РАТА (24 || 25)

ATA 24: ELECTRICAL || ATA 25: EQUIPMENT

In normal configuration, how is the L AC ESS 3 BUS supplied

  • R AC BUS.
  • L AC BUS.
  • C. AC ESS INV BUS

The static INVERTER transforms DC power into:

  • 1 KVA, Single Phase 115 V, 400 Hz AC Power.
  • 10 KVA Three Phases 115200V 400 Hz AC Power.
  • 15 KVA Single Phase 115 V 400 Hz AC Power.

In case of Flight with Batteries Only, where are the R DC ESS BUSSES connected to?

  • To batteries 2 and 4.
  • To batteries 1 and 3.
  • To batteries 1 and 2.

In normal configuration, how is the L DC ESS 1 BUS supplied?

  • From TRU 1.
  • From ESS TR.
  • From TRU 2.

How can the L DC ESS 1 BUS be supplied?

  • L DC BUS
  • L DC ESS 3 BUS and BAT 3 or BAT 1 or TRU 1
  • ТRU 3.

The required Minimum Battery Voltage before APU start is:

  • 24.0 V.
  • 27.5 V.
  • 25.0 V.

The EXT PWR has priority over the APU GEN when EXT PWR push button is ON only in the right portion of the ELEC SYS. The APU GEN has priority over the EXT PWR in the left portion of the ELEC SYS.

  • True.
  • False.

GEN 1 & 2, when operating have priority over the APU GEN?

  • Yes.
  • No.

Where can the batteries voltage be checked on a cold aircraft?

  • On the EWD ELEC page.
  • On the ELEC overhead panel.
  • There is no indication.

The AC in flight with APU Power available. If one ENG GEN fails, the failed generator can be replaced by:

  • The APU GEN
  • The other ENG GEN.
  • The EMERGENCY PWR INVERTER.

The STATIC INVERTER is connected to the L DC ESS 1.

  • True.
  • False.

ENGINES GENERATORS are sometimes connected in parallel?

  • True.
  • False.
  • True but only with APU.

The RAT GEN automatically disconnects from Buses at the aircraft speed below.... kts and the emergency generator network .... :

  • 116...is completely de-energized.
  • 125 kts ...automatically transfers to the batteries.
  • 116 kts...automatically transfers to the batteries.

Is it possible to reconnect either IDG in flight?

  • Yes.
  • No.

In case of failure of TRU 1, TRU 1 is automatically disconnected from DC ESS buses and TRU 2 is automatically connected to the buses of the failed DRUG.

  • True.
  • False.

What is the normal priority for supplying Electrical Power to the Aircraft?

  • ENG ENG - EXT PWR - APU GEN - Bats - RAT.
  • ENG GEN - EXT PWR - APU GEN - RAT- BATTs.
  • APU GEN - EXT PWR - ENG GEN - RAT- BATTs.

What is the purpose of the STATIC INVERTER?

  • The STATIC INVERTER reverses the phases to supply the AC ESS BUSSES .
  • The STATIC INVERTER takes over if the ESS TR unit fails.
  • If all GENs fail, the STATIC INVERTER changes DC power from the batteries in AC power.

The green EXT PWR pushbutton AVAIL light is displayed when:

  • The EXT PWR is plugged in and its parameters are normal.
  • B. The ac network is supplied.

While the AC is in flight with only one GEN operating...

  • Category 3 customers are automatically shed.
  • Category 2+3 customers are automatically shed.
  • One generator can takeover with no shedding at all.

Simultaneous operation of the main Generators, APU GEN, EXT PWR and RAT is not possible.

  • False
  • True

What is the purpose of a Transformer Rectifier (TR) unit?

  • A TR unit is an overload protection for the system.
  • A TR unit converts AC power to DC power.
  • A TR unit ensures a very constant voltage for sensitive electronic equipment.

On the ground when the electrical system is initially powered by EXT PWR or by APU GEN the AC ESS 4 BUS is supplied

  • ...directly from the R AC BUS.
  • ...from the BATTERIES by means of the STATIC INVERTER.
  • ...from BATTERY 1 by means of the STATIC INVERTER.

The RAT rated power is 15 KVA at a speed exceeding

  • 80 Kt
  • 50 Kt
  • 125 Kt

Is there any possibility to check the Water Tank QTY from the Cockpit ?

  • Yes in the Overhead Panel.
  • No. The related Control Panel is in the Cabin FWD Attendant Panel.
  • No. The related panel is in the Cabin AFT Attendant Panel.

It takes approximately seconds for the slide to deploy.

  • 6 seconds.
  • 10 seconds.
  • 15 seconds.

The maximum time of flight with batteries only is limited to:

  • 27 minutes.
  • 35 minutes.
  • 20 minutes.

If on board, the Emergency Locator Transmitter ADT 406S operates for at least:

  • 24 hrs (continuously) in COSPAS-SARSAT mode (406 MHz).
  • 60 hrs (continuously) on 121.5 and 243 MHz.
  • Both A and B are correct.

The number of portable oxygen bottles provided in the passenger cabin is:

  • 3
  • 4
  • 5

The number of escape slides that can be used as floating devices are:

  • 4
  • 6
  • 8

The SMOKE HOOD effective time of use is:

  • 15 min.
  • 30 min.
  • 22 min.

When selecting the CKPT DOOR switch to UNLK position, the door remains unlocked for:

  • 5 seconds.
  • 10 seconds.
  • 20 seconds.

During pre-flight check, crew has to be sure that storage battery of the emergency Flashlight is charged; the light- emitting diode must flash at 10 seconds intervals maximum.

  • True.
  • False.