ELECTRICS

Aircraft on ground, engine running and DC electric external power available and on line

DC external power has no priority over engine DC generator

DC external power has priority over engine generator

The fist on line has priority

On ground, DC external power on, DC bus tie on isolation

DC bus land DC bus 2 only are isolated

DC and AC bus 2 are shed

Batteries are isolated from their DC ESS/DC emergency bus

DC service and utility bus shed amber light comes on when

Utility bus 1 and utility bus 2 are shed

At least one utility bus is shed

The corresponding DC service and utility bus P/B is switch off

The ground handling cross feed bus (XFR) can be powered:

On the ground and in flight

On the ground, with battery switch selected "ON" only

On the ground even with bat switch selected "OFF"

Bat selector on OVRD means that:

No changement about the supply, each EMER, ESS and STBY bus are forced to be connected to their respective hot bat bus, overriding all other logics and protections

DC/AC STBY busses are transferred from DC ESS bus to DC EMER bus

Each battery continues to be charged by its respective DC bus

In flight one arrow illuminated on the emergency supply shows:

The supply of DC STBY bus from DC ESS or DC EMER bus

The supply of DC EMER and DC ESS bus from DC bus lor DC bus 2

The supply of the DC ESS or DC EMER busses from the corresponding hot battery bus and bat discharging

Depressing "UNDV-OVRD" push button

DC STBY bus and AC STBY bus are supplied from hot EMER bat bus

DC STBY bus and AC STBY bus are supplied from DC bus 2

DC STBY bus and AC STBY bus are supplied from DC bus 1 or DC bus 2

With battery only, AC bus land 2 are:

Never Supplied

Supplied only when bat selector is on OVRD

Supplied when STBY busses p/b is on OVRD

What is the function of the emergency battery while the engine start rotary selection is set to start or crank

During a battery start only it provided start up power if the main battery is weak

During a battery start or when using the opposite generator for a cross start (on ground only) it provides backup starter power if the main battery is weak

It provides positive power to protect critical systems from power transient- never powers the starters

Engines stopped, how can the "DC SVCE/ UTLY BUS" be supplied?

By depressing the "DC SVCE/UTLY BUS" push button in the cockpit and on the "DC GND SUCE BUS' on the cabin attendant panel

With GPU only (EXT power) by depressing the "DC GND SVCE BUS" on the cabin attendant panel

A and B are correct

No external power, no engine running and battery switch "OFF" which services does the DC ground handling (XFR) bus power.

Refuel/defuel system, cargo door and cockpit/ cabin entrance lights L2 mins when selected with the main cabin entry door open

The auxiliary hydraulic pump p/b on the pedestal

A and B are correct

How is the constant frequency AC power obtained?

From each ACW generator

Directly from batteries

Form DC sources through two inverters

What are the capacities of the batteries?

Main battery 24v/42AH, Emergency Battery 24v/15AH

Main battery 28.5v/43 AH, Emergency Battery 28.5v/15AH

Both batteries are 24v/43AH

The "UNDV" light illuminates amber when:

DC STBY bus voltage is lower than 19.5

Battery voltage is below 26.5v

ACW generator voltage is below 115v

"IN FAULT" light illuminated: which statement is correct?

The INV failed and associated AC bus is lost

The INV failed and associated AC bus is supplied through AC STBY bus

The inverter (INV) failed and associated AC bus is supplied through AC BTR by the other INV

In event of both DC bus land 2 power loss:

Inverter 1is automatically supplied by the DC SVCE bus

"b) Inverter 1is automatically supplied by the hot main bat bus or by the hot EMER bat bus in OVRD configuration (or by TRU if selected ON)

Inverter lis not supplied

Inverter 1 normally supplies:

AC BUS 1

AC BUS 1and AC STBY BUS

AC BUS 1and 2 in the event of both DC BUS land 2 power loss

The BTC automatically closed and the flow bar is illuminated in case of:

External PWR operation only

Hotel mode only

Either EXT power operation or hotel mode or single engine operative

Aircraft on ground, "EXT PWR" P/B with "AVAIL" illuminated, to obtain the DC supply you must:

Press the EXT power p/b

Reset DC GEN 1and DC GEN 2

Set batt selector switch on and press the EXT PWR p/b

Once the starter/ generator has started its engine, it operates in the generator mode when:

NH=35%

NH=61.5%

NH=70%

A/C in flight, ACW GEN 1 fails:

All ACW busses remain supplied by ACW GEN 2

ACW SVCE bus only is shed

ACW bus 1 is lost

A/c on ground, engines running at max RPM," ACW EXT PWR" is available and selected on:

Nothing happens to the supply, both ACW GEN are still on line

EXT power has priority over ACW GEN (both)

EXT power supplies ACW BUS 1 GEN 2 supplies ACW BU2

A/Con ground, engines running at max RPM "EXT PWR ACW" supplying the busses, you Select ACW BIC to "ISOL"

ACW BUS lis supplied by EXT PWR ACW BUS 2 is supplied by GEN 2

ACW BUS 2 is lost and ACW BUS is supplied by external PWR

ACW BUS land 2 are lost

Where are the ACW generators connected

The the respective accessory gear box

To the respective reduction gear box

To the respective turbine shaft

ELECTRICS

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