T-38 Systems (SO1190) Flashcards
Where are the two engine-driven generators located?
on an airframe mounted gearbox in the rear of the airplane
The generators produce ____ current when the engines are running to power the two AC busses
AC (alternating current)
How much load does each generator normally carry? How much are they capable of carrying?
Each generator normally carries one-half the total electrical load, but each generator can carry the entire AC load without an interruption in power
What converts AC power to DC power? Where do they get their power from?
2 transform rectifier units (TRUs) which get their power from the AC electrical buses
What do the TRUs power?
2 essential DC busses and one non-essential DC bus
What provides DC power when the engines are not running or the AC buses are not powered?
a 24-volt, lead acid battery
The battery provides power to the battery bus for:
SEA
Static inverter
Engine start
AB ignition
Where is external power plugged in? What can it power? What kind of current is it?
-plugged into the left aft side of the fuselage
-can power the entire T-38C electrical system
-provides AC power, which powers the TRUs to provide DC power
Where is most electrical equipment located?
in the nose section
How is electrical equipment cooled?
On the ground: electric fan
Airborne: ram air and cockpit air
What is connected to the aircraft for engine starting?
Low pressure air
What supplies electrical power for ignition?
The battery (or APU)
What supplies power to the airframe mounted gearboxes?
the engines
What is the useable capacity of fuel system?
3,906 pounds (583 gallons)
What are the ways the aircraft can be refueled?
-Single point refueling via the receptacle on the left forward section of the fuselage
-Manually using the “over the wing” procedure
How does the useable fuel change with over the wing?
Subtract 6 gallons (40 pounds) if using over the wing
Fuel is supplied to each engine by two separate systems. Each system has its own fuel indicating system. What provides connection to either engine fuel system?
A fuel crossfeed valve
How many fuel pumps are there?
Two fuel pumps for each engine
What are the kinds of fuel pumps? Which is the most essential?
An electrically powered boost pump supplies fuel under low pressure to an engine-driven fuel pump.
The engine can operate on gravity feed without the boost pump, but the engine cannot operate without the engine-driven fuel pump.
How many hydraulic systems are there and what are they?
two hydraulic systems –the utility hydraulic system and the flight control hydraulic system
Are the hydraulic systems connected and how are they powered?
The hydraulic systems are independent and powered by an engine-driven pump mounted on an airframe-mounted gearbox
What engine-driven pump controls which hydraulic system?
Flight control hydraulic system -> right pump
Utility system -> left pump
Both systems operate with hydraulic fluid from separate reservoirs and provide hydraulic power to the primary flight control surfaces. If either system fails,
the remaining system will continue to power the flight controls
What hydraulic system do the wheel brakes belong to?
The wheel brakes are powered by a separate, independent system