TM 1-1520-238-T-5
7–134
Change 4
7–45.
PRESSURIZED AIR SYSTEM – MAINTENANCE OPERATIONAL CHECK (cont)
7–45
PAS AIR FLOW
M68-039
ICE DETECTOR SENSOR
Figure 7–58.
Ice Detector Sensor
h. On pilot ANTI ICE panel (fig. 7–56), set
PITOT ICE DET AD SNSR switch to OFF.
Air flow from ice detector sensor (fig. 7–58)
stops.
If air flow from ice detector sensor does not stop, refer
to TM 1-1520-238-T-8 to troubleshoot anti–ice
system.
i. On pilot instrument panel, check FUEL
quantity indicator (fig. 7–59). Note which
tank has the greater amount of fuel.
If FUEL quantity indicator shows both tanks full, go to
step l below.
j. On pilot FUEL panel (fig. 7–60), position
TRANS switch as required to transfer fuel
from the tank with the greater amount of fuel
noted in step i above. FUEL quantity
indicator shows fuel transfer.
If FUEL quantity indicator does not show fuel transfer,
have assistant check for airflow at cockpit ECS vents.
If airflow is present, go to TM 1-1520-238-T-7 to
troubleshoot the fuel quantity indication/transfer
system. If airflow is not present, locate and repair
broken PAS manifold, or replace air pressure
regulating valve TM 1-1520-238-23).
M68-040
Figure 7–59.
Pilot FUEL Quantity Indicator
