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Cirrus CSIP > Electrical > Flashcards

Electrical Flashcards

1
Q

What kind of electrical system is the SR20 equipped with?

A

2 Alternator, 2 Battery, 28-Direct Volt Current (VDC) redundant system.

Negative-ground.
___________________
Alternators are controlled by the MCU (Master Control Unit) and require battery voltage for start. (not self-exciting)

ALT 1 - Belt driven, 100 Amp mounted on the right front of the engine. Regulated to 27.7 V.

ALT 2 - Belt driven, 70 Amp mounted on the left front of the engine. Regulated to 28.7 V.
____________________
BAT 1 - 24V, 11A mounted on the right firewall.

BAT 2 - 2-12V , 7A sealed lead acid batteries connected in series to make 24V. Located in a vented, acid-resistant container behind the aft cabin bulk head, below the parachute canister.

BAT 1 is charged from the Main Distribution Bus 1 in the MCU.
BAT 2 is charged from CB panel ESS BUS 1.

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2
Q

Draw and explain a schematic of the SR20 electrical system:

A

Let there be art (POH 7-50)

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3
Q

Batteries ____ power

A

Store

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4
Q

Alternators ____ power

A

produce

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5
Q

Buses _____ power

A

Manage

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6
Q

Switches/Relays _____ power

A

control

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7
Q

Diodes/Regulators _____ power

A

Measure, Protect, Regulate

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8
Q

What are the 5 POWER SOURCES on the SR models?

A

ALT 1
ALT 2
BAT 1
BAT 2
EXT PWR

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9
Q

What are Volts

A

Electric Pressure (potential energy)

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10
Q

What are Amps

A

Electric Current

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11
Q

Battery 1 discharge while Alt 1 is functioning normally, indicative of:

A

an internal power distribution failure within the MCU.

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12
Q

BAT 1 is charged from:

A

the Main Distribution Bus 1 in the MCU.

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13
Q

BAT 2 is charged from:

A

the circuit breaker panel ESS BUS 1.

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14
Q

The Master Control Unit (MCU) is located on the left firewall. The MCU controls:

A

ALT 1, ALT 2, starter, landing light, EXT PWR…

and power generation functions.

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15
Q

Power is supplied to the airplane circuits through 3 distribution buses contained in the MCU: ___, ___, ___

The 3 distribution buses power the:

A

Main Distribution Bus 1, Main Distribution Bus 2, and the Essential Distribution Bus.

associated BUSES on the circuit breaker panel.

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16
Q

When will the over-voltage protection relay kick an ALT offline?

A

31.75V

17
Q

MAIN DISTRO BUS 1 and 2 are interconnected by:

What does this ensure?

A

An 80-amp diode.

The diode prevents ALT 2 from feeding the MAIN DISTRO BUS 1. (Additionally, ALT 2 Bus voltage being slightly higher than ALT 1 voltage further assures this separation.

(POH 7-48)

18
Q

The ESS DISTRO BUS is fed by both Main Distribution Bus 1 and Main Distribution Bus 2 in the MCU through __________.

A

two 50-amp fuses

19
Q

The MCU provides: (4 THINGS)

A
  1. ALT 1 and ALT 2 voltage regulation
  2. External power reverse polarity protection (diodes take care of this)
  3. Alternator overvoltage protection
  4. Electrical system health annunciations to the Integrated Avionics System
20
Q

The ESS DISTRO BUS powers the ______ and ______ through 30-amp fuses located in the MCU.

A
  • ESS BUS 1,
  • ESS BUS 2.
21
Q

MAIN DISTRO BUS 1 directly powers the _____ _____ through a 7.5-amp fuse, and ____, _____, and _____. (CB buses)

A

Landing Light

  • A/C BUS 1,
  • A/C BUS 2,
  • MAIN BUS 3.
22
Q

Main Distribution Bus 2 powers ____. _____. and _____ through 30-amp fuses located in the MCU:

A
  • NON ESS BUS,
  • MAIN BUS 1,
  • MAIN BUS 2.
23
Q

What does “internally rectifying” mean in regard to the alternators?

A

?? They convert AC to DC ??

24
Q

What is the difference between AC and DC?

A

AC periodically reverses direction.

DC flows in only 1 direction.

25
Q

The Constant Power Bus (CONV) is fed by ____

A

BAT 1

26
Q

In the event of multiple electrical failures, what is the order in which ESS BUS 1/2 will be powered?

A

ALT 1/2
BAT 1
BAT 2 (ESS BUS 1 only)

27
Q

What are the 5 components that are controlled by the MCU?

A

ALT 1
ALT 2
STARTER
LANDING LIGHT
EXT PWR

28
Q

How many Circuit Breaker Buses are there?

A

10

2 on the ESS DIST BUS
3 on MDB1
4 on MDB2

29
Q

Rectifiers convert the Alternator output from ____ current to ____ current.

A

AC to DC

alternating to direct

30
Q

What will the flight deck look like if you’re only running on BAT2 power?

A

PFD with consolidated Primary Flight Instruments, EIS, NAV 1, and COM 1

Standby Instruments

31
Q

What are the 7 components on the Non-Ess Bus?

A

Pitot HT
Nav light
Strobe light
Starter
Avionics Fan 1
Flaps

32
Q

With a Cabin Fire, what will you be left with in your flight deck?

A

PFD A
Standby Instruments

Trim
Stall warning
Ice Protection 2
Engine Instruments

Cirrus CSIP (11 decks)

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