Buttons And Switches

Question 1

What connect the DC service bus to the APU battery direct bus?

Answer 1

DC service switch

Question 2

What happens when you turn the battery master on?

Answer 2

Connect / disconnects APU and main battery direct busses to battery busses

Question 3

AC button

Answer 3

Selects AC Power

Question 4

What does the green AVAIL light mean?

Answer 4

External Electrical power is available and ready to use. Correct phase voltage and frequency.

Question 5

What does the IN USE light mean on the AC power button?

Answer 5

External power is supplying power to the AC busses

Question 6

What happens when you push the IDG 1 or 2 switch lights?

Answer 6

The respective IDG is separated from the accessory gearbox. The white IDG light will illuminate.

Question 7

What does illumination of the Amber fault light mean on the IDG switch light?

Answer 7

High oil temperature or low oil pressure is detected in the IDG. (HOT LOP)

Question 8

What happens when you press the AC ESS XFER button?

Answer 8

It illuminates and manually transfers the AC ESS BUS from AC BUSS 1 to AC BUSS 2.

Question 9

Will the AC ESS XFER automatically transfer?

Answer 9

Yes, if a fault is detected on AC BUS 1 it will automatically transfer illumination of the switch light.

Question 10

What do the GEN switches in AUTO do?

Answer 10

Connect the respective generator to its appropriate BUS provided the generator is functioning properly

Question 11

What does GEN switch in OFF / RESET do?

Answer 11

Disconnects the generator from its bus and rearms the generator control circuit

Question 12

Auto transfer buttons on the IDG panel?

Answer 12

Disables automatic transfer of associated IDG

Question 13

Amber AUTO XFER Fail light?

Answer 13

Fault or overcurrent situation has occurred and respective BUS has been isolated preventing auto transfer.

Question 14

Left and Right Hydraulic Shutoff buttons?

Answer 14

Manually closes the hydraulic shutoff valves. Isolates the engine driven pump from the associated hydraulic reservoir. The white light indicates SOV Closed.

Question 15

Hydraulic switches in AUTO Mode?

Answer 15

Automatically operates the pump when any generator online and the Flaps greater than zero

Question 16

At what psi do the hydraulic pumps operate?

Answer 16

3000 psi

Question 17

What kind of hydraulic fluid do we use?

Answer 17

Skydrol (purple color)

Question 18

If hydraulic pump 1A or 2 A fails, will the respective electric pump activate automatically?

Answer 18

No

Question 19

Which hydraulic systems are actively cooled?

Answer 19

Hydraulic systems 1 and 2

Question 20

If there is an engine driven hydraulic pump problem , 1A or 2A , is the associated engine required to be shut down?

Answer 20

No, a shutoff valve is positioned between the pump and the reservoir to isolate the pump from the system

Question 21

What do the left or right engine START push buttons do?

Answer 21

Starts / Stops the engine start sequence

Question 22

What does the CONT Ignition switch light do?

Answer 22

Selects continuous ignition of both igniters on both engines . Both A and B igniters fire continuously. The switch light will illuminate.

Question 23

When will the CONT switch light illuminate and the igniters fire automatically?

Answer 23

FADEC senses a flameout
Just prior to stickshaker during a stall
Airflow is disrupted thru the engine

Question 24

What does the APU PWR FUEL button do when pressed?

Answer 24

APU fuel pump is energized
ECU powers up
An APU IN BITE status message appears on ED 2
APU RPM and EGT gauges appear on ED 2
The door opens when on the ground
The APU fuel shutoff valve opens

Question 25

What does the APU PWR FUEL button do? (Short answer)

Answer 25

Energizes APU fuel pump and opens APU fuel shutoff valve. Accompanied by APU IN BITE message?

Question 26

APU START STOP switch pushed in?

Answer 26

In flight the APU door with modulate open as needed
The Starter motor is energized
The White start light illuminates
At 46 to 60 % RPM the START light extinguishes
At 99% RPM + two seconds the green AVAIL light illuminates

Question 27

APU Start/Stop switch pushed out?

Answer 27

Fuel shutoff valve closes
The APU shuts down
The green AVAIL light extinguishes
The inlet door closes

Question 28

APU START/ STOP button? (Short answer)

Answer 28

1st push. Starts motor

2nd push. 1. Closes fuel shut off valve
2. Extinguishes AVAIL light
3. Closes air inlet door

Question 29

What is the primary purpose of the APU?

Answer 29

Provide electrical power