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CHAPTER FOUR
STUDENT GUIDE FOR T-1A AIRCRAFT SYSTEMS
406. FUEL SUPPLY SYSTEM CONTROLS AND INDICATORS
The fuel supply system uses a network of sensors, probes, and switches to determine and report
status in terms of volume, temperature, and pressure. Fuel status is then reported on needle-
pointer gauges and annunciators. Fuel system indicators (located on the center instrument panel)
use pointers to show fuel temperature and fuel quantity on gauges. Fuel system annunciators,
(located on the main annunciator panel) use illuminated legends to show caution and warning
levels of line/tank pressure and fuel quantity.
Fuel Temperature Controls and Indicators
A bulb installed in the right wing tank senses fuel temperature. Sensed temperature is displayed
on a gauge labeled FUEL TEMP C, located to the right of the fuel quantity indicators on the
center instrument panel. The temperature gauge is calibrated in degrees C, and uses a single
pointer attached to the center top of the gauge face.
Fuel Quantity Indicating Group
The fuel quantity indicating group includes the following:
1.  One wing tank fuel quantity indicating group for each wing tank including the respective
fuel feed chamber
2.
One fuel quantity indicating group for all fuselage tanks
Each group's status is reported using an indicator located on the instrument panel.
Fuel Quantity Indicators
All the fuel in the fuselage tanks is reported on one gauge. Fuel remaining in each wing tank is
reported separately on the other gauge using two separate pointers on a shared gauge.
1.
Wing Tank Fuel Quantity System - Each wing tank uses four fuel probes: one in each
wing tank bay, and one in the fuel feed chamber.
2.
Fuselage Tanks Fuel Quantity System - The fuselage fuel quantity indication system uses
four fuel probes: two in the left mid tank, one in the aft cabin tank, and one in the aft fuselage
tank.
3.
Fuel Level Low Annunciator - When a wing tank fuel level drops to approximately 32
gallons of usable fuel, an amber legend L FUEL LEVEL LO or R FUEL LEVEL LO illuminates
on the main annunciator panel to indicate a low fuel level in the respective wing tank.
4.
Fuel Feed Quantity Low Annunciator - When approximately 11 gallons of usable fuel
remain in the fuel feed chamber, a fuel feed low-level light on the main annunciator panel
illuminates the legend L FUEL FEED or R FUEL FEED to indicate a low fuel level in the
respective feed chamber.
4-4
FUEL SUPPLY SYSTEM


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