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S-76C++ > Electrical System > Flashcards

Electrical System Flashcards

1
Q

Draw the electrical system

A

See image

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2
Q

DC system voltage

A

28

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3
Q

DC power sources

A

Battery
Gen 1
Gen 2
Ext power

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4
Q

Generator voltage and amperage

A

28 VDC

200 amps

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5
Q

Starter Cycle Limits with fuel ignition

A 
60 sec on
60 sec off
60 sec on
15 min off
Repeat
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6
Q

Starter cycle limits without fuel ignition

A 
30 sec on
30 sec off
30 sec on
15 min off
Repeat
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7
Q

What is powered with the battery switch on?

A

Battery bus and essential bus

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8
Q

If the Essential Volts Low caution light and the Essential Bus recovery light are on with the battery switch and one generator operating what does that indicate?

A

Battery voltage is less than 24 +/- 0.5 Volts

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9
Q

Which inverter can be powered by the battery and how?

A

The #2 Inverter can be powered through the DC Ess Bus by turning on the battery switch and the #2 inverter switch.

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10
Q

What happens automatically when you plug in external power?

What happens when you turn on the external power switch?

A

The battery is isolated to the battery bus by the external power contactor.

The external power contactor allows the external power source to power the DC Ess bus and the Bus Tie Contactor allows the external power to power the rest of the electrical system.

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11
Q

What can happen during an external power start?

A

DECU can enter self test mode causing the loss of T5 and/or N1. Abort start.

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12
Q

Can a single generator power the entire system?

A

Yes

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13
Q

What does the bus tie contactor do?

A

Isolates the battery to the batt and DC Ess busses to prevent excessive draining.

Allows the battery to be charged.

Allows external power to power entire electrical system.

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14
Q

What happens when you activate the Essential Bus Recovery System?

A

The #1 generator is taken offline.

The #2 generator is connected to the DC essential bus through the Ess bus recovery contactor bypassing the faulty bus tie contactor.

The Air Cond is turned off.

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15
Q

What does the Ess Volts low light indicate?

A

The bus tie contactor has failed and the Ess bus has drained the battery to 24 +/- 0.5 volts or less.

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16
Q

What illuminates in conjunction with the Ess volts low caution light?

A

The Ess bus recovery light over the Ess bus recovery switch.

17
Q

In the event of a dual generator failure, how long can the pilot’s pitot heat be used without affecting the 30 min night IFR usage? The search light?

A

Pitot heat for 5 min

Search light for 1 min on landing

18
Q

What is lost if both inverters fail?

A

Complete AC electrical system including:
DAFCS
Compass and CDI portions of EHSI

19
Q

What is the battery voltage and capacity?

A

24 V

42 AH

20
Q

What are some items on the DC Ess Bus?

A 
Landing Gear
Search Light
Fire Detection and Suppression
IIDS
Pilot EFIS
#2 Radio
#2 AP
Stick trims
Upper anti-collision light
ICS
DECU
Radio and EFIS master switches
21
Q

What is on the battery bus?

A

Tail rotor and intermediate gearbox viewing lights

Light in cockpit

22
Q

What are the two voltages of the AC electrical system?

A

26 VAC

115 VAC

23
Q

What should you do in electrical emergency?

A

R - reduce load
A - autopilots
T - transition to VMC

24
Q

How many electrical busses are there?

A

8

DC essential
No 1 DC Primary
No 2 DC Primary
Battery

No 1 AC Primary
No 2 AC Primary
No 1 26 VAC
No 2 26 VAC

25
Q

How do you access the electrical page on the IIDS?

A

Press menu, then elec

26
Q

Which busses have current limiters? Can the pilot reset them?

A

DC Ess
No 1 DC Primary
No 2 DC Primary

No

27
Q

Where are the AHRS circuit breakers located?

A

5-2-5

5 rows up from bottom on lower panel

2 rows up from bottom on upper panel

5 rows up from bottom on upper panel

28
Q

What does the Generator Control Unit do?

A

Regulates generator output voltage (primary purpose)

Protects against over voltage, under voltage, reverse current and ground fault conditions.

29
Q

What are the DC Junction box components?

A 
No 1 and No 2 start contactors
No 1 and No 2 generator contactors
Bus tie contactor
Master start contactor
Battery contactor
External power contactor
External power interlock relay
Three current limiters
30
Q

What are the inverters rated at?

A

375 VA (watts)
115 and 26 VAC
400 Hz
Single phase

31
Q

Where are the Buss tie circuit breakers located?

A

Right and left side of the upper row of the upper panel

S-76C++ (7 decks)

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