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pitch trim system control circuits and trim changes are accomplished
through the control wheel trim switches. When the switch is
set to SEC, a ground path is provided for the secondary pitch trim
system control circuits and trim changes are accomplished through
the pedestal NOSE DNOFFNOSE UP switch. When the switch is set
to the OFFposition, both pitch trim electrical control circuits are isolated
from the aircraft electrical system . The autopilot is inoperative
with the PITCH TRIM selector switch in theOFFposition .
PM-121
5-11
Change 1
Pilot's Manual
Learjet 31A
CONTROL WHEEL TRIM SWITCHES - PITCH FUNCTION
Each control wheel trim switch is a dual-function (trim and trim arming)
switch which controls primary pitch trim and roll trim. One
switch is located on the outboard horn of each control wheel. Each
switch has four positions: LWD, RWD, NOSE UP, and NOSE DOWN.
The trim arming button on top of the switch must be depressed for
trim motion to occur. With the PITCH TRIM selector switch in the
PRI position, actuation of either switch to NOSE UP or NOSE DOWN
will signal the primary motor in the horizontal stabilizer pitch trim
actuator to move the stabilizer in the appropriate direction. Actuation
of the pilots switch will override actuation of the copilot's switch. Actuation
of either switch to any of the four positions (LWD, RWD,
NOSE UP, or NOSE DOWN) with the trim arming button depressed
will disengage the autopilot if an autopilot CWS switch is not depressed.
PEDESTAL NOSE DN-OFF-NOSE UP SWITCH
The NOSE DN-OFFNOSE UP switch, located on the pedestal trim
control panel, controls secondary pitch trim. The switch is spring
loaded to the center (OFF) position. With the PITCH TRIM selector
switch in the SEC position, actuation of the NOSE DNOFFNOSE UP
switch to NOSE DN or NOSE UP will signal the secondary motor of
the horizontal stabilizer pitch trim actuator to move the stabilizer in
the appropriate direction. Actuation of the secondary pitch trim
switch will disengage the autopilot. With the PITCH TRIM Selector
Switch in the PRI or OFF position, this switch has no trimming effect.
CONTROL WHEEL MASTER SWITCHES - PITCH TRIM FUNCTION
A Control Wheel Master Switch (MSW) is located beneath the control
wheel trim switch on the outboard horn of each control wheel. In addition
to the switch's other functions, either Control Wheel Master
Switch (MSW), when depressed, will inhibit primary or secondary
pitch trim. If the Control Wheel Master Switch (MSW) is used to inhibit
primary pitch trim, primary pitch trim will riot resume until the
Control Wheel Master Switch (MSW) is released and the trim input is
removed. Therefore, during the preflight check of the primary pitch
trim system, it is necessary to release the control wheel trim switch as
well as the Control Wheel Master Switch (MSW) to reset the system.
Secondary pitch trim, however, will be inhibited only as long as the
Control Wheel Master Switch (MSW) is held.
5- 12
PM-121
Original
Learjet 31A
Pilot's Manual
3° FLAP
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CONTROL WHEEL
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PM-121
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PITCH TRIM SYSTEM BLOCK DIAGRAM
Figure 5-3
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II
Pilot's Manual
Learjet 31A
PITCH TRIM LIGHT
An amber PITCH TRIM annunciator light, located on the glareshield
annunciator panel, is installed to alert the crew of primary pitch trim
system malfunctions during flight. Additionally, the PITCH TRIM
light will illuminate whenever either Control Wheel Master Switch
(MSW) is depressed.
T.O. TRIM LIGHT
An amberT.O. TRIM annunciator light, located on the glareshield annunciator
panel, is installed to alert the crew that the PITCH TRIM indicator
pointer is not within the T.O. segment when the aircraft is on
　
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