CHAPTER 33

Question 1

How are the emergency lights powered?

Answer 1

The 28V DC/6V DC converters of the EPSUs supply the emergency lights as long as the 28V DC ESS SHED BUS is available. If the 28V DC SHED ESS BUS voltage falls below 16V, the EPSUs internal batteries continue to supply the loads for at least 10 minutes.

Question 2

The Landing lights are controlled by a 3 position switch ON/OFF/RETRACT. What happens if the Landing light is on and RETRACT is selected?

Answer 2

RETRACT, retracts the landing light and shuts it off.

Question 3

What signal is used from the LGCIU for the TAXI & TAKE-OFF lights?

Answer 3

Nose gear down and locked.

Question 4

What 2 signals determine the operation of the LOGO Lights?

Answer 4

If the main gear struts are compressed or the flaps are extended at least 15°. The logo lights are controlled together with the navigation lights by the NAV & LOGO SW