Aircraft Battery Voltage Procedures

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Questions and Answers

Which of the following components is NOT involved in checking the APU fire detection and extinguishing system?

  • APU FIRE pb-sw
  • MASTER WARN light
  • ECAM
  • APU START pb-sw (correct)

The APU MASTER SW pb-sw should be set to ON before the APU START pb-sw for optimal APU performance.

True (A)

What should the flight crew do if batteries are the only power source?

They should turn on the APU pb on the ECAM control panel.

In cold weather conditions, the flight crew may observe a bleed pressure up to _____ PSI on the APU SD page.

<p>12</p> Signup and view all the answers

Match the following APU components with their functions:

<p>APU FIRE pb-sw = Triggers APU fire warning APU AGENT light = Indicates APU fire agent discharge APU FIRE TEST pb = Tests fire detection system APU START pb-sw = Initiates APU startup sequence</p> Signup and view all the answers

What is the responsibility of the Pilot in Command regarding gear pins?

<p>Ensure gear pins are stowed correctly (B)</p> Signup and view all the answers

To ensure battery voltage is above 50%, BAT 1 and BAT 2 should both show a voltage of above 25.5 V.

<p>True (A)</p> Signup and view all the answers

What should the selection be set to after checking the battery voltages?

<p>APU position</p> Signup and view all the answers

The Pilot in Command (PIC) must ensure the correct number of _______ are stowed onboard.

<p>gear pins</p> Signup and view all the answers

Match the components with their respective actions:

<p>ENG 1, 2 Masters Levers = Control engine power Wipers = Clear windshield Mode selector = Adjust radar settings Gain knob = Control radar sensitivity</p> Signup and view all the answers

What should be done if the battery voltage is at or below 25.5 V?

<p>Charge for approximately 20 minutes. (B)</p> Signup and view all the answers

If the battery voltage is above 25.5 V, no checks are needed on BAT 1 and BAT 2.

<p>False (B)</p> Signup and view all the answers

What should be done if the AVAIL light is on?

<p>Check the EXT PWR push-button switch.</p> Signup and view all the answers

If the aircraft has been electrically supplied during the last 6 hours, the battery voltages should be above ______ V.

<p>23.5</p> Signup and view all the answers

Match the battery voltage conditions with their required actions:

<p>At or below 25.5 V = Charge for 20 minutes Above 25.5 V = Check BAT voltages Lower than 23.5 V on APU start = Risk of APU start abort AVAIL light on = Check EXT PWR push-button switch</p> Signup and view all the answers

What happens if the aircraft is supplied only by batteries for 5 minutes?

<p>Ground horn triggers. (A)</p> Signup and view all the answers

The simultaneous use of EXT PWR B and APU GEN is possible.

<p>False (B)</p> Signup and view all the answers

What is the action required if the EXT PWR does not come on during operation?

<p>Reset using the EXT PWR.</p> Signup and view all the answers

Flashcards

APU Fire Test

A procedure to verify the APU fire detection and extinguishing system's functionality.

APU Fire Warning

Indication of detected APU fire, appearing on ECAM, CRC, MASTER WARN, and APU FIRE pushbutton switch(pb-sw).

APU Start pb-sw

Pushbutton switch to initiate APU start-up.

APU Master SW pb-sw

Pushbutton switch to activate the APU system.

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APU Fuel Feed Line Pressurization

Essential for APU start performance, increased by delaying APU START pb-sw activation for 3 minutes after APU MASTER SW pb-sw activation.

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APU Start Performance

Improved by delaying the APU START pushbutton switch activation for 3 minutes after activating the APU MASTER switch.

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Cold Weather APU Operation

Bleed pressure may fluctuate up to 12 PSI during cold weather (below approximately 10°C), affecting APU and bleed system displays.

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APU Start Limitations

Restrictions on APU starting procedures, likely during refueling/defueling.

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APU Controls and Indicators

Overhead panel components for APU operation.

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Low Battery Voltage (<25.5V)

Battery voltage is at or below 25.5V, requiring a charging cycle.

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Gear Pins Check

The Pilot in Command (PIC) verifies the correct number of landing gear pins are stowed.

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Engine Masters Lever Check

Verify the status of the Engine 1 and Engine 2 Master levers.

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Charging Cycle

Procedure to recharge the battery for approximately 20 minutes.

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Voltage Check Points

Check BAT 1, BAT 2, and APU BAT voltages after charging.

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Engine Start Selector Check

Inspect the Engine Start Selector to ensure it is in the correct position.

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Weather Radar Checks

Verify the status of weather radar components like the switch for the radar, wind shear/precipitation warning system, gain knob, and mode selector.

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High Battery Voltage (>25.5V)

Battery voltage exceeds 25.5V, no charging required

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Aircraft Supplied by Batteries

When the aircraft relies solely on battery power.

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Landing Gear Lever Check

Inspect the landing gear lever position.

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Wiper Selector Check

Confirm both wiper selectors are in the correct position for operation.

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6 Hours Electrical Power

Battery voltage checks are necessary if the aircraft has been electrically powered for more than 6 hours.

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Battery Check (6+ hours)

If the aircraft hasn't had electrical power for 6+ hours, check BAT 1, BAT 2, and APU BAT power switches, and measure BAT 1 and 2 and APU BAT voltage, ensuring a voltage above 25.5 for sufficient charge (above 50%).

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Voltage Threshold Check

Check BAT 1 and BAT 2, and APU BAT voltages against 23.5 V threshold; risk of APU start abortion below threshold.

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AVAIL Light On

Indicates external power availability.

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EXT PWR Connection

Connecting external power to the aircraft.

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EXT PWR A

Preferred external power connection, for supplying GND/FLT buses directly.

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EXT PWR B

External power connection that requires aircraft network energization; cannot supply GND/FLT buses directly.

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Simultaneous EXT PWR and APU GEN

Cannot be used together.

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GPCU Protection Trip

GPCU protection triggers with issues regarding AVAIL light and EXT PWR.

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Study Notes

Battery Voltage Procedures

  • If the battery voltage is at or below 25.5 V, a charging cycle of about 20 min is required.
  • Check BAT 1 pb-sw, BAT 2 pb-sw and APU BAT pb-sw.
  • Check on ELEC DC SD page, battery contactors closed and batteries charging.
  • After 20 min: Check BAT 1 pb-sw, BAT 2 pb-sw and APU BAT pb-sw.
  • After the check, the selector should remain on the APU position.

Battery Voltage Above 25.5 V

  • If the battery voltage is above 25.5 V:
  • Check BAT 1 pb-sw, BAT 2 pb-sw and APU BAT pb-sw
  • After the check, the selector should remain on the APU position.

Aircraft Supplied by Batteries Only

  • If the aircraft has been electrically supplied by batteries only during the last 6 hrs:
  • In case of APU start on battery only, perform the following check:
  • Check BAT 1 pb-sw, BAT 2 pb-sw and APU BAT.

Avail Light is On

  • If the Avail light is on:
  • If only one electrical power is available, ground personnel should connect EXT PWR A since EXT PWR B does not permit to supply directly GND/FLT buses without energizing the total network.
  • The simultaneous use of EXT PWR B and APU GEN is not possible.

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