LR45 ELECTRICAL SYSTEM CAS (12/13/2023)

Question 1

L BATT OVHT
R BATT OVHT
(RED)

Answer 1

Battery internal temperature > 70 C; both should autoshed to OFF (Ni-Cad only)

Question 2

L R GEN FAIL (RED)

Answer 2

COLLECTOR MESSAGE
Both engine generators off line; NON-ESS and MAIN busses autoshed

Depressing and holding the GEN switch longer than 1 second or multiple activations may cause damage to the electrical system.

RMU fuel quantity indicates left and right wing fuel only. Fuselage fuel is not indicated.

Question 3

L BATT OVHT
R BATT OVHT
LR BATT OVHT
(AMBER)

Answer 3

Battery overheat > 60C (Ni-Cad only)

Question 4

EMER BATT LOW (AMBER)

Answer 4

EMER batt taking excessive charge (> 10 amps); temporarily suppressed after engine start

The EMER BATT LOW illumination may occur after any use of the emergency battery (e.g., Engine Airstart)

Question 5

EMER BUS VOLTS (AMBER)

Answer 5

EMER bus volts < 22 or > 29.5 VDC

Normal landing gear control will be inoperative if you lose EMER BATT
Inboard brakes will be inoperative if you lose EMER BATT

Question 6

L ESS BUS FAULT
R ESS BUS FAULT
(AMBER)

Answer 6

The respective ESS bus contactor has failed open on the ground

This is the contactor that connects the L or R GEN bus to the L or R ESS bus. There is no manual control for this contactor.

Question 7

L ESS BUS VOLTS
R ESS BUS VOLTS
(AMBER)

Answer 7

ESS bus volts < 22 or > 29.5 VDC; temporarily suppressed during engine start

Question 8

L GEN AMPS HIGH
R GEN AMPS HIGH
LR GEN AMPS HIGH
(AMBER)

Answer 8

Gen amps > 300 ground & in flight; inhibited during cross gen start and temporarily suppressed after engine start

Question 9

L GEN FAIL
R GEN FAIL
(AMBER)

Answer 9

Left or right generator off-line; NON-ESS bus will depower

Question 10

BUS TIE CLSD (WHITE)

Answer 10

BUS TIE switch is closed (auto or manual): white bar on BUS TIE S/I

Question 11

BUS TIE MANUAL (WHITE)

Answer 11

BUS TIE switch is closed or opened manually by pilot; auto operation inhibited

The MAN light on top of the bus tie illuminates.

Question 12

L ESS BUS FAULT
R ESS BUS FAULT
(WHITE)

Answer 12

The respective ESS bus contactor has failed open in flight

This is the contactor that connects the L or R GEN bus to the L or R ESS bus. There is no manual control for this contactor.

Question 13

EXTERNAL POWER (WHITE)

Answer 13

External power source connected to aircraft

The external power source is connected to the aircraft (regardless of whether it is powering the aircraft).