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HS-ACE
Horizontal stabiliser actuator control electronics
Controls the horizontal stabiliser through the HSA. Limits manual trim commands to 3s, and provides airspeed augmentation. Dual channel with the channels in active and standby modes. The FCM alternates channels each day. Channel 1 is powered by DC Main Bus 1, and channel 2 is powered by DC ESS Bus 2.
Trim commands have the following priority:
- backup trim command
- pilot trim command
- copilot trim command
- FCM trim command
Pushing the trim disconnect switch on the control column disables both HS-ACE channels. The pitch trim cutout switches disable the respective HS-ACE channel. After a stick shaker signal, the HS-ACE will not respond to pitch up commands.