787 SYS 2 Electrical

Question 1

What are the 6 ELEC SYS Modes of Operation

Answer 1

-Towing-towing on, BATT off. (Main and APU Batt)
-On-Ground Batt Only-Batt On only. (PWR up)
-Ground Handling-First FWD AVAIL light on. Priority over on-gnd/Batt switch doesn’t matter
-Ground Service-GROUND SERVICE switch at 1L
-External Power On-atleast 1 FWD ext PWR on with APU/ENG gens off
-In-Air RAT Only-loss of CA/FO elec PWR to flight instruments

Question 2

Main Battery provides primary/backup/and interim power to what

Answer 2

PRI:
-Airplane power up
-refueling
-towing
BACKUP:
-Electric braking
-APU START (helps APU bat)
INTERIM:
-Capts essential flt instruments until RAT

Question 3

APU battery provides power on the ground for

Answer 3

-APU start
-Nav lights during batt only towing

Question 4

RAT auto deploys for

Answer 4

-Dual Engine Failure
-All 3 HYD SYS low Press
-Loss of
—elec PWR to CA/FOs
flight instruments
—All 4 EMPs and faults to
flt cntrls during apprch
—All 4 EMPs and an EO on
Takeoff or landing

Question 5

With no other power, the MAIN BAT provides standby power for how long

Answer 5

10 mins