某型直升机滑油压力表指示误差的诊断与排除

Oil pressure indicator misdirection diagnosis and removal of a helicopter

滑油压力是飞机润滑系统工作状态的重要参数。针对某型直升机换装新型飞参信号适配器后出现机上减速器滑油压力表数值显示偏大的故障,从系统内部结构原理出发,综合现代电路测试技术和正确的分析思路,指出故障现象是由内部运算放大电路设计缺陷导致过压损坏引起的。经过机理分析、故障复现与确认后,参考相关电路设计文献后对运算放大电路重新进行了设计,并进行了实验及实装可靠性验证,排除了故障现象,避免了盲目的分解检查,确保了飞行安全。

Oil pressure is a valuable parameter indicating condition of aircraft lubrication system problem of reducer oil pressure indicator’s value is larger was proposed after installating a new flight data signal adapter and it was pointed out that it was caused by design detect of internal amplifier circuit which leaded to overvoltage damage.The conclusion was made from internal system structure theory,combining modern electronic testing technology and correct analysis method.Fault phenomenon was removed by redesign of amplifier circuit after mechanism analysis,fault reproduction and validation,refering to relevant literature on the circuit design and experimental and mounting reliability verification.Blind decomposition inspection was avoided,and flying safety was guaranteed.