结冰探测器
The ice detectors monitor for ice conditions and supply the information to the airfoil and cowl ice protection system (ACIPS).
结冰探测器监测结冰情况，并将信息提供给机翼和整流罩结冰保护系统（ACIPS）。
Each ice detector operates independently. The ice detector probe vibrates at approximately 40,000 Hz. The probe vibrates at a lower frequency when it collects ice. A heater for the probe turns on when the probe vibrates less than 39,867 Hz. The heater stays on until the probe vibration returns to its usual value or the heater operates for 25 seconds. The usual time that the heater is on is 5 - 7 seconds. If the heater is on for 25 seconds, the heater turns off, and a fault condition is latched.
每个结冰探测器独立工作。冰探测器探头振动约40000赫兹。当探测器收集冰时，它以较低的频率振动。当探头振动低于39867赫兹时，探头加热器打开。加热器保持打开，直到探头振动恢复到正常值或加热器工作25秒。通常加热器打开的时间是5-7秒。如果加热器打开25秒，加热器关闭，故障状态锁定。
Control logic in the detector counts the number of heater on to off cycles.
探测器中的控制逻辑计算加热器的开-关循环次数。
If there are two or more cycles, and the airplane is in the air, the ice detector gives an engine icing signal to the ACIPS. The detector also gives an engine icing signal if the airplane is in the air, and the heater is on for 15 seconds or more.
如果有两个或多个循环，并且飞机在空中，结冰探测器会向ACIP发出发动机结冰信号。如果飞机在空中，并且加热器打开15秒或更长时间，探测器还会发出发动机结冰信号。
If there are ten cycles and the airplane is in the air, the detector gives a wing icing signal to the ACIPS.
如果有10个循环，并且飞机在空中，探测器会向ACIPS发出机翼结冰信号。
The icing signals stay on until any of these conditions occur:
• No ice for more than three minutes
• The airplane is on the ground
• The heater is on for 25 seconds.
结冰信号持续亮起，直到出现以下任何情况：三分钟以上不结冰；飞机在地面上；加热器打开25秒。
The detectors have circuits that monitor operation and give a fault signal if necessary. The detectors also have BIT circuits that become active by a push-to-test (PTT) signal from the ACIPS.
探测器的电路可以监测运行情况，并在必要时发出故障信号。探测器也有位电路，通过来自ACIPS的push-to-test（PTT）信号激活。
Faults
The detectors and the EAI ACIPS control cards can find faults. If there is a fault, the ACIPS sends the fault information to AIMS. AIMS shows a status message, ICE DETECTOR L (R) for the detector that has a fault. If both detectors fail, AIMS shows an advisory message, ICE DETECTORS. AIMS also shows maintenance messages that help you isolate the fault.
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