597.Is it possible to transmit simultaneously on Passenger Address and VHF channels?

64.The water valve and the flush valve are monitored by :

63.The whole toilet system is monitored by :

62.Where is the waste quantity displayed ?

61.How many toilet service panels are fitted on the aircraft ?

60.When does the vacuum generator operate ?

59.How is the waste transported to the waste holding tank ?

58.Where does the toilet bowl rinsing water come from ?

57.After flushing at low altitude :

56.What happens when the flush switch is pressed at high altitude ?

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