Bus Guide Elec Panel
Card Set Information
Bus Guide Elec Panel
Bus Guide Elec Panel
When performing the PRELIMINARY FLIGHT DECK PREPARATION, what is the minimum Battery Voltage?
What do you do if Battery Voltage is < 25.5 volts during the PRELIMARY FLIGHT DECK PREPARATION?
Select BATT push buttons to ON with EXT PWR on aircraft.
How long does it take to charge the aircraft batteries?
When performing the FLIGHT DECK PREPARATION, what are we looking for on the ELEC panel BAT check?
ECAM ELEC page - select
BAT 1 & 2 - OFF then ON
Check BATT charge current is < 60 amps and decreasing within 10 seconds.
Will the batteries completely drain if you leave the BAT switches in AUTO after AC power is removed?
No - Battery cut-off logic prevents complete discharge when the aircraft is on the ground and unpowered - 22 volts DC
How is the BATTERY BUS normally powered?
DC BUS 1 via a DC tie contactor.
What does the amber
light in the GALLEY push button indicate?
At least 1 generator load is above 100% of its rated output.
How does the GALLEY push button work in AUTO?
In AUTO, the GALLEY push button sheds the main galley and in-seat power supply if:
only 1 generator (APU or Engine) is available in FLIGHT, or
only 1 ENGINE generator is available on the GROUND.
What is the max continuous load rating for the Engine and APU generators?
90 kVA is the max engine and apu generator load rating.
What does a FAULT on the ENG GEN push button indicate?
A fault is detected by the GCU:
differential fault (short) and/or
The generator line contactor is open
When is it normal to see the ENG GEN FAULT light illuminated?
Prior to engine start because GEN is selected ON but line contactor is open - a normal condition.
What does the APU GEN FAULT light indicate?
The generator line contactor is open b/c of a fault detected by the GCU.
When is the APU GEN FAULT light inhibited?
APU speed is too low
Line contactor OPEN after either the EXT PWR or ENG GEN takes over.
What is the function of the BUS TIE in the AUTO position?
Allows the BUS TIE CONTACTORS to open and close automatically maintaining power to both AC BUS 1 & 2:
- allows a single source to power the entire sys
- allows connection of the APU GEN or EXT PWR to the system
- inhibits multiple sources to connect simultaneously
What does IDG stand for?
Integrated Drive Generator
What is the function of the IDG?
The IDG converts variable engine speed to constant speed for optimum generator operation (electric/solid state version of a CSD or automatic transmission).
What does an IDG FAULT light indicate? (OOL)
Oil pressure low (inhibited when N2 < 14%)
Oil outlet temperature overheat
Light is inhibited when IDG is disconnected
What precautions must you take when disconnecting an IDG?
Do not disconnect when the engine is not operating or windmilling
Do not hold the disconnect button longer than 3 seconds
How can an IDG be reset?
On the ground by maintenance personnel only.
What is the function of the AC ESS FEED push button when in the normal position?
It allows the AC BUS 1 to power the AC ESS BUS.
How is AC ESS FEED transferred from AC BUS 1 to AC BUS 2?
Manually by selecting ALTN on the AC ESS FEED push button.
What does the AC ESS FEED push button white ALTN light indicate?
AC BUS 2 is powering the AC ESS BUS
What is the purpose of the static inverter?
To provide AC power to the AC ESS Bus from the battery when the ENG GEN is not online when in the Emergency Electrical Configuration.
When is the battery check performed?
During the FLIGHT DECK PREPARATION check of the ELEC panel
What does a BAT FAULT light indicate?
Battery charging current is outside limits (BAT contactor opens).
What are the 3 times the batteries are connected to the BAT BUS?
AC BUS 1 & 2 are not powered and airspeed is below 100kts
What is the priority sequence for electrical power (GEARB)?
EN(s) - engine
XT PWR (manually selected)
AT Emergency Generator
With the APU green
light ON and the EXT PWR blue
light illuminated which system is powering the aircraft?
What is the significance of the
collared circuit breakers on the flight deck?
- Monitored by ECAM system
- Wing tip brake C/B
- Pulled in compliance with prescribed procedure on battery power only (older A-320s only)