Electrical System

Question 1

Electrical System:

Whats is the voltage of the DC electrical system?

Answer 1

28 Volts

Question 2

Electrical System:

What are the ** four** sources of electrical power for the aircraft?

Answer 2

• Starter Generator
• Standby Generator
• Battery
• Ground Power Unit

Question 3

Electrical System:

The battery provides power for? 🔋

Answer 3

• For starting (if no GPU)
• Supply systems (if no generators)

The battery is always connected to BATT BUS (except if crash lever is down)

Question 4

Electrical System:

The **Starter Generator **only performs as a generator once…

Answer 4

The starting sequence is compelted.

Question 5

Electrical System:

In the event of a failure the Standby Generator supplies what voltage?

Answer 5

28-volts DC

Question 6

Electrical System:

On ground, the generator load should be maintained below…

Answer 6

200 Amps.

Question 7

Electrical System:

Avoid using the Standby Generator at full load when…

Answer 7

On ground.

Question 8

Electrical System:

In an emergency situation, to save battery power, it is possible to shed the loads that are not essential for flight by…

Answer 8

“ESS BUS TIE” switch to EMER position.

In this configuration, only “ESS BUS 1”, “ESS BUS 2” and “BATT BUS” bars are supplied.

Note:
Supplying “BUS 1”, “BUS 2”, “BUS 3”, and “BUS 4” bars is always possible, resetting “ESS BUS TIE” switch to NORM position.

Question 9

Electrical System:

Resetting circuit breakers: If a non-essential system breaker trips..

Answer 9

Do NOT reset in flight.

Question 10

Electrical System:

Resetting circuit breakers: If an essential system breaker trips..

Answer 10

1. Wait for 3 minutes to cool down before resetting.
2. If it trips again, do not reset.

Question 11

Electrical System:

Battery power is always connected to…

Answer 11

BATT BUS
(except if crash lever down).

Question 12

Electrical System:

The main electrical power source is…

Answer 12

…the starter generator

Question 13

Electrical System:

The** standby generator** supplies a 28-volt standby direct current which may be used in case of…

Answer 13

Main generator failure.

Question 14

Electrical System:

With the Crash Lever DOWN will their be an electrical supply?

Answer 14

No electrical supply.

Question 15

Electrical System:

With the Crash Level UP will their be an electrical supply?

Answer 15

• On the ground, regardless of source and generator selector, the BATT BUS is connected and the Electrical Power Source—EPS check is performed.
• Then, the electrical power source and generator, according to the source and generator selectors.

Question 16

Electrical System:

Which electrical source is selected?

Answer 16

Source GPU (Ground Power Unit)

if GPU disconnection to reset: GPU source, OFF then GPU

battery and GPU simultaneously connected to Main Bus.

Question 17

Electrical System:

Which electrical source is selected?

Answer 17

Source Battery

To reset the battery source, OFF then BATT.

Question 18

Electrical System:

Which electrical Generator is selected?

Answer 18

Standby generator connected to Main Bus.

Question 19

Electrical System:

Which electrical Generator is selected?

Answer 19

Starter generator connected to Main Bus.

Question 20

Electrical System:

Which control is show below?

Answer 20

Main generator reset push-button.

Question 21

Electrical System:

Which control is show below?

Answer 21

Stand-by generator reset push-button.

Question 22

Electrical System:

Which position is the ESS BUS TIE swtich in?

Answer 22

EMER position.
In this configuration, only “ESS BUS 1”, “ESS BUS 2” and “BATT BUS” bars supplied.

Question 23

Electrical System:

What is the purpose and function of this control?

Answer 23

Controls 2 swiveling floodlights.
It illuminates the instrument panel assembly in case of visor lighting tubes and/or instrument integrated lighting failure.

Question 24

Electrical System:

What is the minimum battery voltage for engine start?

Answer 24

**>24.5V **

NOTE: if not, use a GPU or charge battery. This minimum voltage is not an absolute guarantee for a correctly charged battery. It is recommended to use a GPU in cold weather, when airplane has been stopped more than three hours at a temperature below -10 °C (+14 °F).

Question 25

Electrical System:

What voltage should be displayed when a GPU is conected and GPU source selcted?

Answer 25

28 Volts

CAUTION: low voltage (around 24.5 V) may indicate that only the battery is powering the airplane and not the pair GPU + battery. Make sure that a GPU is connected and powering the airplane.

Question 26

Electrical System:

if 24.5 V is displayed when a GPU is conected and GPU source selcted what may this indicate?

Answer 26

May indicate that only the battery is powering the airplane and not the pair GPU + battery.

Make sure that a GPU is connected and powering the airplane.

Question 27

Electrical System:

What is the volage, minimum and maximum amps required for the GPU?

Answer 27

• 28-Volts regulated voltage, with negative on earth
• 800 A minimum
• 1,000 A maximum.

See placard located near ground power receptacle door.

Question 28

Electrical System Memory Items:

Total loss of electrical power…

Answer 28

Use the MD302 for:
* attitude,
* airspeed,
* altitude, and/or
* heading.

Question 29

Electrical System Memory Items:

Answer 29

1. SOURCE selector . . . . OFF
2. SOURCE selector . . . . BATT
   If warning persists:
   Land as soon as possible

Question 30

Electrical System Memory Items:

Answer 30

1. GENERATOR select . . . . Check/Correct if necessary
   If warning persists:
   Main generator switching is confirmed.
2. MAIN GENERATOR RESET push-button . . . . Press

Question 31

Electrical System:

The external power connector (GPU plug) is located:

Answer 31

On the left forward fuselage

Question 32

Electrical System:

To test the STBY GEN, the MAIN LOAD must be:

Answer 32

<80 Amps