Overhead Panel (Pictorial) NOT COMPLETED

Question 1

What does the DC Service switch power?

Answer 1

Level 1 Knowledge:

DC Service Switch - Connects DC Service to the APU battery direct bus

1. Drains the APU battery if left on.
2. Not normally used by us

Level 2 Knowledge

1. Powers Lights (NAV, becon, service, boarding, toilet, and galley dome)
2. Boarding announcement
3. Cabin lights, upward and downward
4. Service Bus feed
5. Power sensing (Service Bus and TRU)
6. Chart holder
7. Water and waste control

Question 2

What lights will illuminate with the Battery Master on?

(NO AC power established)

Answer 2

Overhead lights that turn on with the Battery Master Switch ON

1. AC ESS XFER Switch light
2. INOP Left and Right Boost Pump Switch lights
3. Fault Press Cont
4. Off Left and Right Packs

Screens that turn on with the Battery Master Swtich ON

1. ED1
2. ED2
3. ISI

Center Console things that turn on with the Battery Master Switch ON

1. Mach Trim
2. Backup RTU

(1 on 1st row, 2 2nd row 3 3rd row)

Question 3

What does the illumination of the AVAIL portion on the AC switch light indicate?

Answer 3

Level 1

1. The system has the correct voltage, frequency, and phase but is not currently being used by the aircraft

Level 2

1. 115 Volts
2. 400Hz
3. 3 Phase

Question 4

What does the illumination of the INUSE portion on the AC switch light indicate?

Answer 4

Level 1

1. Indicates external AC Power is being used to power the aircraft

Level 2

1. AC Bus 1 Powered
2. AC Bus 2 Powered
3. AC ESS Bus Powered
4. AC SERV Bus

PLEASE SEND EDIT SUGGESTION WITH MORE BUS INFORMATION AND OR CORRECTIONS

Question 5

What does the illumination of the FAULT portion of the IDG guarded switch light mean?

Answer 5

The associated IDG (Integrated Drive Generator) has either low oil PSi or High oil temperature.

HOTLOP Memory aid

Question 6

What does the illumination of the DISC portion of the IDG guarded switch light mean?

Answer 6

The associated IDG (Integrated Drive Generator) has been disconnected.

The IDG has to be reset by maintenace on the ground with the engines off.

Question 7

What does the illumination of the AC ESS XFER swtich light indicate

Answer 7

AC BUS 1 is not powering the AC ESS BUS

Manually pressed – Transfer ESS Bus to AC Bus 2

(Only done if QRH tells you to)

Question 8

When should a generator be reset?

Answer 8

When directed by the QRH

Example: QRH ELEC 12

Question 9

What does the illumination of the FAIL portion of the AUTO XFER switch light mean

Answer 9

Auto transfer disabled or inhibited because of a Bus Fault or Generator overcurrent

1. The associated GCU (Generator control unit) has detected a BUS fault or generator overcurrent
2. Affected generator is taken offline
3. GCU inhibits the auto transfer system on the afected side
4. Associated AC BUS can no longer be powered by the APU or other side generator

Question 10

What does the illumination of the OFF portion of the AUTO XFER switch light mean

Answer 10

Auto transfer off

This would only happen if the QRH told you to turn it off.

PLEASE SEND EDIT SUGGESTION WITH MORE BUS INFORMATION AND OR CORRECTIONS

Question 11

Firex Detection Button

What is associated with the SUCCESSFUL fire test

Answer 11

11 Lights and FIRE SYS OK advisory Message

1. FIRE SYS OK advisory message
2. Left and Right ENG and APU FIRE PUSH switch light illuminate
3. Left and Right APU BOTTLE ARMED PUSH TO DISCHARGE switch light illuminates
4. Both MASTER WARNING Flashers Illuminate
5. FWD and AFT CARGO SMOKE PUSH switch lights illuminate
6. Cargo BOTTLE ARMED PUSH TO DISCHARGE switch lights

Question 12

Firex Detection Button

What is associated with the FAILURE of the fire test

Answer 12

One or more of the 11 Lights will not be illuminated and there will be NO FIRE SYS OK advisory Message. The lights that are not illuminated are the problem areas with the Firex detection system.

Question 13

What is the function of the left or right HYD SOV guarded switch light

Answer 13

To Close the HYD SOV which shuts off the flow of hydraulic fluid to the associated EDP (Engine Driven Pump)

Also, Engine Fire push switch also closes the HYD SOV.

Question 14

What does the INOP portion of the Left or Right Boost Pump indicate?

Answer 14

The pump PSI is too low

Question 15

What does the ON portion of the Left or Right Boost Pump indicate?

Answer 15

The pump outlet PSI is satisfactory, it’s pumping fuel

Question 16

What happens when you press the Left or Right Boost Pump switch light?

Answer 16

You arm the fuel boost pump for the Left or Right side

Question 17

What does the FAIL portion of the GRAVITY XFLOW switch light indicate?

Answer 17

The gravity cross flow valve is not in the commanded postion.

Question 18

What does the OPEN portion of the GRAVITY XFLOW switch light indicate?

Answer 18

Indicates the GRAVITY XFLOW SOV is Open.

There will be a GRAVITY XLFOW OPEN status messaes

Question 19

What does the FAIL portion of the Left or Right XFLOW switch light indicate

Answer 19

Crossflow pump failed to energize

Question 20

What does the ON portion of the Left or Right XFLOW switch light indicate

Answer 20

Crossflow pump energized, fuel directed into low tank

Side that is illuminated is the low tank

Question 21

Explain how the XFLOW AUTO OVERRIDE switch light works when it’s NOT pressed in

Answer 21

Switch is NOT illuminated, Crossflow pump is avalible for automatic crossflow.

In auto mode, when there is a 200 lbs imbalance between the two wing tanks the the auto transfer will transfer fuel from the higher tank to the lower tank. The lower tank light turn ON until the two tanks are equal plus 50 lbs.

Question 22

Explain how the XFLOW AUTO OVERRIDE switch light works when it is pressed in

Answer 22

Switch is illuminated

Inhibits automatic mode

In manual mode, Click on Left or Right XFER FUEL ON swtich light to transfer fuel from the one tank to the other tank.

Crossflow pump is ONLY avalible for manual crossflow.

The tank with the XFER FUEL ON light illuminated is the tank that is receiving the fuel.