because of low battery voltage, momentarily depress switch under 
ledge and just above the control panel. 
3. Wait 15 to 30 minutes for stabilization of the electronic equipment. 
4. Check calibration of system. 
2.2 CALIBRATING PROCEDURE 
This calibration check should be made after the equipment has been turned on for at least 
15 minutes and about every 2 to 4 hours during the test. 
2.2.1 Rudder Control Channel 
a. Set RUDDER CONTROL SELECTOR switch to mode of operation to be used 
for majority of tests. 
b. Place the rudder control knob at the ZERO rudder angle position. Check rudder 
shaft position by viewing the digital indicator on the servo unit. If rudder is not at zero, 
adjust CF BAL control of rudder discriminator in model. 
c. Set control knob to 45-degree PORT and STBD positions. Check servo tracking 
at these points. If these points are off more than 0.5 degree, adjust the SENS control on the 
rudder discriminator. There is some interaction between the SENS and CF BAL controls, so 
a readjustment of both may be required. NOTE: Due to slight nonlinearities in various control 
circuit elements, it is almost impossible to obtain exact tracking over the whole range of 
rudder positions. 
2.2.2 Rudder Readout Channel 
a. Set rudder servo to zero on the digital position indicator. The rudder position 
indicator on the console should be at 0-degree. If not, adjust CF BAL control on the rudder 
discriminator in the console. 
b. Set rudder servo unit to 45-degree PORT and STBD positions and check meter 
indication. If scale spread is not correct, adjust SENS control on the discriminator. 
c. Repeat preceding steps if necessary. 
2.2.3 Propulsion Control Channels 
The propulsion channel circuitry normally will not require adjustment. The direction 
of motor rotation should be checked and if desired, motor speed may be checked against con- 
trol lever position. When two separate propulsion channels are used, it may be desirable to 
adjust the discriminator SENS and CF BAL controls so that control lever settings are similar 
in the desired operating range. 
Ill-7 
