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EMB-120 AN > Flight Safety Systems Questions > Flashcards

Flight Safety Systems Questions Flashcards

1
Q

The EMB 120 has how many generators?

A

5

2 x Main Generators
2 x Auxilary Generators
1 x APU Generator

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2
Q

How is the forward entry door raised and lowered?

A

The door normally raised hydraulically and lowered manually with hydraulic dampening.
However it can be raised manually from outside with help from ground staff.

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3
Q

Can the direct vision windows be removed by the

crew?

A

Yes.

In case of an emergency, due loss of visibility through main windshield or cockpit evacuation.

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4
Q

What happens if the main entry door is not securely closed and locked?

A

The FORWARD light on the DOORS panel illuminates.
The DOORS light on the MAP illuminates
Aural WARNING

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5
Q

How many cycles can the forward entry door be operated without recharging its accumulator?

A

4 Complete cycles.

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6
Q

What happens if the main entry door actuator remains pressurized after closing?

A

The door will be hydraulically blocked. Emergency valve in cockpit will need to be used to allow the door to be lowered.

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7
Q

How is AC electrical power provided?

A

2 x 250VA, 400Hz Static Inverters

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8
Q

What do the inverters convert 28VDC into?

A

115 and 26 VAC

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9
Q

Which buses do the inverters normally power?

A

Inverter #1 powers all 4 AC buses, Inverter #2 as

standby.

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10
Q

How many batteries are installed on the aircraft?

A

2

1 x 24VDC, 36 AH NiCad or Lead acid, Main battery.

1 x 24VDC, 5 AH Sealed Lead acid, backup battery.

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11
Q

Where are the batteries located?

A

In the nose of the aircraft, accessible through a panel just forward of the cockpit.

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12
Q

How are the batteries ventilated?

A

Forced airflow in flight.

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13
Q

How long will the main battery power essential loads?

A

Approx 30 Minutes

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14
Q

Is the battery always connected to the Hot Battery

Bus?

A

Yes.

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15
Q

What happens when you position the PWR SELECT switch to BATT? `

A

The battery contactor is is closed, connecting the battery to the central DC bus.

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16
Q

When will the battery contactor protection device open?

A

When the current from the central DC bus to the battery exceeds 500amps.

17
Q

On the ground with the battery as the only power source what systems are inhibited by safety switch?

A
  • Re-Circulation fans
  • Gasper fans
  • Ground cooling fans
18
Q

What happens if the battery exceeds 70*C ?

A
  • “Battery” Voice warning
  • BATT OVERHEAT on MAP
  • Master WARNING flashes
19
Q

How many temperature sensing gauges are there for the Battery Temperature Monitoring System?

A

2 in the battery case.

1 provides signal to the gauge.
1 provides signal to the warning system.

(During test there may be a difference between warning activation and gauge temperatures)

20
Q

What is the purpose of the backup battery?

A

Primary Purpose - Supply uninterupted power to standby horizon
Secondary purpose - Provide stabilized power supply to sensitive instruments during power transients such as battery start.

21
Q

What is the rating of the Starter/Generators?

A

28VDC 400amps (600-Amps during engine start)

22
Q

When does the GCU command the Starter to operate as a generator?

A

50% NH

23
Q

During engine start which bus supplies the starters?

A

Central DC BUS

24
Q

Which buses do the main generators directly supply?

A

Relay Box DC BUS 1 or 2, then DC BUS 1 or 2

25
Q

What is the rating of the Auxillary Generators?

A

28VDC 150amps

26
Q

What drives the respective Auxillary Generators?

A

Propeller reduction gearbox

27
Q

At what Np do the auxillary generators connect to the electrical system?

A

> 70% Np

28
Q

What is the rating of the APU generator?

A

Same as main generators, 28VDC 400amps

29
Q

At what RPM is the APU generator able to provide nominal electrical power output?

A

95%

30
Q

Can the APU and external power source both provide power to the central DC bus simultaneously?

A

No, EXT PWR has priority

31
Q

Can the main generators and external power source both provide power to the central DC bus
simultaneously?

A

No , Main generator has priority

32
Q

When will the overvoltage relay open to protect the central DC bus from, a over voltage in the external power?

A

32VDC

EMB-120 AN (5 decks)

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