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double-throw, center-off, momentary-action, rotary switch located
on the trim switch panel (Figure 5-4) in the center pedestal. This
switch is constructed in two sections with poles that are not mechanically
linked. One pole of the switch is used to provide control of the
rudder trim ARM circuit and is referred to as the ARM switch. The other
pole of this switch is used to provide either nose left or nose right
trim commands and is called the rudder trim switch. These poles are independent
of each other except of the fact that they are both rotated by
the same shaft. The failure of one pole will not affect the other. Since one
pole provides ARM control and the other provides the trim command
inputs, the failure of one pole will not result in a trim runaway. Setting
and holding the switch to the NOSE LEFT or NOSE RIGHT position energizes
the trim tab actuator, resulting in the rudder rotating either
clockwise or counterclockwise. A trim tab position sensor is attached to
the rotary actuator shaft and provides input via the #2 data acquisition
unit for display of rudder trim position on the cockpit engine indicating
and crew alerting system.
Electrical power for rudder trim is provided from the R ESS BUS and
protected by TRIM-RUD 5-amp circuit breaker located on the copilot’s
circuit breaker panel (FLIGHT group). Rudder trim can be stopped by
depressing and holding either control wheel master switch.
Pilot’s Manual
PM-126A 5-23
TRIM INDICATIONS
Pitch, aileron, and rudder trim indications are provided on the EICAS
and the MFD. A digital display of pitch trim position (PIT TRIM) is always
in view below the CAS window, on the right side of the EICAS.
Pitch (PIT), aileron (AIL), and rudder (RUD) trim are digitally displayed
on the SUMRY page. They are arranged in a vertical column labeled
FLT on the right side of the SUMRY page. The SUMRY page is the
power-up default display on the EICAS. The SUMRY page is displayed
at the base of the MFD. Trim indications are correspondingly displayed
on the left side of the FLT system schematic page.
The following CAS illuminations are specific to the trim indications:
PITCH TRIM INDICATIONS
Pitch trim tab position is presented as both analog and digital display.
The label PITCH, in cyan, is positioned above the pitch trim tab position
digital readout. The range of pitch trim is from 0 to 10, and with 0
being maximum nose down trim and 10 being maximum nose up trim.
The analog scale consists of a white vertical line with three horizontal
tick marks on the right side. The labels NDN and NUP are displayed at
the left top and bottom of the scale, respectively. The digits 0 and 10 are
displayed at the right top and bottom of the scale, respectively. The
analog scale has a white takeoff band located between 5.5 units and
8.7 units. There is a pointer which moves up and down the left side of
the scale in accordance with the digital readout of the pitch trim tab position.
If the pitch trim is not within the takeoff band, and the airplane
is on the ground, the digital display of trim will have a white box
around it and a message posted to CAS. If power is advanced for takeoff
(MCR or greater) and pitch trim is not within the takeoff band, the
“CONFIGURATION” voice warning will sound and the CAS message
turns red along with the digits, pointer and box in the trim position display.
Invalid data will replace the digits with amber dashes, and the
pointer and box are removed.
CAS Color Description
TAKE OFF TRIM Red The aircraft is on the ground and either thrust
lever is advanced to MCR or above, and aircraft
trim (pitch, aileron, or rudder) is not set
for takeoff.
TAKE OFF TRIM White The aircraft is on the ground and aircraft trim
(pitch, aileron, or rudder) is not set for takeoff.
Pilot’s Manual
5-24 PM-126A
AILERON TRIM INDICATIONS
Aileron trim tab position is presented as both analog and digital display.
The label AILERON, in cyan, is positioned above the aileron trim
tab position digital readout. The range of aileron trim position is from
L12 to R12 and with L being left wing down, and R being right wing
down. The analog scale consists of a white arc with three tic marks on
the outside of the arc. The digits 10, in white, are displayed at the left
and right ends of the scale, respectively. A white takeoff trim band is located
on the outside of the scale between the values of +5 and -5. A
pointer moves along the inside of the scale in accordance with the digital
readout of the aileron trim tab position. If the aileron trim is not
within the takeoff band while the airplane is on the ground the digital
　
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