606.What is the purpose of the static dischargers?

55.On ground, when does the vacuum generator start to operate ?

54.Why are drain valve installed in the waste water drain system ?

53.How many potable water quantity indicators are there ?

52.Where is the main drain port of the potable water system ?

51.How many potable water service and drain panels are fitted to the aircraft ?

50.Where can the potable water quantity be checked ?

49.How many valves are used during draining operation ?

48.Why is the water tank pressurized ?

47.Which condition is sufficient to close the entry corridor ?

46.With ear protection :