Airbus All Operators Transmission A28L006-17

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: A28L006-17 Rev 00 Page 1 of 7 Date: 03-NOV-2017 © AIRBUS S.A.S. 2017. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT SUBJECT: ATA 28 – Fuel Pump Cavitation Erosion AIRCRAFT TYPE: A330,A340 OUR REF.: A28L006-17 Rev 00 dated 03-NOV-2017

1. AIRCRAFT AFFECTED ALL A330, A340 Aircraft models

2. REFERENCED DOCUMENTATION FOT ref. 999.0094/17

2.1 APPENDIX Flowchart_AOT.pdf

2.2 REFERENCES Aircraft Maintenance Manual:

Center Tank Pumps:

Ref.1: AMM 28-26-51-000-802-A “Removal of the Fuel Pump Element” Ref.2: AMM 28-26-51-400-802-A “Installation of the Fuel Pump element” Rear Center Tank Pumps:

Ref.3: AMM 28-26-56-000-801-A “Removal of the RCT Fuel-Transfer Pump Element” Ref.4: AMM 28-26-56-400-801-A “Installation of the RCT Fuel-Transfer Pump Element” Stand-By Pumps:

Ref.5: AMM 28-21-51-000-802-A “Removal of the fuel Pump Element” Ref.6: AMM 28-21-51-400-802-A “Installation of the Fuel Pump element” Aft Transfer Pumps:

Ref.7: AMM 28-27-58-000-801-A “Removal of the Center-Tank Fuel-Transfer Pump Element” Ref.8: AMM 28-27-58-400-801-A “Installation of the Center-Tank Fuel-Transfer Pump Element” Ref.9: AMM 28-27-59-000-801-A “Removal of the Fuel-Transfer Pump Element” Ref.10: AMM 28-27-59-400-801-A “Installation of the Fuel-Transfer Pump Element” Master Minimum Equipment List:

A330:

MMEL 28-21-01 MMEL 28-26-02 A340-200/-300:

MMEL 28-21-01 MMEL 28-21-02 MMEL 28-26-02 A340-500/-600:

MMEL 28-21-01 MMEL 28-21-02 MMEL 28-26-02 MMEL 28-26-08

ALERT OPERATORS TRANSMISSION - AOT AOT ref: A28L006-17 Rev 00 Page 2 of 7 Date: 03-NOV-2017 © AIRBUS S.A.S. 2017. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT MMEL 28-27-06 MMEL 28-27-07

3. REASON The purpose of this AOT is to inform A330/A340 operators of fuel pump cavitation erosion that may lead to a break-through and to explain the need to perform an inspection on fuel pumps located at certain positions on the aircraft.

3.1 FACTS A pump was removed from an aircraft due to an independent failure. When returned to Eaton, cavitation erosion was observed to have breached the fuel pump housing through the inlet webs and exposed the fuel pump power supply wires.

Evaluation of previously removed pumps showed that some of these had also experienced similar erosion in varying degrees. However, no other instance of break-through due to cavitation erosion was found.

Due to design similarities, PN 568-1-28300-101, 568-1-28300-103 and 568-1-28300-200 only are considered affected.

3.2 CONSEQUENCES The above scenario potentially exposes fuel to an ignition source which is considered as unsafe.

3.3 AIM The aim of this AOT is to inform operators of the need to perform inspections on fuel pumps PN 568-1- 28300-101, 568-1-28300-103 and 568-1-28300-200 that have accumulated more than 10000FH on the following positions:

CTR Tank (600QL1,600QL2) Rear CTR Tank (608QL1, 608QL2) Standby pumps (112QA1, 112QA2) Aft transfer pump (712QN1,712QN2 & 711QN1,711QN2, 711QN3, 711QN4) A330-200 X (except A330-200F) X A330-300 X (when equipped with wet center tank MOD 204025) X A340-200 X A340-300 X A340-500 X X X A340-600 X X

4. SHORT TERM ACTION

ALERT OPERATORS TRANSMISSION - AOT AOT ref: A28L006-17 Rev 00 Page 3 of 7 Date: 03-NOV-2017 © AIRBUS S.A.S. 2017. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT

4.1 PLANNING AND MANPOWER

4.1.1 ACCOMPLISHMENT TIMESCALE Inspect fuel pumps above 10000FH since new or last Vendor visit, and inspect pumps prior to any installation, within the following timeframe based on the location:

A330-200/-300 (when equipped with wet center tank MOD 204025):

oCenter Tank Pumps (except for A330-200F) should be inspected within 20 days.

oStand-by pumps should be inspected within 40 days.

A340-200/-300:

oCenter Tank Pumps should be inspected within 20 days.

A340-500:

oCenter Tank and Rear Center Tank Pumps should be inspected within 20 days.

oAft Transfer Pumps should be inspected within 20 days.

A340-600:

oCenter Tank Pumps should be inspected within 20 days.

oAft Transfer Pumps should be inspected within 20 days.

Note: For Center Tank pumps , Rear Center Tank pumps and Aft Transfer pumps, deactivation of the pumps by pulling and tagging the related circuit breaker and application of the corresponding MMEL Item can be considered to postpone the inspection and/or the replacement of the pump in case of severe erosion (case 3 below) for the MMEL Item validity duration (refer to paragraph 5.2 for details).

4.1.2 MANPOWER The estimated time to perform the removal, inspection and re-installation of the fuel pump is 1 man-hour per pump.

4.2 DESCRIPTION

4.2.1 ACCESS Please refer to ACCESS information listed in the related AMM Task (from Ref. 1 to 10)

4.2.2 INSPECTION REQUIREMENTS The inspection can be carried out visually to evaluate the severity of the erosion if any (refer to paragraph 4.2.3 FINDINGS for the different actions to be performed).

ALERT OPERATORS TRANSMISSION - AOT AOT ref: A28L006-17 Rev 00 Page 4 of 7 Date: 03-NOV-2017 © AIRBUS S.A.S. 2017. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT The following procedure should be performed for each applicable pump within the timeframe defined in paragraph 4.1.1 ACCOMPLISHMENT TIMESCALE:

1. Remove the pump from the A/C by applying the corresponding AMM Task (Ref. 1, 3, 5, 7 or

9).

2. Perform a detailed visual inspection of the vane of the pump at the location indicated on below figures:

Figure 1 – Position of the web

3. Record and report upon inspection of each aircraft the following information for traceability:

a. Photograph of the inspected area

b. Unit Serial Number

c. Aircraft Registration Number

d. Number of Flight Hours of the Unit

e. Number of Flight Cycles of the Unit

f. Unit FIN number

g. Level of findings (ref. paragraph 4.2.3 FINDINGS)

4. Refer to Paragraph 4.2.3 FINDINGS.

ALERT OPERATORS TRANSMISSION - AOT AOT ref: A28L006-17 Rev 00 Page 5 of 7 Date: 03-NOV-2017 © AIRBUS S.A.S. 2017. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT

4.2.3 FINDINGS The three below criteria are to be compared with the findings found on the pump to decide which action should be applied to close the inspection:

Case 1: Light Erosion (blemishing):

Surface blemishing with grey anodise treatment removed from web Base material has begun to erode with light blemishing without pitting or cavity.

Case 2: Medium Erosion (pitting):

An extensive surface blemishing with grey anodise treatment removed from web Base material has eroded with pitting or single or multiple shallow cavities Case 3: Severe Erosion (breakthrough):

Base material is heavily eroded with pitting and single or multiple deep cavities leading to break through the material In case of:

No findings or Light erosion findings (blemishing): the pump is acceptable for flight but must be inspected again every 5000FH provided that the level of erosion remains light or non-existent as defined above.

Medium erosion findings (pitting): the pump is acceptable for flight but must be inspected again every 800FH provided that the level of erosion remains medium as defined above.

Severe erosion findings (breakthrough): the pump is not acceptable for flight and must be replaced immediately. For Center tank, Rear Center tank and Aft transfer Pump, it is possible to deactivate the pump. Refer to Paragraph 5.2 for more details.

ALERT OPERATORS TRANSMISSION - AOT AOT ref: A28L006-17 Rev 00 Page 6 of 7 Date: 03-NOV-2017 © AIRBUS S.A.S. 2017. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT

4.3 SPARES AND TOOLING Retrofit policy and complementary details will be provided in RIL Ref.LR28M17010273.

5. FURTHER INFORMATION

5.1 FOLLOW-UP PLAN It is anticipated that this AOT will be mandated by an AD. An ISB may follow to supersede or cancel this AOT.

5.2 IMPACTED DOCUMENTATION The present AOT is impacting the MMEL documentation and will be followed up by a MMEL “major event change” and a FOT to cover all the changes.

The following changes in the MMEL are to be followed:

For A330:

MMEL Items 28-21-01 become No-Go Items.

When applicable, MMEL Items 28-26-02 can be applied provided that the related circuit breaker is pulled and tagged for the duration of the MMEL Item .

For A340-200/-300:

MMEL Items 28-21-01, 28-21-02 become No-Go Items.

MMEL Items 28-26-02 can be applied provided that the related circuit breaker is pulled and tagged for the duration of the MMEL Item.

For A340-500:

MMEL Items 28-21-01 and 28-21-02 become No-Go Items.

MMEL Items 28-26-02 can be applied provided that the related circuit breaker is pulled and tagged for the duration of the MMEL Item.

MMEL Item 28-26-07 can be applied provided that the related circuit breaker is pulled and tagged for the duration of the MMEL Item.

For A340-600:

MMEL Items 28-21-01 and 28-21-02 become No-Go Items.

MMEL Items 28-26-02 can be applied provided that the related circuit breaker is pulled and tagged for the duration of the MMEL Item.

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

7. REPORTING Retrofit will be performed through the monitored retrofit described in RIL Ref. LR28M17010273 Questions about this AOT are to be addressed to Airbus Customer Services through TechRequest on Airbus World, selecting Engineering Domain, Engineering Support Section and ATA 28-21 or 28-26.

ALERT OPERATORS TRANSMISSION - AOT AOT ref: A28L006-17 Rev 00 Page 7 of 7 Date: 03-NOV-2017 © AIRBUS S.A.S. 2017. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT As per latest reporting policy (Ref to OIT 999.0018/16), inspection results (with or without findings) including the list of information detailed in Paragraph 4.2.2 are to be addressed to Airbus Customer Services - upon inspection of each aircraft - through the generic e-mail address:

inspection.results@airbus.com copy monitored.retrofit@airbus.com.

Best Regards, Jean-Luc MOUYSSET

VICE PRESIDENT ENGINEERING SUPPORT

CUSTOMER SERVICES Guillaume PELEGRINO VICE PRESIDENT A330-A340 PROGRAMME

CUSTOMER SERVICES

Start 1s the pump life above No 10000FH or is the pump being → No further action relocated Inspect the pump in accordance with paragraph

4.2.2 instructions erosion: blemishing Case 1: No findings or Light level of Assess the level of Case 3: Severe level of erosion: breakthrough erosion in accordance with paragraph 4.2.3 Case 2: Medium level of erosion: pitting The pump is acceptable for flight and need to be reinspected after 5000FH The pump is acceptable for flight and need to be reinspected after 800FH The pump is not acceptable for flight and need to be replaced or temporarily deactivated End