Subject: ATA 29 - Hydraulic Power - Inspection of electrical feeder

cables and green hydraulic system electrical motor pump pressure hose FROM : AIRBUS CUSTOMER SERVICES TOULOUSE ALL OPERATORS TELEX - ALL OPERATORS TELEX SUBJECT: ATA29 - HYDRAULIC POWER - Inspection of electrical feeder cables and Green hydraulic system electrical motor pump pressure hoses at frame 54, for Parker (Formerly Abex) configuration. OUR REF: AOT A310 - 29A2102 dated 12 April 2011 1. AIRCRAFT AFFECTED All A310 - 200/
- 300 aircraf t equipped with Parker (formerly Abex) Hydraulic Electrical Motor Pump (EMP) models. 2. REFERENCED DOCUMENTATION REF.1: AOT A310 - 29A2101 Rev 01 dated 12 April 2011 for one time visual inspection of the Eaton (formerly Vickers) installation condition. REF .2: IPC 29 - 21 - 03 Figure 1A (Green Parker EMP installation). REF.3: IPC 29 - 21 - 03 Figure 1D (Green Parker EMP installation. REF.4: IPC 24 - 92 - 03 Figure 17 (Green Parker EMP electric feeder cable installation at Frame 54 zone 147). REF.5: AMM 20 - 23 - 11 Paragrap h 7.Permitted damage and defects on flexible hydraulic hoses. REF.6: ESPM 20 - 53 - 21 Repair of standard cables (Damage check and repair procedures). REF.7: ESPM 20 - 53 - 31 Repair of convoluted conduits (Damage check and repair procedures). REF.8: AMM 29 - 21 - 11 Removal / installation of the Green EMP REF.9: AMM 20 - 23 - 14 Paragraph 2.B. (4) Installation of spiralex band (Spiral strip) NSA849000. 3. REASON 3.1 FACTS While preparing the aircraft, an A310 - 300 equipped with Eaton (formerly Vickers) Green EMPs, for to wing from the hangar, the two Green EMPs were selected ON to close the MLG Doors. Then when the Green/Blue and Green/Yellow Power Transfer Units (PTUs) were selected ON to retract the Flaps/Slats, a large hydraulic haze (sprayed fluid) with a burnt electri cal smell came from the LH MLG wheel well bay. The electrical aircraft network was switched off. The left hand forward side area of the belly fairing was covered withhydraulic spray while the equipment, electrical harnesses and

connectors showed signs of high temperature exposure. The leak was coming from the Green EMP FIN 11GE pressure line with insulation damage on one cable of the electrical feeder cables for Green EMP FIN 12GE, in the area of the hydraulic leak. As the leak and cable insulation damage are the only visible evidences, it is supposed that hydraulic spray combined with possible electrical arcing might be the source of the reported damage. Following this event the REF.1 AOT was issued for a one time inspection of the Eaton (formerly Vickers) installation condition. 3.2 CONSEQUENCES Due to the proximity of both the Green EMP hydraulic pressure hose and electrical feeder cables, if damage occurs to the feeder cable with, at the same time, leakage at the hydraulic pressure hose, it might result in the reported event. 3.3 AIM Similarly to REF.1 AOT Rev 01, this AOT is to request, for aircraft equipped with Parker (formerly Abex) Green EMPs,

- Installation of a locally manufactured placard in the cockpit forbidding the in - flight use of the Green EMPs,

- Recording in the logbook of this requirement to not operate the Green EMPs in flight,

- A one - time visual inspection to verify the correct installation and condition (with repair if necessary)of: . The hydraulic pressure hoses (REF.2 or REF.3 IPC f igures), . The electrical conduits, feeder cables (REF.4 IPC figure), . The associated clamping device at Frame 54 as well as the electrical conduits, feeder cables (REF.4 IPC figure) underneath the clamps. This requires removal of the concerned clamps. T his AOT is applicable to all A310 - 200 /
- 300 with Parker (Formerly Abex) EMP models fitted. 4. SHORT TERM ACTION 4.1 PLANNING AND MANPOWER The AOT ́s requirements described in paragraph 4.2 have to be carried out at the next convenient opportunity e.g. du ring a night stop, . Within 15 calendar days from the issue date of the AOT for installation in the cockpit of a locally manufactured placard forbidding the in flight use of the Green EMPs, with recording in the logbook, . Within 500 FH or 4 months whichev er comes first, from the issue date of the AOT for the inspection and repair, if necessary. The estimated manpower for inspection without findings is about 2.00 hours.It is anticipated that this AOT will be rendered mandatory by an EASA

Airworthiness Dir ective (AD). 4.2 AOT ́s REQUIREMENTS a) INSTALLATION IN THE COCKPIT OF A LOCALLY MANUFACTURED SELF - ADHESIVE PLACARD WITH RECORDING IN THE LOGBOOK (1) Install on the "HYD PWR" overhead panel 427VU, a locally manufactured self - adhesive placard forbidding the in - flight use of the Green EMPs (P/BSW FIN 14GE - "ELEC PUMPS"). As a proposal, the placard could be as follows: . With the below wording and letters of about 2 to 3 mm height on a self adhesive placard size of 45 mm width and 10 mm height, DO NOT USE GREEN ELEC PUMPS IN FLIGHT . With placard installed on or above the "ELEC PUMPS" push button switch of "HYD PWR" overhead panel 427VU, (2) Make an entry in the logbook to record, as per above placard, that the in - flight use of the Green EMPs is forbidden. Al so mention that this limitation is applicable until AOT ́s requirement for inspection (and repair, if necessary) is completed as per AOT ́s paragraph 4.2.b). Once AOT ́s requirement is completed (inspection and repair, if necessary), remove the placard from t he cockpit and clear the associated logbook entry. b) INSPECTION / REPAIR / REPLACEMENT (1)Preparation for the inspection / replacement procedure

- Make sure that the aircraft is electrically grounded (AMM 24 - 00 - 00 Page Block 301).

- De - energize the aircraf t electrical circuits (AMM 24 - 41 - 00 Page Block 301).

- Open the LH main landing gear (MLG) door (AMM 32 - 12 - 11 Page Block 301).

- Put the access platform in position in zone 147.

- Depressurize the Green hydraulic system (AMM 29 - 10 - 00 Page Block 301). (2) Ins pection / replacement procedure Perform the following inspection with repair and/or replacement if required:

- Inspect the clamps, the electrical conduits, the feeder cables and hydraulic pressure hoses for correct condition and installation (See REF.2 or REF.3 IPC figures), * Thoroughly check if there is chafing at the upper hydraulic hose, FIN 291576, where it crosses the electrical conduits, * Remove clamps securing the electrical conduits (See REF.4 IPC figure), check condition of the clampin g device as well as of the electrical conduits to ensure there are no damage,

- If damage is found on the electrical conduits, check the condition ofthe

electrical feeder cables,

- If chafing marks or damage beyond allowable limits are apparent replace o r repair the affected parts (Hydraulic pressure hoses, Electrical conduits, feeder cables, clamps). * For permissible damage and defects on hydraulic hose, see REF.5 AMM procedure. * For repair of electrical conduit and feeder cable, see REF.6 and REF.7 ESPM procedures.

- Make sure that the installation is in accordance with REF.2 or REF.3 IPC figures (See below note). Note: For REF.3 IPC figure, please discard the "view B" as there is no clamps and spacer installed. The REF.3 IPC figure will be updated by removing the "view B" and reflect similar installation as per REF.2 IPC figure.

- By orienting the two elbows of the upper hydraulic hose FIN 291576, optimize its clearance with the electrical conduits (See REF.8 AMM procedure). * If the c learance obtained is less than 1 inch (25.4 millimetres) install a spiralex band (Spiral strip) NSA849000T125, as per REF.9 AMM procedure, on the length of the upper hydraulic hose FIN 291576. * Record the lowest clearance between the hose FIN 29 1576 and electrical conduits (LH or RH) or structure, before and after repair or if necessary after re - orientation of the hose ́s elbows. Indicate between which parts (LH or RH electrical conduits or structure) the lowest clearance has been recorded. (3) Test If hydraulic hoses, Green EMP electrical plug(s) and / or electrical feeder cables have been disconnected for repair or replacement, do an operational test of the Green EMPs as per AMM 29 - 21 - 00 Page Block 501. (4) Close - up

- Make sure t hat the work areas are clean and clear of tools and other items.

- Remove the access platform.

- Close the main landing gear (MLG) door LH (AMM 32 - 12 - 11 Page Block 301). 4.3 MATERIAL AND TOOLING For details about the material for both installation configura tions, you can refer to REF.2: IPC 29 - 21 - 03 Figure 1A (Green Parker EMP installation). REF.3: IPC 29 - 21 - 03 Figure 1D (Green Parker EMP installation). REF.4: IPC 24 - 92 - 03 Figure 17 for electrical conduits, feeder cables installation. 5. FURTHER ACTIONAn improvement of the clamping of the electrical conduits and hydraulic

pressure hoses is being reviewed. The solution is expected to be available (Airbus Service Bulletin) by second half of 2012. For your information, as the reported chafing phenomenon is a long term process, with the current AOT ́s inspection requirement enough time will remain for implementation of the forthcoming solution, Airbus Service Bulletin. 6. AOT APPROVAL The technical content of this AOT has been approved under EASA Design Organi zation Approval EASA.21J.031. 7. ACKNOWLEDGEMENT / REPORTING 7.1 ACKNOWLEDGEMENT Operators are requested to acknowledge receipt of this AOT within 48 hours after receipt to: Mlle Laetitia BONNET, SEEL Phone number: +33 (0)5 67 19 24 40 Fax number: +33 (0)5 61 93 32 73 E - mail: Laetitia.bonnet@airbus.com This acknowledgement can be made through the Airbus field service office where available. 7.2 QUESTIONS / REPORTING Questions regarding this AOT and inspection results, with or without findings, are to be sent (See in below note the requested information) to Airbus Customer Services Engineering as soon as possible after the AOT application, to the attention of: Mr. Georges GENIN SEEL4 Phone number: +33 (0)5 61 93 49 29 Fax number: +33 (0)5 61 93 32 73 E - mail: georges.genin@airbus.com Note:

- Aircraft MSN.

- Any previous issues on parts / installation to be inspected by this AOT.

- If any, detailed description of the findings with, if possible, pictures of the affected parts / installation and of the glob al installation view.

- If any, detailed which parts have been repaired or replaced,

- At the upper hydraulic hose FIN 291576 where it crosses the electrical conduits, record the lowest clearance before and after repair or, if necessary, after re - orientation of the hose ́s elbows * Indicate between which parts (LH or RH electrical conduits or structure) the lowest clearance has been recorded.Best regards,

E. VAN AELST VICE PRESIDENT A300 PROGRAMME CUSTOMER SERVICES DIRECTORATE