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单选题
FAILURE OF A DRAIN MAST HEATER OR CONTROL UNIT IS INDICATE
A
By an ECAM message.
B
On the Forward Attendant Panel (FAP).
C
By a red warning light in the cockpit.
答案解析
正确答案：B
解析：
题目解析
FAILURE OF A DRAIN MAST HEATER OR CONTROL UNIT IS INDICATED ON THE Forward Attendant Panel (FAP)（故障排水杆加热器或控制单元的故障会在机组前服务员面板（FAP）上显示，B选项）。这意味着机组前服务员面板上会有相应的指示来显示排水杆加热器或控制单元的故障情况。
