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Mesa Checkride > Electrical > Flashcards

Electrical Flashcards

1
Q

APU Model

A

Sunstrand APS 2300

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2
Q

Which battery is used for APU start?

A
  • Which battery is used for APU start? Batt 2 powers the starter
  • Batt 1 powers FADEC and EICAS
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3
Q

What fuel pump is used for APU start?

A

Batteries on - DC pump in right tank
AC power - ACMP 2
Right engine running - ejector fuel pump

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4
Q

Will APU shut down automatically during hung start?

A

Yes

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5
Q

What does moving APU switch to off do?

A 
What does moving APU switch to off do? Initiates shutdown
1-minute cool down
No pneumatics (1 min of electric)
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6
Q

What happens if a power generating source fails?

A

Bus ties automatically connect to provide no system degredation

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7
Q

What components power the AC system?

A
  • 2 IDGs
  • APU
  • Inverter
  • Ram Air Turbine
  • AC GPU Receptacle
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8
Q

What components power the DC system?

A
  • 2 NiCad batteries
  • 3 TRUs
  • DC GPU receptacle
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9
Q

How does the IDG maintain a stable power output?

A

A CSD attaches the IDG to the AGB

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10
Q

What monitors and controls the IDGs?

A

GCU

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11
Q

What will cause the amber IDG light on the overhead panel to illuminate?

A

High oil temperature

Low oil pressure

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12
Q

If an IDG is manually disconnected, can it be reconnected by the flight crew?

A

No. Mx only

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13
Q

What is the primary purpose of the AC generators?

A

To power the AC busses and AC ESS bus, which power the 3 TRUs

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14
Q

What is the purpose of the TRUs?

A

Convert 115 VAC to 28 VDC

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15
Q

Can the APU replace a failed IDG?

A

Yes

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16
Q

What is the AC electrical systems priority?

A

Onside, inside, outside, crossside

* Uses onboard AC power before external

17
Q

How is it known that an AC GPU is hooked up and ready to use?

A

GPU icon will show on electrical synoptic page

Avail light will illuminate

18
Q

If the airplane is using the AC GPU and the APU is started , what should the pilot be sure to do?

A

Deselect the GPU button before the next GPU connection

19
Q

What will charge the batteries?

A

Any AC power source

20
Q

How long will the aircrafts batteries last with no recharging?

A

10 minutes

21
Q

What is the purpose of the DC GPU receptacle?

A

For APU start with voltage

22
Q

What is the minimum battery temp for APU start?

A

-20 C

23
Q

What is the minimum battery voltage to close the bus ties?

A

18 volts

24
Q

What battery is used for the APU start?

A

Batt 2 powers the start bus

Batt 1 powers the FADEC and EICAS for monitoring

25
Q

What is the purpose of the inverter?

A

Converts 28VDC to 115VAC from batteries to power AC STANDBY BUS when AC source isn’t available

26
Q

What is on the AC STANDBY BUS?

A

Engine 1A and 2A exciters

27
Q

What powers the RAT?

A

Airflow turns the RAT propeller which spins the turbine inside

28
Q

When will the RAT deploy?

A

Automatically deploys if AC BUSes are not powered or manually

29
Q

How long after deployment before the RAT will supply power?

A

8 seconds

30
Q

Is there a total loss of power during the 8 second RAT deployment?

A

No. Batteries supply power to the DC ESS BUSes and AC STANDBY BUS

31
Q

What does the RAT power?

A

ESS BUSSES

32
Q

What is the minimum airspeed for the rat?

A

Load shedding begins at 130 KIAS

33
Q

When is the RAT icon displayed on the electrical synoptic page?

A

When the RAT is deployed

34
Q

What manages the electrical system?

A

4 ICCs and 2 SPDAs

35
Q

What is an ICC?

A

An electrical control device that provides power distribution and protection for electrical loads

36
Q

What is an SPDA?

A

An electrical load management unit that distributes electrical loads to the aircraft systems according to system logic

37
Q

Can the flight

A

ICC CBs can only be reset by mx

SPDA CBs can be reset via the MCDU

Mesa Checkride (19 decks)

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