L PRI FUEL PUMPS
(Caution)

Both forward & aft PRI (AC) pumps on the left side have failed.

• AC Power Center (ACPC) Solid State Power Controller (SSPC) 1
• ACPC SSPC 6
• Throttle Quadrant Assembly (TQA) (AP41)
• L Engine RUN Switch (1S1)
• Fuel Management Quantity and Gauging Computer (FMQGC) (A47)
• Left Fwd AC Boost Pump (B6)
• Left Aft AC Boost Pump (B7)
• Left Fwd AC Boost Pump Pressure Switch (S9)
• Left Aft AC Boost Pump Pressure Switch (S10)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW700-28-0368 - No Fault Found initiative: Fuel Management and Quantity Gauging Computer (FMQGC)
• AW700-28-0469 - Fuel Management and Quantity Gauging Computer Tray Connector Inspection

Forum Articles/Infoservice/Newsletter: None

NOTE: If the Left Primary AC pumps and the Left DC Aux pumps are showing inoperative after engine shutdown, go to Troubleshooting Recommendations step 2.

1. Access CAIMS Active Faults and select displayed message from menu below:
   Select an Item2844605PK - LH AFT AC BOOST PUMP/PRESS SW/WRG2844606PK - LH AFT AC BOOST PUMP ELECT PWR/WRG2844607PK - LH AFT AC BOOST PUMP PRESS SW/WRG284460BPK - LH FWD AC BOOST PUMP/PRESS SW/WRG284460CPK - LH FWD AC BOOST PUMP ELECT PWR/WRG284460DPK - LH FWD AC BOOST PUMP PRESS SW/WRG
2. If the left primary AC pumps and the left DC aux pumps are showing inoperative after engine shutdown, continue with next step
3. With the LH FUEL CUTOFF switch in the OFF position, check for continuity to ground between FMQGC connector A47AP1 pin H12 and ground.

   1. If there is no continuity, continue with next step
   2. If there is continuity, go to step 7

4. On the TQA, check for continuity of the LH FUEL CUTOFF switch (1S1) between connector A41J2 pins 38 and 46.

   1. If there is continuity, continue with next step
   2. If there is no continuity, replace the TQA

5. Check for continuity between connector A41P2 pin 38 and airframe ground.

   1. If there is no continuity, check the ground stud or repair defective wiring as required
   2. If there is continuity, continue with next step

6. Perform wiring checks between the FMQGC and the left Engine Fuel Cutoff switch and repair as required
7. Remove the FMQGC and rerack the unit fully and perform a test of the system. Is the fault still present?

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

8. Access the ACPC logic assembly. Swap SSPC 6 (L FWD PRI PUMP) with SSPC 4 (spare card). Is the fault still present?

   1. If YES, continue with next step.
   2. If NO, replace defective SSPC card.

9. Swap SSPC 1 (L AFT PRI PUMP) with SSPC 4 (spare card). Is the fault still present?

   1. If YES, continue with next step.
   2. If NO, replace defective SSPC card.

10. Contact the Bombardier Customer Response Center for further troubleshooting.
11. Do close out.