Figure 2-3. Installation of Heater Probes in Engine

TM 55-4920-244-14

Figure 2-3. Installation of Heater Probes in Engine (Sheet 2 of 2)

h. Place switch SW-6 in RANGE position.

c. Connect egt indicator check adapter to proper ter-

minal posts on aircraft EGT indicator, observing correct

i. Turn potentiometer R-1 until galvanometers reads

polarity.

zero.

d. Place switch SW-1 in E.G.T. position

NOTE

e. Place switch SW-6 in MECH. ZERO position and

The difference between temperature

zero galvanometers by turning MECH. ZERO knob.

readings of °C scale and aircraft EGT

indicator is error of aircraft EGT in-

f. Set °C scale to indicate test temperature.

dicator and should not exceed ap-

plicable aircraft/engine technical

manual tolerance.

g. Turn switch SW-4 aircraft circuit resistance match-

ing aircraft EGT indicator being tested (either or

j. Place switch SW-6 in MECH. ZERO position.

position).

Change 3

2-6