Electrical

Question 1

320 - What are the capacities of the batteries?

Answer 1

Main - 24V and 43AH
Emergency - 24V and 15AH

Question 2

Both - When the BAT switch is selected on, DC extrernal power NOT available, no engines running…

Answer 2

The DC ESS bus, the

Question 3

Both - function of the emergency battery during starts?

Answer 3

Provides positive power to protect critical items from power transient (never powers the starters).

Question 4

320? - in the ACW system how many BTC (bus tie contractors) are used?

Answer 4

2

Question 5

Both? - How is constant AC power frequency obtained?

Answer 5

From both DC busses through two static inverters

Question 6

Both - AC on the ground, engines running, DC extrernal power online what has priority over DC generators and ground power?

Answer 6

External has priority

Question 7

Both - Emergency battery “CHG” fault light means?

Answer 7

Battery overheat (automatic disconnection) or a failure of the charge contractor

Question 8

Both - When a DC starter gen is functioning as a starter how many power sources can it use?

Answer 8

The main battery or external DC power, or the main battery AND opposite DC gen if it’s operating.

Question 9

320? - Through what NH % does the starter gen operate as a gen after start?

Answer 9

61.5%

Question 10

Both - DC SVCE and UTILITY BUS SHED amber light comes on when the BPCU (??) senses an overload condition on one of the main buses and…

Answer 10

At least one UTLY BUS is disconnected from the associated main DC BUS

Question 11

Both - With no ext power, engines off and BAT Switch off, which items are powered by the DC GND HDLG BUS?

Answer 11

*Fuelling controls and indicators
*Cargo door control and indicators
*Cockpit/cabin entrance light (2 min timer)