Message Name:

PUSHER FAIL/NO POWER

Message Code:

B3-007988

Associated CAS:

STALL PROTECT FAIL
(Caution)

The Stall Protection Computer is reporting a failure with the Stick Pusher Actuator.

• Stick Pusher Actuator (SPA) (A181)
• Stall Protection Computer (SPC) (A178)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW300-27-0105 - "STALL PROTECT FAIL" Nuisance CAS Message (20501 to 20999)
• SB100-27-14 - Modification - Stall Protection System - Introduction of the Stall Protection Computer (SPC) Part No. 822-1792-003 to Correct Loopback ARINC 429 Failure Messages (20501 - 20999)

Forum Articles/Infoservice/Newsletter: None

1. 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.

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

   STALL L PWR	CB1-B10
   STALL R PWR	CB2-B10
   STALL PUSHER	CB1-B12

2. Ensure power and ground return are available at Stick Pusher Actuator.

   1. If 28 VDC and ground return are available at Stick Pusher Actuator connector A181P1, go to step 4.
   2. If 28 VDC and ground return are not available at Stick Pusher Actuator connector A181P1, continue with next step.

3. Do wiring check between Stick Pusher Actuator connector A181P1, STALL PUSHER PBA and circuit breaker CB1-B12 STALL PUSHER. Repair/replace as required.

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

4. Ensure 'Stick Pusher' power and ground return are available at SPC.

   1. If 28 VDC and ground return are available at SPC connector A178P1, go to step 6.
   2. If 28 VDC and ground return are not available at SPC connector A178P1, continue with next step.

5. Do wiring check between SPC connectors A178AP1 and circuit breaker CB1-B12 STALL PUSHER. Repair/replace as required.

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

6. Do wiring check of the ARINC between SPC connectors A178AP1 / A178BP1 and Stick Pusher Actuator connector A181P1. Repair/replace as required.

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

7. Replace Stick Pusher Actuator.

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

8. Replace SPC.
9. Do close out.