AOL 295-025

Services REV: 01 PAGE: 1 OF 5

Engineering Support DATE: August 1st, 2013

ALL OPERATOR LETTER

This AOL intention is to advise Operators of matters, which might involve safety issues.

Operators may consider, under their own criteria, the actions to be taken.

SUBJECT: BOOSTER PUMP WIRING – DAMAGE

0. REASON FOR REVISION

This AOL has been revised in order to add P/N 1C12-46 (interchangeable with P/N 1C12-34) to 

current inspection recommendation.

1. BACKGROUND

The C-295 aircraft is fitted with two booster pumps located inside each side of the center wing and 

accessible from the outside of the wing lower skin (see Figure 1). The booster pump main functions 

are to provide the main flow to the jet pumps for feed and transfer operations, to provide the 

additional feed pressure in the crossfeed operations and to provide the fuel to the engines in case of 

failure of the jet pump.

The C-295 aircraft is equipped with booster pumps P/N 1C12-34 and 1C12-46 (Parker).

Airbus Military has been recently informed about an in service event involving one fuel booster pump 

P/N 1C12-34 fitted in a CN-235. According to the information received, and further to a problem 

reported in flight regarding fuel transfer system, the inspection of one booster pump revealed 

damages on the electrical feeding cable and some burn marks on the pump body and plate (fairing) 

at the external side of the fuel tank (see figure 2).

No other similar event has been reported so far to Airbus Military.

2. PURPOSE

This AOL is issued to inform all C-295 operators of this event and provide recommendations to 

perform inspections on those C-295 aircraft fitted with booster pumps P/N 1C12-34 or 1C12-46.

3. RECOMMENDATION

The following recommendations are aimed to gather in-service aircraft current status of the subject 

booster pump feeding cable in support of the investigation of this event that is being performed by 

Airbus Military in close cooperation with the booster pump manufacturer.
AOL 295-025

Services REV: 01 PAGE: 2 OF 5

Engineering Support DATE: August 1st, 2013

SUBJECT: BOOSTER PUMP WIRING – DAMAGE

Airbus Military recommends to perform a visual inspection of the booster pumps P/N 1C12-34 or 

1C12-46 feeding cables following the procedure described below and in accordance with the 

following timeframe:

For aircraft accumulating at the time of reception of this AOL 300FH or more since last booster 

pump replacement; perform the inspection of the subject pump before 5 FC after reception of 

this AOL.

For aircraft accumulating at the time of reception of this AOL less than 300FH since last booster 

pump replacement; perform the inspection of the subject pump at next “A” check. 

3.1. Inspection (Refer to Figure 1)

Preparation for the inspection

- Put warning notices in the correct position to prevent the electrical power supply to the aircraft.

- Put the servicing platform in the correct position.

- Refer to AMM 28-22-51-00A-920A-A (BOOSTER PUMP QB37(QB36) - Removal/Installation) for 

removal procedure and perform points 2.2, 2.3, 2.4, 2.5 and 2.6 to get access to the booster 

pump feeder cable.

Inspection

- Do a visual inspection of the booster pump feeder cable for:

- General condition

- Correct fastening and restraints

- Bonding jumpers correctly installed

- Signs of overheating

- Marks for rubbing or electrical arcing

- Connections in bad condition and legibility of signs

In case of any findings or fuel leaks are detected, report to Airbus Military and replace the booster 

pump before further flight; or within 10 consecutive calendar days, if the following conditions are 

accomplished:

- The affected booster pump must not be used.

- A label “INOP” is placed in corresponding PUMPS button located in Fuel System panel.

- The remaining booster pump must be operative

- The associated engine feed ejector pump operates normally

- The crossfeed valve operates normally

- The associated low fuel pressure warning system operates normally
AOL 295-025

Services REV: 01 PAGE: 3 OF 5

Engineering Support DATE: August 1st, 2013

SUBJECT: BOOSTER PUMP WIRING – DAMAGE

- Both fuel quantity indications operate normally

- The associated low fuel level annunciator operates normally

- The associated auxiliary transfer ejector pump operates normally

Close up

Refer to AMM 28-22-51-00A-920A-A (BOOSTER PUMP QB37(QB36) - Removal/Installation)

and perform points 5.4, 5.5, 5.6, 5.8, 5.9 and 5.10.

Remove the service platforms

Remove warning notices

Reporting

Please, report inspections results to Airbus Military indicating:

Aircraft MSN, Flight Hours and Flight Cycles

Booster Pump Flight Hours since new and since last restoration

Booster Pump Part Number and Serial Number

Description of findings (or no findings) including pictures.

4. FOLLOW UP

Based on operators collected data, Airbus Military in collaboration with Parker will perform an 

investigation about damage root cause and will provide further recommendations if needed.

For any doubt associated to this All Operator Letter, please contact:

AIRBUS MILITARY

Services / Engineering Support

e-mail: MTA.TechnicalService@military.airbus.com

Fax: +34 91 585 3127

For US operators, additionally contact:

e-mail: TechnicalSupport@airbusmilitaryna.com

Félix Delgado Martínez

HO Engineering Support

Airbus Military / EADS-CASA
AOL 295-025

Services REV: 01 PAGE: 4 OF 5

Engineering Support DATE: August 1st, 2013

SUBJECT: BOOSTER PUMP WIRING – DAMAGE

Figure 1
AOL 295-025

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Engineering Support DATE: August 1st, 2013

SUBJECT: BOOSTER PUMP WIRING – DAMAGE

Figure 2 (Potential Damage).