Overhead Panel - AQP

Question 1

What does turning on the DC Service switch do on the EPCP ?

Answer 1

Turning the switch on

• connects the DC Service bus directly to the APU BATT DIR BUS

(Normally powered by TRU 2 when AC power is available)

OFF: DC service bus is powered by TRU 2, if AC power is available

Question 2

Battery Master Switch ON does what?

Answer 2

Connects the Main Battery and APU battery to the Battery Bus via the main battery Direct Bus and the APU battery Bus

OFF: Isolates the battery bus from the main and APU Battery Direct Busses

Question 3

When does the AVAIL light for the APU on the EPCP mean?

Answer 3

AVAIL illuminates green to indicate the external AC power source is connected and is within limits (Voltage, phase and frequency)

Question 4

What does the IN USE portion of the AC switchlight mean on the EPCP?

Answer 4

Illuminates to indicate that the external AC power unit is supplying the electrical system. AVAIL light will extinguish when the IN USE light illuminates

Question 5

What does the FAULT light mean on the IDG disconnect switch?

Answer 5

Illuminates for:

• Low IDG oil pressure
• High IDG oil temperature
• NOTE IDG will automatically disconnect when a generator over temperature or overtorque condition occurs

Question 6

What does the DISC on the IDG switchlight mean on the EPCP?

Answer 6

Press to disconnect the IDG. The DISC light illuminates white when the IDG has disconnected.

Question 7

What does the ALTN mean on the AC ESS XFER switch on the EPCP?

Answer 7

It means it is not being powered by Bus 1

ALTN illuminates white when the AC ESS Bus is powered by AC Bus 2 (Normal source is Bus 1)

NOTE: If AC Bus 1 voltage or frequency is faulty, the AC Essential bus is automatically powered by AC Bus 2 and the switch illuminates (White)

This is monitored by the GCU (Generator Control Unit) and could take the AC BUS 1 offline, thru

• Over/Under Voltage
• Over/Under Frequency
• Generator and bus Over current
• Generator Phase Sequence
• AC Power Center

Question 8

What does the OFF/RESET and AUTO on the Generator switch mean on the EPCP?

Answer 8

Disconnects the generator from the associated AC Bus
- Resets the generator control circuit

AUTO: Connects the generator to the associated Bus if all conditions are satisfied

Question 9

What does the OFF/RESET and AUTO mean on the APU generator switch on the EPCP?

Answer 9

• Disconnects the APU generator from the AC Bus(es)
• Re-arms the generator control circuit

AUTO: Connects the APU generator to the AC Bus(es) if all conditions are satisfied

Question 10

What does the FAIL light mean on the AUTO XFER switchlight (for the AC BUS) on the EPCP?

Answer 10

Illuminates for a bus fault (Priority/Auto transfer system automatically inhibited). Associated AC bus can not be powered by the APU or the offside generator and cannot be reset in the air

Question 11

What does OFF mean on the AUTO XFER switchlight (for the AC bus) on the EPCP?

Answer 11

OFF: Press in to disable the priority/auto transfer system, OFF illuminates white. Press again to restore normal operation

Question 12

What happens when you push in L/R BOOST PUMP switch on the FCP?

Answer 12

PUSH IN:

• During engine start - booth boost pumps operate
• Engine running - pumps are armed and automatically operate when low pressure is detected in either engine fuel feed line

Question 13

What does the ON light mean on the L/R BOOST PUMP switchlight on the FCP?

Answer 13

ON - illuminates when the associated pump is operating

Question 14

What does the INOP portion mean on the L/R BOOST PUMP switchlight on the FCP?

Answer 14

INOP : A low pressure condition has been detected in the associated engine feed line, the respective boost pump has not been armed, or has failed.

Question 15

What does RELEASE OUT do on the L/R BOOST PUMP switchlight on the FCP?

Answer 15

RELEASE OUT: Disarms the respective boost pump

Question 16

What happens when you push in the GRAVITY XFLOW switchlight on the FCP?

Answer 16

Push In: Opens the gravity crossflow valve. The OPEN light illuminates

Question 17

What happens when you RELEASE OUT the GRAVITY XFLOW switchlight on the FCP?

Answer 17

Release Out: Closes the gravity crossflow valve. The OPEN light extinguishes

Question 18

What does the FAIL portion mean on the GRAVITY XFLOW switchlight on the FCP?

Answer 18

FAIL: The gravity crossflow valve is not in the commanded position

Question 19

What happens when you push in the L/R XFLOW switchlight on the FCP?

Answer 19

Push In: The XFLOW pump operates and transfers fuel to the selected side (must have the XFLOW AUTO OVERRIDE switch selected to manual mode for the pump to operate).

The ON light illuminates

Question 20

What happens when you RELEASE OUT the L/R XFLOW switchlight on the ECP?

Answer 20

The XFLOW pump stops

The ON light extinguishes

Question 21

What does the FAIL portion on the L/R XFLOW switchlight on the FCP mean?

Answer 21

The XFLOW pump fails to operate or is in an uncommanded position

Question 22

What happens when you PUSH IN the XFLOW AUTO OVERRIDE SWITCH on the FCP?

Answer 22

• Arms the XFLOW pump for manual XFLOW operation

- Automatic operation is disabled (MAN light illuminates white)

Question 23

What happens when you RELEASE OUT the XLOW AUTO OVERRIDE switchlight on the FCP?

Answer 23

Arms the XFLOW pump for automatic crossflow operation.
Manual operation is disabled (MAN light extinguishes)

Note: L and R XFLOW shutoff valve switchlights illuminates ON (white) when auto XFLOW operates automatically (controlled by the Fuel System Computer)

Question 24

What does the CLSD portion of the BLEED VALVES rotary switch on the BLEED AIR panel mean?

Answer 24

Closes all bleed sources. This position should be selected when an external pneumatic ground cart is in use to prevent damage to the engine or APU bleed systems

Question 25

What is the AUTO portion mean on the BLEED VALVES rotary switch on the BLEED AIR panel?

Answer 25

The air conditioning system controllers manage the configuration of the pneumatic system

Question 26

What does the MANUAL position mean on the BLEED VALVES rotary switch on the BLEED AIR panel?

Answer 26

Enables the crew to manually configure the pneumatic system using the bleed source and isol switches

Question 27

EXPLAIN L ENG, R ENG, BOTH ENG, APU positions of the BLEED SOURCE KNOB on the BLEED AIR panel?

Answer 27

NOTE: BLEED SOURCE KNOB IS ENABLED WHEN THE BLEED VALVES ROTARY SWITCH IS IN THE MANUAL position!

L ENG: Opens the left bleed air valve if the left engine is operating; closing the right engine bleed valve and the APU Load Control Valve

R ENG: Opens the right bleed air valve if the right engine is operating; closing the left engine bleed valve and APU Load Control Valve

BOTH ENG: Opens the left and right bleed air valves if the associated engine is operating; closes the APU load control valve

APU: Opens the APU Load Control Valve if the APU is operating; closes the left and right engine bleed air valves

Question 28

What does the NORMAL position on the WING A/I CROSS BLEED knob represent?

Answer 28

The wing cross bleed valve is closed

Question 29

What does the FROM LEFT position on the WING A/I CROSS BLEED knob represent?

Answer 29

Opens the wing cross bleed valve and closes the right wing anti-ice valve

Question 30

What does the FROM RIGHT position on the WING A/I CROSS BLEED knob represent?

Answer 30

Opens the wing cross bleed valve and closes the left wing anti-ice valve

Question 31

What does OPEN and CLSD mean on the ISOL switch on the BLEED AIR panel mean?

Answer 31

OPEN: Opens the bleed isolation valve

CLSD: Closes the bleed isolation valve