LR45 APU CAS (12/13/2023)

Question 1

APU FIRE (RED)

Answer 1

APU fire detected; automatic shutdown initiated and fire extinguisher activated; APU fire horn sounds

Question 2

APU AMPS HIGH (AMBER)

Answer 2

APU amps > 300 (temporarily suppressed after APU or engine start)

• If the load limit for the APU generator exceeds 550 amps, the APU AMPS digits on EICAS will become amber dashes.
• APU loads of 500 amps or above will be displayed at 500 amps.

Question 3

APU FAIL (AMBER)

Answer 3

APU fault/fail detected; APU will shutdown (or not start)

Question 4

APU AVAILABLE (WHITE)
WE DON’T HAVE THIS MESSAGE (SB 45-22-4)

Answer 4

APU is operating and available for bleed air and electrical power