TM 55-4920-431-13
Section IV.
OPERATION UNDER USUAL CONDITIONS
2-4. Preparation for Use.
a. Turn pressure equalizer knob to OPEN. Open case. Turn knob to CLOSE.
b. Remove harnesses from case lid.
d. Zero meters.
e. Perform your before (B) PMCS.
2-5. APU Test. Connect the tester for use in
the aircraft in
accordance with figure
2-2. Perform test in accordance with the applicable maintenance manual.
NOTE
During tests, leave BLEED AIR OPEN/CLOSE switch,
MAX. AIR switch, and ECONO AIR switch in down
position.
2-6. ESU Test. Bench test of
the ESU is
accomplished by
using an
oscillator to
simulate the tach input from the magnetic pickup in the APU. Millivolt supplies are
used to simulate EGT thermocouple inputs from the APU. Connections are made
through the ST93930 simulation device as shown in figure 2-3. Perform check in
accordance with TM 55-1520-240-T.
Section V.
Not applicable.