Electrical

Question 1

Max continuous amperage of the engine driven generators

Answer 1

300 amps

Question 2

The two main aircraft batteries and emergency battery can be charged by..

Answer 2

GPU, APU, and one or both engine driven generators

(PTM pg 2-4)

Question 3

Each engine has an alternator which provides

Answer 3

AC power to heat the same-side windshield

Question 4

The voltage readings on the EICAS are taken from (3)

Answer 4

the Left Essential Bus, Right Essential Bus, and Emergency Battery Bus
(E3)

Question 5

When the main aircraft and emergency batteries are providing power to their respective busses

Answer 5

the EICAS voltages will read approx. 24 volts

(PTM pg 2-12)

Question 6

When the aircraft generators, APU generator, or a GPU is powering the aircraft

Answer 6

the voltage readings on the EICAS will read approx. 28 volts

Question 7

During engine start, the amperage readout for the APU or the starter/generator driving the starter will

Answer 7

exceed 300 amps

(AFM pg 1-13)

Question 8

In the event of a single generator failure, the bus tie should

Answer 8

close after a 5 second ground fault check

(PTM pg 2-34)

Question 9

Which busses are auto-shed during a single generator failure?

Answer 9

Left and Right Non-Essential Busses

(PTM PG 2-34)

Question 10

Which busses are auto-shed after a dual generator failure?

Answer 10

Left and Right Main
Left and Right Avionics
Left and Right Non-Essential

(MAN)
(PTM PG 2-36)

Question 11

During a dual generator failure, the bus tie

Answer 11

remains open

(PTM PG 2-36)

Question 12

What is auto-shed during a dual generator failure?

Answer 12

Outside (exterior) lights
Wing/Stab Heat
Left and Right Main
Left and Right Avionics
Left and Right Non-Essential

(OH MAN)!

(PTM PG 2-36, 3-12)

Question 13

In the event of a dual generator failure, a left and right amber NAC on the EICAS will appear because

Answer 13

the NAC SOV’s fail open, but the P2T2 probes are auto-shed

Question 14

When connecting a GPU, the bus tie should

Answer 14

close

Question 15

When connecting the APU generator before the left generator comes online, the bus tie should

Answer 15

Close

PTM p2-9

Question 16

How many times can a circuit breaker be reset, if popped?

Answer 16

One time

Question 17

Circuit breakers with red rings denote

Answer 17

equipment powered by the Emergency Battery Bus

Question 18

During engine start, the Left and Right Essential contactors open to prevent

Answer 18

voltage spikes from damaging sensitive avionics components

(PTM pg 2-30)

Question 19

During engine start, the Left and Right Essential contactors open resulting in the Emergency Battery powering the

Answer 19

Left and Right Essential bus
Left and Right Essential Avionics bus
Emergency Battery bus

(PTM pg 2-30)

Question 20

The voltage reading on the EICAS should read 24 volts across all busses during engine start showing the voltage output of

Answer 20

Only the Emergency Battery Bus

Question 21

In the event of a loss of both generators and both main batteries, the first step is to

Answer 21

select each battery “ON,” one at a time

Question 22

During initial power up, the batteries should be selected on

Answer 22

simultaneously

Question 23

The GPU is limited to

Answer 23

1500 amps

Question 24

When the GPU is powering the aircraft, the

Answer 24

Left Generator, Right Generator, and APU Generator cannot come online

Question 25

When the APU generator is powering the aircraft, the engine driven generators will come on line

Answer 25

automatically once the engines are running

Question 26

The APU generator will share the amperage load with

Answer 26

the right generator (PTM pg 2-23)

Question 27

A GPU or APU should be used for engine start

Answer 27

below 0°C (PTM pg 2-52)

Question 28

The APU has been demonstrated to start

Answer 28

at -23°C

Question 29

The Lear 45 electrical system is a _____-bus system, with the _____ powering the left side of the aircraft, and the _____ powering the right side of the aircraft and the emergency battery bus

Answer 29

Split-bus Left generator Right generator

Question 30

During normal operation with both engines running, the voltage readout on the EICAS for the Left Essential Bus reflects the voltage output of the

Answer 30

Left Generator

Question 31

During normal operation with both engines running, the voltage readout on the EICAS for the Right Essential Bus reflects the voltage output of the

Answer 31

Right Generator

Question 32

During normal operation with both engines running, the voltage readout on the EICAS for the Emergency Battery Bus reflects the voltage output of the

Answer 32

Right Generator

Question 33

A green AVAIL light on the EXT PWR switch indicator, indicates

Answer 33

the GPU is providing good voltage and polarity

Question 34

The aircraft batteries require ( ) in order for the battery contactors to close on the ground

Answer 34

14 volts minimum

Question 35

Following a dual generator failure with a subsequent loss of both main aircraft batteries, what radio communications will be available?

Answer 35

All radio communications will be lost

Question 36

Following a dual generator failure with a subsequent loss of both main aircraft batteries, will an IAP be possible?

Answer 36

No, the aircraft will be unable to fly an instrument approach

Question 37

How long will the aircraft batteries last after a loss of both generators and completion of the appropriate checklist?

Answer 37

30 min (28 amp hour batteries) 50 min (38 amp hour batteries) - OURS

Question 38

How long will the emergency battery last after a loss of both generators and completion of the appropriate checklist?

Answer 38

60 minutes

Question 39

What indications will you have if the emergency battery is discharging?

Answer 39

1. Emer battery S/I will say EMER 2. White message on CWP (only white one)

Question 40

Following a single generator failure, can you select the non-essential buses back on?

Answer 40

Yes

Question 41

Following a dual generator failure, can you select any of the autoshed buses back on?

Answer 41

Yes, you can select the L and R main buses back on, but NOT the non-essential buses.