Fault Message:

RH AFT XFER PUMP ELECT PWR/WRG

Fault Code:

2844627PK

Associated CAS:

AFT XFER FAIL
(Caution)

AFT XFER FAULT
(Advisory)

Right AFT XFER pump failed on or off due to:

• A failure of the Pump command signal from the Fuel Management and Quantity Gauging Computer (FMQGC) or the Fuel Control Panel to the electrical system, OR
• A failure of the Electrical System to power up or down the Pump when commanded, OR
• A failure of the Electrical System to provide Pump power status feedback to the FMQGC

• AC Power Center (ACPC)/Solid-State Power Controller (SSPC) 9 (A16)
• AC Power Center (ACPC) Secondary Logic Card (SLC) AC-4 (A22)
• Right AFT Transfer Pump (B35)
• Fuel Management and Quantity Gauging Computer (FMQGC) (A47)
• Electrical Management System Control-and-Display Unit (EMS CDU) 1 (A94)
• Electrical Management System Control-and-Display Unit (EMS CDU) 2 (A91)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW700-45-0065 - CAIMS Nuisance Fault Messages

Forum Articles/Infoservice/Newsletter: None

1. Using CAIMS, verify if there is fault messages concerning the AC BUS 4 or ACPC are shown:

   1. If YES, troubleshoot them first.
   2. If NO, continue with next step.

2. Select the ACPC A (B) LOAD STATUS LABEL 016, LOAD 1 (AFT TANK R PUMP, Phase A) page, via CAIMS. Set the AFT XFER swith to ON and monitor the results that follow:

   Reference	Status
   LOGIC EQUATION STATE (AFT TANK R PUMP)	ON
   VIRTUAL CIRCUIT BREAKER (SSPC CIRCUIT BREAKER)	IN
   VIRTUAL SWITCH (SSPC SW)	ON
   LOCK STATE	UNLOCKED
   VOLTAGE STATUS	PRESENT
   CURRENT STATUS	FLOWING
   TRIP STATUS (CIRCUIT BREAKER)	NOT TRIP
   FAIL STATUS (SSPC)	NOT FAILED

   1. If the above status are met, go to step 10.
   2. If one of the above status is not met, go to step 4.

   NOTE: Repeat this step by selecting LABEL 016 Load 2 (AFT TANK R PUMP, Phase B) and LABEL 017 Load 1 (AFT TANK R PUMP, Phase C).

3. An alternative way of monitoring the result is to select ACPC IN via EMS CDU1 or CDU2 Signboard Menu:

• Bit 14 or 22:LOGIC EQUATION STATE (AFT TANK L PUMP)
• Bit 15 or 23:VIRTUAL CIRCUIT BREAKER (SSPC CIRCUIT BREAKER)
• Bit 16 or 24:VIRTUAL SWITCH (SSPC SW)
• Bit 17 or 25:LOCK STATE
• Bit 18 or 26:VOLTAGE STATUS
• Bit 19 or 27:CURRENT STATUS
• Bit 20 or 28:TRIP STATUS (CIRCUIT BREAKER)
• Bit 21 or 29:FAIL STATUS (SSPC)

1. If the above status are met, go to step 10.
2. If one of the above status is not met, continue with next step.

   	Left Column								Center Column
   Label 016	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14
   			1	1	1	1	1	1			1	1	1	1	1	1
   Reference	LOAD 2:AFT TANK R PUMP, PHASE B								LOAD 1:AFT TANK R PUMP, PHASE A
   Label 017									21	20	19	18	17	16	15	14
   											1	1	1	1	1	1
   Reference									LOAD 1:AFT TANK R PUMP, PHASE C

4. Perform a wiring check (short to ground=fail) between the ACPC (A54P9) and right aft transfer pump (B35P1).

   1. If wiring checks are not good, repair defective wiring as required and do close out.
   2. If wiring checks are good, continue with next step.

5. Perform a ground check at the right aft transfer pump (B35P1). Repair as required.

   1. If ground is not there, go to step 7.
   2. If ground is there, continue with next step.

6. Swap the right aft transfer pumps.

   1. If system checks are good, replace right aft transfer pump and do close out.
   2. If fault remains, continue with next step.

7. Swap the ACPC/SSPC 7 (A14).

   1. If system checks are good, replace ACPC/SSPC 7 (A14) and do close out.
   2. If fault remains, continue with next step.

8. Swap the ACPC secondary logic card AC-4 (A22).

   1. If system checks are good, replace ACPC secondary logic card AC-4 (A22) and do close out.
   2. If fault remains, continue with next step.

9. Swap the EMS CDUs.

   1. If system checks are good, replace defective EMS CDU and do close out.
   2. If fault remains, continue with next step.

10. Replace FMQGC.
11. Do close out.