11月22日航后机组反映B26xx飞机VHF-COMM-2既不能发射,也不能接收。下面是VHF-COMM-2原理图:
•根据FIM23-12 TASK816可知,可能的原因为: •(1) VHF communication transceiver, M150 (VHF-2) •(2) Radio tuning panels (RTP): P8-71 (RTP-1), P8-72 (RTP-2), or P8-73 (RTP-3) •(3) Audio control panel, P8-6 (captain), P8-7 (first officer) or P5-15 (first observer) •(4) Remote electronics unit, M1353 •(5)VHFcommunicationantennaM58(VHF2) 22日航后分别对ACP,RTP,VHF-COMM-2收发机,VHF-COMM-2天线,REU进行了隔离,确认故障不是上述部件引起。23日白班继续排故,故障原因基本上锁定为:1. RF 同轴电缆故障;2.其它线路问题。我们先隔离RF 同轴电缆。 •下面是SSM23-12-11中VHF-COMM-2收发机与VHF-COMM-2天线的信号连接图:
下面是从天线到收发机的WDM |