Fault Message:

RH AFT AC BOOST PUMP ELECT PWR/WRG

Fault Code:

2844609PK

Associated CAS:

R PRI FUEL PUMPS
(Caution)

R PRI FUEL PUMP
(Advisory)

R AFT AC BOOST PUMP LMS/WRG FAULT shows when the conditions that follow occur:

1. The R WING FEED INHIBIT PRI PUMP Switch on the Fuel Control Panel is not set to OFF.
2. The Right Engine is on, the Right Engine is on with the Cross-Feed Valve open, or the Auxiliary Power Unit (APU) is on.
3. The Right Aft Boost-Pump pressure is low.
4. The aircraft has a pitch angle of more than -1 degree.
5. The Electrical Management System (EMS)/AC Power Center (ACPC) has a failure.

OR

1. The R WING FEED INHIBIT PRI PUMP Switch on the Fuel Control Panel is set to OFF.
2. The Right Engine and the APU are off and the Left Engine is not on with the Cross-Feed Valve open.
3. The Right Aft Boost-Pump Pressure is high.
4. The EMS/ACPC has a failure.

• AC Power Center (ACPC)/Solid-State Power Controller (SSPC) 10
• AC Power Center (ACPC) Secondary Logic Card (SLC)
• Right AFT AC Boost Pump Catridge (B23)
• Fuel Management Quantity and Gauging Computer (FMQGC) (A47)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW700-45-0065 - CAIMS Nuisance Fault Messages

Forum Articles/Infoservice/Newsletter: None

1. Select the ACPC A (B) LOAD STATUS LABEL 017, LOAD 2 (R AFT PRI PUMP, Phase A) page, via CAIMS on the PMAT. Set the right ENGINE RUN swith to ON and the R PRIM PUMPS switch/light to ON (Pushed out). Make sure the result that follows are met:

   Reference	Status
   LOGIC EQUATION STATE (L TRANSFER REQUEST)	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 8.
   2. If one of the above status is not met, go to step 3.
   3. If more than one status is not met, continue with next step.
      NOTE: Repeat this step by selecting LABEL 020 Load 1 (R AFT PRI PUMP, Phase B) and LABEL 020 Load 2 (R AFT PRI PUMP, Phase C).

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

   	Left Column								Center Column
   Label 017	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14
   			1	1	1	1	1	1
   Reference	R AFT PRIM PUMP Phase A
   Label 020	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
   	R AFT PRIM PUMP Phase C								R AFT PRIM PUMP Phase B

   • Bit 14 or 22:LOGIC EQUATION STATE (L TRANSFER REQUEST)
   • 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 8.
   2. If one of the above status is not met, continue with next step.

3. Perform wiring check (short to ground=fail) between the ACPC (A54P1) and right wing aft AC boost-pump (B23P1).

   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.

4. Perform a ground check at left wing aft AC boost-pump (B23J1). Repair as required.

   1. If ground is not there, go to step 6.
   2. If ground is there, continue with next step.

5. Swap the Right Wing AC boost-pump with Left Wing AC boost pump. Is the fault still present?

   1. If NO, replace Right Wing AC boost-pump and do close out.
   2. If YES, continue with next step.

6. Swap the ACPC/SSPC 10. Is the fault still present?

   1. If NO, replace ACPC/SSPC 10 and do close out.
   2. If YES, continue with next step.

7. Swap the ACPC secondary logic card. Is the fault still present?

   1. If NO, replace defective ACPC secondary logic card card and do close out.
   2. If YES, continue with next step.

8. Remove the FMQGC. Re-install the FMQGC making sure it is fully and properly inserted into place. Is the fault still present?

   1. If NO, do close out.
   2. If YES, continue with next step.

9. Replace the FMQGC.
10. Do close out.