FCOM - Lights

Question 1

Which two sources supply the emergency lights and how does the system work?

Answer 1

DC STBY BUS or a 6 volt battery which is charged from the DC STBY BUS. In case the DC STBY BUS becomes unavailable the 6 volt battery automatically takes over. The capacity of the 6 volt battery is 10 minutes.

Question 2

The IEP (Ice Evidence Probe) is linked to which exterior light?

Answer 2

The NAV lights controls the light in the IEP.

Question 3

Will the TAXI and T.O lights stay on if the landing gear is selected UP?

Answer 3

No, the TAXI and T.O lights will turn off regardless of the TAXI and T.O light switch position if the landing gear is selected UP.

Question 4

The EMER EXIT LT (Emergency Exit Light) switch has three positions; ON, ARM and DISARM. In the ARM position, which is the normal position during flight, how does the DC STBY BUS control the emergency lights?

Answer 4

If DC STBY BUS voltage drops below 18 volts or in case of DUAL DC GEN loss the emergency lights comes on. If the DC STBY BUS voltage is above 20 volts and at least one DC GEN is running the emergency lights turns off.

Question 5

Is it possible for the cabin crew to override the position of the EMER EXIT LT (Emergency Exit Light) switch in the cockpit?

Answer 5

Yes, via the cabin crew EMER LIGHT switch in the cabin.

Question 6

The MIN CAB LT (Minimum Cabin Light) switch ensures which lights to come on?

Answer 6

Every second light on the right hand side of the cabin comes on.