Fuel Supply System Controls and Indicators

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

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.

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.

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.

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.

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.

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FUEL SUPPLY SYSTEM