Message Name:

RH DC AUX PUMP/PRESS SW/WRG

Message Code:

2844614PK

Associated CAS:

-> FUEL XFER FAIL
(Caution)

-> FUEL XFER ON
(Caution)

R AUX FUEL PUMP
(Advisory)

R DC AUX PUMP/WRG FAULT shows when the Conditions that follow occur:

• The Right AUX Pump command is on
• The Right AUX Pump Pressure-Indication is low

  OR,

• The Right AUX Pump command is off
• The Right AUX Pump Pressure-Indication is high

NOTE: If both of the CAIMS messages R DC AUX PUMP/PRES SWITCH FAULT and R DC AUX PUMP LMS/WIRING FAULT show, troubleshoot with R DC AUX PUMP LMS/WIRING FAULT page first.

• Right DC Auxiliary-Pump Cartridge (B24)
• Right DC Auxiliary-Pump Pressure-Switch (S17)
• FUEL Control Panel (AP5)
• Throttle Quadrant (TQ) (AP41)
• Right FWD AC Boost Pump Pressure Switch (S15)
• Right AFT AC Boost Pump Pressure Switch (S16)
• Fuel Management and Quantity Gauging Computer (FMQGC) (A47)
• Electrical Management System Control and Display Units (EMS CDU) 1 (A94)
• Electrical Management System Control and Display Units (EMS CDU) 2 (A91)
• Secondary Power Distribution Assemblies (SPDA) 3 (A15)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW700-45-0065 - CAIMS Nuisance Fault Messages

Forum Articles/Infoservice/Newsletter: None

1. Check for 28 VDC at the right wing DC auxiliary pump (B24P1).

   1. If voltage is not there, go to step 7.
   2. If voltage is there, continue with next step.
      NOTE: To turn on the pump, the right ENGINE RUN switch must be set to ON, R AUX PUMPS switch/light set to ON (Pushed out), and R PRIM PUMPS switch/light to OFF (Pushed in).

2. Perform wiring check (Open to ground = fail) between the right wing DC auxiliary pump (B24P1) and ground stud (GS314) (GS322).

   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.

3. Replace the right wing DC auxiliary pump cartridge.

   1. If system checks are good, do close out.
   2. If fault remains, continue with next step.

4. Interchange the Right DC auxiliary pump with Left DC auxiliary pump.

   1. If system checks are good, replace Right DC auxiliary pump and do close out.
   2. If fault remains, continue with next step.

5. Perform wiring check between right wing DC auxiliary-pump pressure-switch (S17P1), ground stud (GS311), and FMQGC (A47DP1).

   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.

6. Interchange the Right wing DC auxiliary pump pressure switch (S17) with Left wing DC auxiliary pump pressure switch (S11).

   1. If system checks are good, replace Right wing DC auxiliary pump pressure switch and do close out.
   2. If fault remains, go to step 18.
      NOTE: It is possible to use one of the right wing AC boost-pump pressure-switch.

7. Perform wiring check between the SPDA 3 (A15P1) and right wing DC auxiliary pump (B24P1).

   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.

8. Operate the right wing DC auxiliary pump (B24) and monitor the result by selecting SPDA 3 IN via EMS CDU1 (CDU2) signboard Menu:

   	Left Column								Center Column
   Label 300	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14
   								X	X	X	X
   Reference	Right DC Aux Pump Status								Right DC Aux Pump Status

   1. If the manual operation of the right DC auxiliary pump agree with the pump status, go to step 18.
   2. If 1XX0 = SSPC Fail (Can't turn On) (Can't turn Off) is shown, go to step 16.
   3. If X1XX (On (V&I) < 20%) is shown when pump is manually commanded ON, continue with next step.
   4. If 0011 = On (V&I) > 20% is shown when pump is manually commanded OFF, continue with next step.
   5. If 0000 (L AUX PUMP OFF) is shown when pump is manually commanded ON, continue with next step.

9. Perform wiring check between EMS CDU 1 (A94P2), FUEL control panel (AP5P2), right aft boost pump pressure switch (S16P1), TQA (AP41P3) and ground module (GM9).

   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.
      NOTE: When the R ENG RUN switch is set to ON and the R PRIM PUMPS switch/light is set to OFF, a ground is sent to EMS CDU 1 (A94P2).

10. Perform wiring check between EMS CDU 2 (A91P2), FUEL control panel (AP5P2), right forward boost pump pressure switch (S15P1), TQA (AP41P3) and ground module (GM9).

    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.
       NOTE: When the R ENG RUN switch is set to ON and the R PRIM PUMPS switch/light is set to OFF, a ground is sent to EMS CDU 2 (A91P2).

11. Interchange the R AUX PUMP switch/light (SDS5) with Left AUX PUMP switch/light (SDS1).

    1. If system checks are good, replace R AUX PUMP switch/light and do close out.
    2. If fault remains, continue with next step.

12. Interchange the Right aft boost pump pressure switch (S16) with Left aft boost pump pressure switch (S10).

    1. If system checks are good, replace Right aft boost pump pressure switch and do close out.
    2. If fault remains, continue with next step.

13. Interchange the Right forward boost pump pressure switch (S15) with Left forward boost pump pressure switch (S9).

    1. If system checks are good, replace Right forward boost pump pressure switch and do close out.
    2. If fault remains, continue with next step.

14. Replace the FUEL control panel (AP5).

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

15. Replace the TQA (AP41).

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

16. Interchange the EMS CDU 2 with EMS CDU 1.

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

17. Interchange the SPDA 3 (A15) with SPDA 2 (A14).

    1. If system checks are good, replace SPDA 3 and do close out.
    2. If fault remains, continue with next step.

18. Select the FMQGC A (B)-CH A (B) DC (FEED) PUMPS TEST page, via the OMS. Follow the instruction to operate the right DC (FEED) pump, make sure the results that follow are met:

    Operation	Pump On	Pump OFF
    RIGHT DC PUMP COMMAND CHOICE	TURN ON	TURN OFF
    RIGHT DC PUMP PRESSURE	Not low	Low

    1. If all the above right wing DC auxiliary pump operations are met or if FMQGC channels are in disagreement, go to step 20.
    2. If the RIGHT DC PUMP COMMAND CHOICE status disagree with the pump operation, continue with the next step.

19. Perform wiring check between FUEL control panel (AP5P2), and FMQGC (A47DP1).

    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.

20. Replace the FMQGC computer.
21. Do close out.