detection function in the area that is monitored by the FDU (Engine or Main Landing Gear Bay or APU). 3.3•AIM The aim of this AOT is to provide operators with the list of serial numbers of affected FDU units. This batch includes units delivered by L’HOTELLIER as spare parts and units delivered on aircraft from the Airbus production line. The units currently fitted on aircraft have to be replaced at the earliest maintenance opportunity but no later than 1000 FH after receipt of this AOT.
3.4•LIST OF AFFECTED FDUs - Twenty three (23) FDU P/N 3711-00 are affected:
ZL0683 ZL0722 ZL0725 ZL0730 ZL0738 ZL0743 ZL0770 ZL0788 ZL0718 ZL0723ZL0727 ZL0731 ZL0740 ZL0745 ZL0772 ZL0804 ZL0721 ZL0724 ZL0729 ZL0736 ZL0742 ZL0747 ZL0775

4.•SHORT TERM ACTION 4.1•PLANNING AND MANPOWER 4.1.1•PLANNING a)•Within 1000 FH after receipt of this AOT, identify and replace the suspect FDU S/Ns listed in paragraph 3.4 of this AOT, in accordance with the instructions provided in paragraph 4.2 below. Send suspect units back to L’HOTELLIER for repair (see focal point information in paragraph 4.3.1. of this AOT). a)•Upon receipt of this AOT, make sure that no FDU S/N listed in paragraph 3.4 is installed on aircraft unless it has been repaired by L’HOTELLIER (refer to paragraph 5. of this AOT).
4.1.2•MANPOWER -•Approximately 0.25 hour is required for access to the avionics bay. -•Approximately 0.25 hour is required to identify part number and serial number of FDU FIN 1WD1 / 1WD2 / 1WD3 / 1WD4 / 13WG / 1WP. -•Approximately 0.5 hour is required to remove and install a FDU.
4.2•DESCRIPTION Within 1000 FH upon receipt of this AOT, apply the following instructions: 4.2.1•Follow “JOB SET UP” steps of AMM Tasks Ref. 1 to 4 as applicable for removal of FDU 1WD1, 1WD2, 1WD3, 1WD4, 13WG and 1WP. 4.2.2•Visually identify FDU P/N and S/N for position 1WD1 and 1WD2 and 1WD3 and 1WD4 and 13WG and 1WP. Note: a review of aircraft maintenance records is acceptable in lieu of the visual inspection if P/N and S/N of the installed FDU can be conclusively identified from that review. 4.2.3•Compare FDU P/N and S/N to the list of suspect units provided in paragraph 3.4 of this AOT. 4.2.4•If listed in paragraph 3.4 of this AOT, no later than 1000 FH upon receipt of this AOT, remove and replace the FDU as per the applicable Ref. 1 to 8 AMM task. 4.3•MATERIAL INFORMATION 4.3.1•Material – Price and availability Upon receipt of a free of charge purchase order, L’HOTELLIER will provide FDU free of charge to replace suspect units. For more details and logistics, please contact L’HOTELLIER focal point:Ms. Catherine Bassin Repair Assistant Tel: 33 (0) 1.55.59.09.72 Fax: 33 (0) 1.46.66.66.71 Email: Catherine.Bassin@hs.utc.com 4.3.2• Tooling Not applicable.
5.•FURTHER ACTION L’HOTELLIER will rework the suspect FDUs. Rework will be identified with a letter “R” added to the serial number on the FDU identification plate. The FDUs listed in paragraph 3.4 of this AOT that are marked with serial number followed by “R” letter are no longer concerned by this AOT.
6.•AOT APPROVAL The technical content of this AOT has been approved under the authority of EASA design organization approval number EASA 21J.031. It is expected that the content of this AOT will be rendered mandatory by the Airworthiness Authorities. 7.•REPORTING/ACKNOWLEDGMENT Operators are requested to acknowledge receipt of this AOT within 48 hours after receipt to: Ms. E. GAILLANOU, SEEE, E-mail: emilie.gaillanou@airbus.com Fax: +33/ (0)5 61 93 36 14 This acknowledgement can be made through the Airbus FSR when available. Results or questions about the technical content of this AOT are to be addressed to: Mr. Jerome Real Pneumatics, Ice and Fire Protection (SEEE4) Phone: +33 (0)5 61 93 71 85 Fax: +33 (0)5 61 93 36 14 mailto: jerome.real@airbus.com

Best regards,
P.GOURDON VICE PRESIDENT A330 / A340 PROGRAM CUSTOMER SERVICES DIRECTORATE
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