Electrical

通報

問題一覧

What happens in case of a loss of both AC 1 and AC 2 busses when airspeed is greater than 100 kts?

The RAT is automatically extended and powers the blue system, which drives the emergency generator

In normal configuration, How is DC ESS BUS supplied?

From TR 1

What happens in case of total loss of main generators when airborne?

The RAT is automatically extended and powers the blue hydraulic system which drives the emergency generators

AC ESS Bus is normally supplied by?

AC BUS 1

DC BAT BUS can be supplied by:

DC BUS 1, DC BUS 2 or batteries

AC BUS tie contactors enable the electrical system:

To be supplied by any generator or external power

What happens during the EMER GEN test?

The blue system is manually pressurized with the override switch and the emergency generator comes on line

Normal minimum battery voltage before APU start is:

25.5 V

When disconnecting the IDG, the button should be pressed:

For no more than 3 secs

On the EMER ELEC PWR panel, a FAULT light illuminates under the RAT and EMER GEN label. What does it mean?

Emergency generator is not supplying when AC BUS 1 and 2 are not powered

What happens when the GEN 1 LINE pushbutton is set to OFF?

AC BUS 1 is powered by GEN 2 because GEN 1 line contactor is opened

In cold aircraft configuration (no AC and no DC supply), where can the battery voltage be checked?

On the ELEC overhead panel

AC ESS BUS is normally supplied by:

AC BUS 1

In flight, on batteries only, the AC ESS SHED BUS and the DC ESS SHED BUS are lost:

True

The static inverter works:

When the aircraft speed is above 50 knots, the inverter is automatically activated, if nothing but the batteries are supplying electrical power

On ground, what happens if the MAN ON pushbutton on the EMER ELEC PWR panel is pressed in:

The RAT is extended

The static inverter transforms the DC voltage from the BATTERY BUS into:

Single phase 115 V - 400 hertz AC current

In flight, in case of loss of all main generators, emergency generator not running, the static inverter supplies:

APU and ENG start + AC ESS bus

The external power has priority over the APU GEN:

Yes

When operating, GEN 1 and 2 have priority over APU GEN:

True

With APU available, if one generator fails, the failed generator is replaced by:

The APU

The ESS TR may be used to replace a faulty TR:

Yes

In flight, in case of loss of all generators, emergency generator not running, the DC ESS bus is supplied by:

BAT 2

In case of loss of all main generators and the emergency generator in flight, the DC ESS BUS is supplied by:

HOT BUS 2

In case of loss of all main generators in flight, but emergency generator running, the DC ESS BUS is supplied by:

ESS TR

The IDG regulates the generator:

Speed

Generators are sometimes connected in parallel:

False

If AC BUS 1 fails, the AC ESS BUS is supplied by:

AC BUS 2

In case of total electrical loss the AC ESS BUS is supplied by:

Static inverter

In emergency configuration, AC ESS SHED BUS is automatically:

Shed if the RAT stalls

If only one generator is operating in flight:

Automatically shedding part of galley load is performed

Can you reconnect the IDG in flight?

When GEN 1 or GEN 2 is selected to off:

The GEN is de-energized and line contactor is opens

When the EXT PWR pushbutton green AVAIL lite is illuminated, it means:

The EXT PWR is connected to the A/C and the parameters are normal

When are the batteries supplying the DC BAT BUS:

Both (APU starting) and (Loss of AC bus 1+2 (speed < 100 kts))

When you want to check battery voltage, you must set the BAT pushbutton to:

Off position

The BAT FAULT light illuminates when:

Charging current is outside limits

In certain cases, the static inverter is supplied by:

BAT 1

BUS TIE contactors when closed enable AC BUS 1 and 2:

To be supplied by anyone of the main generators or external power

In case of the TR (1 or 2) failure, does the ESS TR supply the DC ESS BUS:

Yes

The green EXT PWR pb AVAIL light is ON, what does it mean?

The EXT power is plugged in, and parameters are normal

Which statement is correct?

GEN1 and GEN 2 have the highest priority on their own buses (AC Bus 1 and 2)

Can the generators be connected in parallel?

Whats the purpose of the TR’s?

To Transform and Rectify A/C power to D/C power

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