Day 6 - Elec, Fuel & Nav Flashcards
What is the minimum speed for the RAT?
140kts
How many aircraft batteries are there?
What’s their Voltage and Amps?
2 x nickel cadmium batteries
28v 23AH
AC ESS BUS is typically powered by AC BUS 1; but can it also be powered by AC BUS 2?
Yes
What are the 2 conditions for disconnecting the IDGs?
Cannot press it for more than 3 seconds
The engine must be windmilling
When will the IDG fault light illuminate?
If oil temp exceeds 180 degrees C
Low oil pressure (but not when N2 is below 14%)
How long does the RAT take to extend?
5 seconds for extension, plus an additional 3 seconds for power supply.
If Gen 1 line is off, what does it still supply power to ?
2 fuel pumps and 1 igniter
How long does the APU take to auto shut down after providing air conditioning?
60-120 seconds at 75%
In order for the RAT to auto deploy, what must fail?
Lose AC BUS 1 and 2, and you must be above 100kts
With only the emergency GEN operating, what bus bars are available?
AC ESS BUS and DC ESS BUSS via the ESS TR
Below 100kts, the DC BAT BUS is automatically connected to and powered by…?
The batteries
Are these colour CBs monitored…?
- green
- black
- red
Green - monitored (for more than 1 min, triggered on the ECAM)
Black - non-monitored
Red - reset by maintenance only
What do the following CB collar colours mean?
Black? Yellow? Red?
Black - System perm deactivated or not installed
Yellow - system deactivated as deferred defect
Red - CVR/FDR deactivated in accordance
Why do Wing tip brake CBs have red caps?
To prevent them being reset
Power supply priority?
1 Gens
2 GPU
3 APU
When will a battery fault light illuminate?
When the charging current for the corresponding battery is outside of limits
In this case the contractor opens.
Is the TAT probe heated?
Inflight yes, but not on the ground
How long to align the ADIRS?
At least 7mins
3 methods of tuning NAV aids?
Automatic
Manual
Back up
The “on bat” light on the ADIRS is on when?
Beginning of a complete IRS alignment
Batteries supply At least one ADIRU
ADIRS 1 usually supply’s which PFD & ND?
Captains side
ADIRS 3 can provide data to which PFD/ND?
Either CPT or FO
How do we normally tune nav aids?
Via the MCDU in Automatic
The ISIS gets Pitot and static data provided by which Pitot and static port?
Sby pitot
Sby static ports
TAT 1 (captains) supplies which ADIRS?
ADIRS 1 and 3.
Which ADIRS does TAT 2 (FOs) supply data to?
ADIRS 2
For a CAT 3 single and dual approach, how many RAD ALTs are required?
2
If you have lost 1 RAD ALT, what cat approach are you limited to?
Limited to a CAT 2 approach
What does a flashing IR fault light mean?
What does a permanent IR fault light mean?
Attitude and heading into may be recovered in ATT mode
The IR is lost and when turned off, FAULT light goes out
Max allowable speed difference between ADIRS 1 and ADIRS 2?
6kts
What is the role of the A320 fuel system?
6 parts
- store fuel (in tanks)
- supplies fuel in correct quantity to tanks during refuelling
- supplies fuel to engines & APU
- circulates fuel to cool IDG
- controls transfer of fuel from centre to wing inner tanks
- keeps fuel in outer wing tanks for wing bending and flutter relief
What are vent tanks for?
To allow for fuel expansion. Anything over 2% max uplift and it begins venting
If fuel temp increases by 20 degrees C, what % does its volume increase by?
2%
Minimum fuel for takeoff?
1500kgs
How can we close the LP fuel valve?
Engine master switch and fire push button
What happens if all electric fuel pumps begin to fail on the aircraft?
Gravity fed fuel. Not suction fed!
Fuel feed sequence?
Centre tank
Wing inner tank
Wing outer tank
How many refuelling panels and refuelling couplings are there?
2 refuelling panels
2 refuelling couplings
Does the aircraft have gravity refuelling points? If so, where?
Yes and in the outer tanks
What controls automatic refuelling of the aircraft?
FQI
What colour is the fuel cross feed “on” light?
White
How long do the centre tank pumps run for when the tank is empty?
5mins
Flashing green “end” light on the refuelling control panel indicates?
Solid green “end” light indicates?
Refuelling has been aborted
Refuelling is completed
Where does the fuel feed from for the engines?
Inner wing tank with 2 pumps
What weight of fuel must the inner tanks drop by, before the centre tank begins refuelling the inner wing tanks?
500kgs used in the inner tanks, then the centre feeds the fuel into the inner tank
At what fuel imbalance (in KGS) will the tank quantity begin flashing green?
When it detects an imbalance of at least 1500kgs
When does the fuel used reset?
At engine start
To cross feed fuel, which tank LP fuel pump must be turned off?
The side with the low fuel
During a fuel imbalance, which side flashes?
The fuller tank flashes green
Total usable fuel?
24,209Litres
At what fuel weight do the transfer valves open?
When either inner tank reaches approx. 750kgs, which is when both inner tank valves open (as they open simultaneously, controlled by the FLSCUs).
What power supply is the AC engine generator and DC system?
AC system : three phase 90 KVA 115/200V 400hz
DC system : 28V
What are the AC Electrical Power Sources?
2 engine generators
One APU
Emergency Generator (RAT)
External power
Static inverter
If all AC sources are INOP, what takes over to supply limited power?
A static inverter will convert DC power from BAT 1 for limited use
If the APU and 2 ENG generators fail, what takes over?
The RAT can supply AC and DC
What are the IDG’s?
Integrated Drive Generators.
Driven at a constant speed.
Providing 3-phase 115 and 200VAC at 400hz.
Each IDG can supply up to 90KVA.
Take priority over all other power sources.
What computer controls the engine gens?
GCU 1 or 2 respectively
Generator control unit.
What computer controls the APU GEN?
The GAPCU
Ground Auxiliary Power Control Unit
IDG fault light illuminates when outlet oil temp exceeds? And when what is low?
180 degrees C
Oil pressure is low (inhibited when N2 below 14%)
TRs do what?
Transfer AC to DC
When will the RAT auto extend?
Loose both AC bus 1 and 2 and speed greater than 100kts
