TM 55-4920-429-13
Table 2-1. Test Set Controls and Indicators — Continued
CONTROL/lNDICATOR
DESCRIPTION
STATUS A indicator DS7
STATUS B indicator DS8
GYRO TEST Group
ROLL/PITCH/HDG/HDG ERR
SIGNAL MONITOR switch S12
XY/YZ/ZX SIGNAL MONITOR
switch S 13
SIGNAL SEL 2 switch S24
Switch, rotary, 7-position.
Selects discrete input signals for display when SEL 1/SEL 2 switch is at
SEL 2.
RADAR ALT VALID. Signal from radar altimeter is displayed.
RADAR ALT SELF TEST GO. Signal from radar altimeter is
displayed.
L ROLL BEEP, TRIM ON. Signal from pitch and roll trim switch is
displayed.
R ROLL BEEP, TRIM ON. Signal from pitch and roll trim switch is
displayed.
VERT GYRO VALID. Signal from vertical gyro is displayed.
HYD PRESSURE FULL. Signal from hydraulic pressure switch is
displayed.
BIT ENABLE STOP. Signal from engine condition levers is displayed.
NOTE:
All input signals to SIGNAL SEL 2 switch are processed
through the DISCRETE SIGNAL MONITOR before being
displayed.
Indicator light (green).
Lights to indicate magnitude (or closed condition) of selected discrete
signal is at proper level for active state.
Indicator light (amber).
Lights to indicate magnitude (or open condition) of selected discrete
signal is at proper level for inactive state.
Two switches used in conjunction with GYRO TEST position of METER
SOURCE switch.
Switch, rotary, 4-position.
Used in conjunction with XY, YZ, ZX SIGNAL MONITOR switch.
Selects input signals from vertical gyros, directional gyro, and hsi for
monitoring on meter.
ROLL. 400 Hz roll signals from the attitude gyros are monitored.
PITCH. 400 Hz pitch signals from the attitude gyros are monitored.
HDG. 400 Hz heading signals from the directional gyro are moni-
tored.
HDG ERR. 400 Hz heading error signal from the hsi is monitored.
Switch, rotary, 3-position.
Selects XY, YZ or ZX synchro signals pairs selected by ROLL/PITCH/
HDG/HDG ERR SIGNAL MONITOR switch for monitoring on meter.
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