SHAKER 1 FAIL
(Advisory)

Left stick shaker fault (low or over current) is reported by the Stall Protection Computer (SPC) during the continuous BIT or by the pilot activated test, and annunciate by both SPC channels.

• Shaker 1
• Stall Protection Computer (SPC)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW700-27-0275 - Stall Protection Computer Nuisance fault
• AW700-27-0363 - Stall Protection Computer NFF

Forum Articles/Infoservice/Newsletter: None

Refer to Dispatch Issue for Recommended Action prior to troubleshooting.

The loss of the SPC channel A will result in the following CAS message:

• STALL PROTECT FAIL
• ADC 2-3 DEGRADED
• SHAKER 1 FAIL

If you have these CAS messages perform the troubleshooting for the STALL PROTECT FAIL CAS message.
Make sure the aircraft is in the Weight-On-Wheels (WOW) condition, the airspeed (CAS) is less than 50 knots and the autopilot is not engaged for the CAIMS Maintenance mode.

1. Access CAIMS to view stored or active faults. Select displayed message from menu below:
   - Select message -2730206STL - SHAKER #1/WRG/SPC CH A

   1. If no messages are displayed, continue with next step.

2. Make sure connector (A203) and the wires connected on stick shaker 1 are not damaged.

   1. If defects are found, repair defective as required and do close out.
   2. If no defects are found, continue with next step.

3. Perform a continuity to ground check at the Stick Shaker 1 A203P1 Pin B.

   1. If there is continuity, continue with next step.
   2. If there is no continuity, repair defective wiring as required and do close out.

4. Remove the Stall Protection Computer; inspect the tray, connector and the pins at the connector tray.

   1. If defects are found, rectify as required.
   2. If no defects are found, continue with next step.

5. Perform a 28 VDC voltage check at the SPC input (A40AP1-1) from SPDA 1.

   1. If 28 VDC is present, continue with next step.
   2. If 28 VDC is not present, perform a wiring check between the SPC and SPDA 1 and repair as required.

6. Re-install the SPC.

   1. If system checks are good, do close out.
   2. If fault remains, continue with next step.
      NOTE: The SPC is difficult to install due to it's location.

7. Swap SPDA 1 with SPDA 3. Is the fault still present?

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

8. Replace Stick Shaker 1.
   NOTE: If possible, swap stick shaker 1 and 2 and confirm that the fault follows the shaker to the other side.
9. Do close out.