TM 9--2350--292--20--1
0028 00--1
AUXILIARY POWER UNIT HIGH AIR TEMPERATURE LIGHT IS ILLUMINATED
AND SUMP FAN IS NOT RUNNING.
0028 00
THIS WORK PACKAGE COVERS:
Auxiliary Power Unit High Air Temperataure Light Is Illuminated And Sump Fan Is Not Running
INITIAL SETUP:
Tools and Special Tools
General mechanic’s tool kit (item 1, WP 0717 00)
Multimeter (item 84, WP 0717 00)
Materials
Adhesive (item 25, WP 0716 00)
Equipment Conditions
Vehicle MASTER switch OFF (TM 9--2350--292--10)
APU cover removed (WP 0413 00)
Personnel Required
Two
no
yes
A
CONTINUED ON NEXT PAGE
WARNING
Remove rings, bracelets, wristwatches,
and neck chains before working on any
vehicle. Jewelry can catch on equip-
ment and cause injury, or may short
across an electrical circuit and cause
severe burns or electrical shock.
NOTE
The high air temperature switch is
normally open and set to close on
temperature rise of 446_F +18_.
If oil temperature rises above 200_F
the APU engine oil and oil filter must
be replaced (WP 0597 00).
Does sump fan run?
NOTE
Remove sealant from electrical terminals to
ensure good contact for multimeter leads.
Apply adhesive to all exposed terminals after
troubleshooting is complete.
1. Disconnect harness 3W730 lead 233A and
ground wire from sump fan thermostatic switch.
2. Place a jumper wire between harness 3W730
lead 233A and ground wire.
3. Turn MASTER switch ON (TM 9--2350--292--10).
4. Turn FUEL SHUTOFF switch ON
(TM 9--2350--292--10).
5. Observe sump fan.
6. Turn FUEL SHUTOFF and MASTER switches
OFF.
Replace sump fan
thermostatic switch
(WP 0660 00). Verify
fault is corrected.
