[70-80发动机CFM56-7] 细说T12传感器那些事（737NG）

飞机在地面时和起飞后五分钟，T12传感器提供风扇进气道总温度数据到 EEC。起飞五分多钟后的飞行中，EEC 使用这些计算选定的总温度:

T12 from the active EEC channel 

T12 from the standby EEC channel 

Total air temperature from ADIRU 1 

Total air temperature from ADIRU2.

    来自EEC 工作通道的 T12

    来自备用EEC 通道的 T12

    来自ADIRU 1的总空温

    来自ADIRU 2的总空温

EEC 使用总温度控制下列项目:

Engine thrust management 

Variable bleed valve (VBV )

VSVand LPTACC systems

    发动机的推力操纵

    可调放气活门VBV

    VSV（可调定子导向叶片）和 LPTACC （低压涡轮间隙主动控制）系统。

The T12 sensor is at the 2:30 position in the engine inlet cowl. The T12 sensor probe extends into the air that flows to the fan.

    T12传感器在发动机进气道整流罩2:30位置。 T12传感器探头伸出至流入风扇的空气。

    An access panel on the outer right side of the inlet cowl supplies access to the T12 sensor.

    Two electrical connectors connect the T12 sensor to the EEC. The connectors are in the inlet cow assembly. 

They let you remove and install the sensor quickly

   通过进气道整流罩右外侧上的维护盖板接近T12传感器。

   两个电插头将T12传感器连接到EEC。

   接头在进气道整流罩组件中。它们有助于快速拆卸和安装传感器。

There are two platinum elements in the sensor assembly. One element is for channel A, the other is for channel B。

The EEC supplies a constant voltage power supply to the T12 platnum sensor elements. The elements change resistance in proportion to air temperature. The output from the platinum elements goes to the EEC. The EEC measures the difference between the constant output voltage and input from the sensor. 

The EEC converts the difference into a fan inlet temperature.

     传感器组件中有二个铂金元件。一个元件用于通道A，另一个用于通道B。

    EEC 向T12铂金传感元件提供一个恒定电压电源。元件阻值变化与空气温度成正比。来自铂金元件的输出进入EEC。EEC 测定恒定输出电压和来自传感器的输入之间的差值。

    EEC将差值转换成风扇进口温度。

检查内容：A、T12 温度探头的在位状况；B、T12温度探头的裂纹状况。

检查方法：A、目视 B、目视检查标准：

A、T12 温度探头在位；

B、T12 温度探头无裂纹。

安装：

  Use a explosion proof flashlight（防爆手电筒）, STD-1081（防爆手电筒件号） to visually examine these areas:

    1) ：Make sure that the sensor receptacles and harness connectors are clean and in good condition.

   2)：Make sure that the bonding jumper [5搭接线/搭铁线/接地线/接地片], the ground lug [6接地凸耳] terminal, the washer [4接线柱、垫圈] and the nut [3螺帽] are clean and in good condition.

    3)：Make sure that the mounting surface of the T12 support bracket is clean and in good condition.

    4)：Make sure that shock mount （减震装置）surface of the sensor is clean and smooth.

    使用防爆手电筒， STD-1081目视检查如下区域:

    1)确保传感器插座和线束插头洁净且状况良好。

    2)确保搭接线[5]、接地凸耳[6]接线柱、垫圈[4]和螺帽[3]清洁并处于良好状况。

    3)确保12支架装配表面洁净且状况良好。

    4)确保传感器的减震装置表面清洁且光滑。