ELECTRICAL SYSTEM

通報

問題一覧

In normal configuration, How is DC ESS BUS supplied?

from TR1

What happens in case of total loss of main generators?

the RAT is automatically extended and powers the blue 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?

if the blue system is pressurized, 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 red 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 pb is set to OFF?

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

In cold aircraft configuration (no AC and no DC supply), where the batteries voltage can 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:

Yes

The static inverter works:

when A/C is in flight and on batteries only

On ground, what happens when the “RAT and EMER GEN MAN ON P/B” is pressed in:

the RAT is extended

The static inverter transforms the DC voltage from the battery bus into:

single phase 115 V – 400 HZ 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

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

Yes

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

ESS TR

The IDG regulates the generator:

speed

Generators are sometimes connected in parallel:

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

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

Only one generator is operating in flight:

main galley is automatically shed

Can you reconnect the IDG in flight?

When GEN 1 or GEN 2 is selected off:

the GEN is deenergized and line contactor is open

When the EXT PWR pb green AVAIL lite is illuminated, this means that:

the EXT PWR is connected to the A/C

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 pb to:

off position

The battery FAULT light illuminates when:

charging current increases at an abnormal rate

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

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