Electrical System Learjet 45XL (1/25/2024)

Question 1

The ________ electrical system is powered by _______ engine driven generators.

Answer 1

DC/two

Question 2

How many batteries does the system have?

Answer 2

Two main batteries and an emergency battery

Question 3

_______ power is provided by ______ engine driven _______________ for windshield heat.

Answer 3

AC/two/alternators

Question 4

_________ or _________ can provide power prior to engine start

Answer 4

APU/GPU

Question 5

How many generators are there and how many amps are they?

Answer 5

Left, right, and APU. 300 amps

Question 6

What happens if one Gen fails?

Answer 6

NON ESS buses are shed, can be reselected

Question 7

What happens if two Gen fail?

Answer 7

NON ESS buses and MAIN buses are shed, MAIN buses can be reselected

Question 8

What is an indication of alternator failure?

Answer 8

No windshield heat

Question 9

How many batteries are there and where are they located?

Answer 9

Two batteries, tailcone

Question 10

Describe the main batteries (type, amp/hour, power time if gens fail)

Answer 10

lead acid, 38 amp/hour, 50 minutes

Question 11

What is the minimum voltage for starting?

Answer 11

24 volts

Question 12

Batteries can be re-charged by the APU, GPU, or Gens, unless they go below what voltage?

Answer 12

14 volts

Question 13

________ _________ automatically close if a generator is lost.

Answer 13

Bus tie

Question 14

Turn on the _______________ battery approximately 10 seconds after the Main battery or the O2 masks will drop.

Answer 14

Emergency

Question 15

Describe the emergency batteries (type, amp/hour, power time if gens fail)

Answer 15

lead acid, 10 amp/hour, 60 minutes of power after dual gen failure

Question 16

Red collared CB’s are items on the _________________ _____

Answer 16

Emergency bus

Question 17

External power enters into what bus?

Answer 17

Left main bus

Question 18

Ideal GPU (volts/amps)

Answer 18

28 volts/1000-1100 amps

Question 19

Where can the GPU voltage be read?

Answer 19

EICAS

Question 20

What does the White CAS message “EXTERNAL POWER” mean?

Answer 20

It means that the GPU is connected, but does not indicate that the GPU is powering the airplane.

Question 21

What does the AVAIL annunciation on the GPU switch mean? (3 things)

Answer 21

Power is available, it is the correct polarity, voltage is not fluctuating

Question 22

Batts will charge with external power as long as ___________ switches are on

Answer 22

BATT

Question 23

What is the APU fuel flow and rpm?

Answer 23

100-150 pph/70,000

Question 24

Where does the APU power enter?

Answer 24

Right main bus

Question 25

Where are the APU intake and exhaust located?

Answer 25

Intake on the left, exhaust on right upper fuselage

Question 26

There are no indications of __________ or ________ on control panel (APU)

Answer 26

RPM/ITT

Question 27

___________ __________ sounds if shutdown occurs to alert crew

Answer 27

Ramp horn

Question 28

Weight on wheels is required for what to operate?

Answer 28

APU

Question 29

Where does the fuel come from and what is energized when the APU is running?

Answer 29

Right wing, right standby pump

Question 30

No ________ ___________ with APU running

Answer 30

gravity refuel

Question 31

What are the OAT for APU operation? (2 items)

Answer 31

With blowers, up to 125 F

Without blowers, up to 100 F

Question 32

What do the following indications mean for APU? “ADD”, “LOW”, Blue LED, Fan Fail Indication

Answer 32

10 ounces below full oil, 18.5 ounces below full oil, can run 5 hours max, possible fault or fail, no ops above 100F/38C

Question 33

What items run of the hot battery bus? (These items always have power and you need to make sure that they are switched off)

Answer 33

• Battery compartment light
• Baggage compartment light and pylon light when door is open
• Both cockpit OVRHD swivel lights
• Refueling panel digital gauge
• Oxygen test switch in external panel in nose