T M 5 5 - 4 9 2 0 - 4 1 4 - 1 3 &P
Table 3-1. operator’s Controls
Control, indicator, or connector
POWER DC indicator
POWER AC indicator
VALVE CURRENT digital meter
BOOST PRESS ON indicator
BOOST PRESS OFF indicator
SAS PRESS ON indicator
SAS PRESS OFF indicator
AC POWER connector J2
POWER DC ON-OFF switch
POWER AC ON-OFF switch
CURRENT CONTROL DECR-INCR
potentiometer.
TRIM switch:
ON position
OFF position
SAS switch:
ON position
OFF position
BOOST switch:
ON position
OFF position
DC POWER connector J1
DC circuit breaker
AC circuit breaker
TRIM COIL SELECT 1-BOTH-2 switch
POSITION XDCR test jacks:
STICK INPUT
TRIM PISTON
+15 VDC, -15 VDC, and SIG GRD test jacks
J3 (Rear of Test Box)
Function
Lights green when J1 is connected to 28 vdc and POWER switch
is ON and DC circuit breaker is pushed in.
Lights red when J2 is connected to 115 vac and POWER switch
is ON and AC circuit breaker is pushed in.
Indicates current applied to pitch trim and SAS servo valves
during nulling procedure.
Lights green when external boost pressure switch is activated
(pressurized).
Lights green when external boost pressure switch is not activated
(not pressurized).
Lights green when pilot assist module SAS pressure switch is
activated (pressurized).
Lights green when pilot assist module SAS pressure switch is
not activated (not pressurized).
Accepts cable to provide test set with source of 115 vat, 60 Hz
single-phase power.
Controls application of 28 vdc to test set.
Controls application of 115 vac to test set.
Increases or decreases current level to servo valves on SAS
actuator or pitch trim actuator. The control has a friction lock.
Opens normally - closed trim turn-on valve.
Closes normally - closed trim turn-on valve.
Opens normally - open SAS shutoff valve.
Closes normally - open SAS shutoff valve.
Opens normally - open boost shutoff valve.
Closes normally - open boost shutoff valve.
Accepts cable to provide test set with source of 28 vdc power.
Opens 28 vdc power input on loads over 5 amps. Reset by
pushing in.
Open 115 vac power input on loads over 2 amps. Reset by
pushing in.
Selects one, two, or both trim solenoid coils for actuation.
Provides point of test for pitch trim servo stick input position
transducer output.
Provides point of test for pitch trim servo trim piston position
transducer output.
Provides point of test for internal +15 VDC and -15 VDC
power supplies.
Accepts cables allowing outputs from and inputs to Test Box
from unit under test.
3-2
