Message Name:

NO R FLAP ANALOG TO SPC

Message Code:

B3-007959

Associated CAS:

None

The right flap position analog input is invalid. Verify the R FPIU and aircraft wiring.

• Flap Position Sensor (RH) (MPE78)
• Flap Control Unit (FCU) (A124)
• Stall Protection Computer (SPC) (A178)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW300-27-0058 - "STALL PROTECT FAIL" Nuisance CAS Message

Forum Articles/Infoservice/Newsletter: None

Should the MDC CURRENT FAULTS and/or FAULT HISTORY exhibit bit 13 and/or bit 16 set on the Label 352 under the FCU, the following steps should be performed on the ground in order to clear the messages:

1. Cycle power using circuit breakers CB1-B13 Flap L IND, CB1-B14 Flap CTRL and CB2-B12 Flap R IND CTRL.
2. Reset the FCU by pressing the FCU reset button ref. AMM ATA 27-52-00.

NOTE: A power cycling is necessary before pushing the reset button. The power cycling will reactivate the FCU and clear the CAS messages and associated MDC Faults.

1. Do the electrical rigging of the flap system.

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

2. In the MAINTENANCE MAIN MENU, select LRU RIGGING / FLAP CTRL UNIT / RIGGING / POSITION SENSORS.

   NOTE: Flap Position Indication Unit is a dual resolver type. The signal triggering the CAS message is not the same that gives flap position on the flight control synoptic page.

   1. If four Flap Position Sensors are shown with corresponding values (no dashes), go to step 5.
   2. If a Flap Position Sensor show magenta dashes, continue with next step.

3. Check corresponding Flap Position Sensor.

   NOTE: All pins should ring open to the case or ground. In-flight failures may be due to moisture and freezing, pack the sensor in ice/dry-ice to simulate faults in flight, then recheck the resistance.

   RH Channel A			RH Channel B
   A124AP1	MPE78P2	Value	A124BP1	MPE77P2	Value
   14K,15K	1, 2	104Ω to 124Ω	9F, 9E	1, 2	104Ω to 124Ω
   14H, 15H	3, 4	73.8Ω to 90.2Ω	11F, 11E	3, 4	73.8Ω to 90.2Ω
   14J, 15J	5, 6	73.8Ω to 90.2Ω	10F, 10E	5, 6	73.8Ω to 90.2Ω

   1. If R FPIU resistance is out of tolerance, go to step.6.
   2. If R FPIU resistance within tolerance, continue with next step.

4. Do wiring checks between R FPIU and FCU.

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

5. Reset circuit breakers CB2-B12 FLAP R IND/CTRL, CB1-B14 FLAP CTRL and CB1-B13 FLAP L IND.

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

6. Re-rack FCU.

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

7. Replace FCU.

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

8. Reset the following circuit breakers and perform the Pilot Activated Test (PAT) of the Stall Protection System on the Systems Test control-panel located on the center pedestal.

   STALL L PWR	CB1-B10
   STALL R PWR	CB2-B10

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

9. Re-rack SPC.

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

10. Do wiring checks between FCU and SPC. Repair as require.

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

11. Replace SPC.
12. Do close out.