Electrical

Question 1

What cools the starter-generators

Answer 1

Air cooled on the ground by an internal fan

Cooled by ram air in flight

Question 2

How many volts for main battery

Answer 2

24 VDC / 28 amp-hour

Question 3

Where is the battery located

Answer 3

Tailcone

Question 4

Battery overheat annunciations

Answer 4

145-160 degrees, steady annunciator

160+ degrees, flashing annunciator

Question 5

How is the battery charged

Answer 5

From SGs, battery switch must be in BATT position

From GPU, any batter position

Question 6

When does the GCU cut off the starter?

Answer 6

45% N2

Question 7

What are the 4 GCU lights that indicate the unit is not working

Answer 7

1: GCU - GCU has detected an internal fault
2: OV - GCU has detected over voltage condition and shut itself down
3: GF - GCU has detected a ground fault problem and shut itself down
4: SYS - GUC has detected a problem with the aircraft wiring and shut itself down

Question 8

Caution and redline limits for ammeter

Answer 8

Caution 225-300 amps

Redline 300 amps

Question 9

What does the crossfeed bus do?

Answer 9

Acts as a cross tie between L and R main DC buses through 225 current limiters

Question 10

If SGs are online, what powers the crossfeed bus

Answer 10

Main DC buses

Question 11

What powers the crossfeed bus when the battery or GPU is source of power?

Answer 11

Hot battery bus

Question 12

When is the hot battery bus powered

Answer 12

Whenever battery is installed or GPU is connected

Question 13

What is supplied by the hot battery bus

Answer 13

(LIVE)
Lights
Ignition
Volts
Emergency lights/ELT

Question 14

What is PPR (function of the GCU)

Answer 14

Protect
Parallel
Regulate (29 volts)

Question 15

Dual gen failure, how much time for electrical

Answer 15

30 minutes with battery on EMER

Question 16

How long will we have full electrical, minus Air conditioning, while running on the battery?

Answer 16

10 minutes

Question 17

What items are on the EMER bus

Answer 17

N1 gauge
Volts 
Standby gyro (has its own battery pack)
Standby HSI
Standby Airspeed and altimeter
NAV1
COM1
Audio panel
Landing gear control and warning
Flaps
#2 ARHS
#2 ADC
Pitot and AOA heater