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FOR SIMULATION USE ONLY ā NOT A TRAINING AID
TRIM AID DEVICE (TAD)
Figure 1-19 Trim Aid Device (TAD) Switch Location
The rudder trim aid device (TAD) assists directional (yaw) trimming during airspeed
and power changes. The TAD senses engine torque, altitude, airspeed, and pitch
rate, and computes a desired rudder trim tab position.
The computed signal is applied to the rudder trim tab actuator, which deflects the
trim tab to the computed position, resulting in lower out-of-trim forces.
The trim aid device is selected by a magnetically locked switch, placarded TRIM AID,
located on the left console in the front cockpit (Figure 1-27). A green TAD OFF
advisory illuminates on the EICAS when the system is disengaged.
An amber TAD FAIL caution illuminates on the EICAS display if the system has
failed internally. Actuating the trim interrupt button on the control stick grip, or the
TRIM DISCONNECT switch on the trim control panel, removes power from the
rudder tab actuator, including the reference voltage to the TAD, causing the TAD to
disengage, the TRIM AID switch to move to OFF, and the TAD OFF advisory
illuminates on the EICAS display.
If the TAD FAIL caution illuminates on the EICAS display, the TAD system must be
reset by setting the TRIM AID switch to OFF, and then back to TRIM AID. Power for
the TAD is provided through a circuit breaker, placarded TAD, located on the
generator bus circuit breaker panel in the front cockpit.
When engaged, the TAD functions continuously without input from the pilot. Manual
yaw trim input from the pilot is additive to the trim input that the TAD commands.
The TAD automatically sets take-off trim in the yaw axis when the trim aid system
is switched on after engine start.
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