ELO B APU Flashcards
APU location
Top of transition section aft of the #1 enginge
APU Fuel consumption
120 lbs/hr
APU Functions
Pneumatic power: Cabin heating, main engine starting
Electrical power: Ground ops, emergency in-flight ops
*What does the APU provide penumatic power for?
Cabin heating and main engine starting
Fuel cell for APU
1 main fuel cell
Difference between APU fuel supply lines nad main engine fuel system
APU NOT SELF SEALING
Hydraulyic accumulator location and purpose
The accumulator is located in the aft midsection cabin ceiling and provides the hydraulic pressure for driving the start motor
Hand pump location and purpose
The hand pump is located near the accumulator in the aft cabin ceiling, it allows manual recharging of the accumulator when the APU fails to start or if he accumulator pressure is low and an AC power source is not available.
*PSI to start APU
2800 PSI
Hydraulic start motor
Located on APU accessory gearbox
Hydraulic pressure released from accumulator is used to start APU
Type of electricity APU
AC
DC energy source
Batteries
*Which fuel cell supplies the APU?
1
What happens when APU fire T-handle warns the pilot and they pull it
a. Fuel to APU is shut off
b. A stop signal is sent to the ESU/DESU.
c. The fire extinguisher system arms.
d. The directional control valve is set to the APU position.
*What must you do in the event of an APU compartment fire?
Visually confirm there is a fire before taking action.
Communicate
Hit the t handle
Kill
APU location
on the top of the transition section aft of the #1 engine
Four functions of the APU
Pneumatic power for: (1.) Cabin heating. (2.) Main engine starting. Electrical power for: (1.) Ground operations. (2.) Emergency in-flight operations.
Major difference between the APU fuel system and the main engine fuel system
APU Fuel supply lines are not self-sealing
APU Accumulator
Hydraulic accumulator and hand pump: the accumulator is located in the aft midsection cabin ceiling and provides the hydraulic pressure for driving the start motor.
Fuel supply line
(a.) Located between the #1 fuel cell to the APU fuel control. (b.) Supplies fuel from the #1 fuel cell to the APU fuel control for APU operation. (c.) There is a breakaway valve in line but the line is not self sealing.
Emergency functions run off of what type of electrical energy
DC energy because of DC batteries
