Very often after power-up of the a/c in the morning, after a cold night, the cargo fire system test fails, and in one loop a defect detector is found. Switching the selector to the good working loop-side, allows you to dispatch the a/c iaw the MEL. But often after some flights, if you do the cargo fire test again, all detectors are ok again. This is often due to the presence of moisture / damp inside one of the detectors due to the cold and damp air. Warming up of the a/c and air inside solves the problem. But then it is not possible to find the “bad” detector again, which will certainly fail the next morning too..

The tip here is to go to the bite box inside the fwd cargo compartment ceiling,  and during the test of the detectors, the LAST light to come on for the test is often the most suspected detector. Even if the bite shows they are all ok (all lights on), replace this detector first, and probably your early morning fault will be gone, giving you more time for that wake up coffee.

冬季由于客舱温度较低，易造成厕所烟雾探测器内部形成冷凝水或冰晶，从而会导致烟雾探测器的误报警；另外由于天气寒冷原因，当乘务员在厕所喷洒杀虫剂、空气清新剂、香水时，也容易在探测器内部形成结晶，造成误报警。

若遇厕所烟雾探测器误报警且不能立即复位，可以打开空调使客舱加温，消除冷凝水或冰晶，并打开厕所门，加速悬浮物的扩散，这样可提高复位成功率。

请各维修单位在寒冷天气下完成航后工作时，将飞机上的三个厕所门锁定在开位，可减少厕所区域的空气湿度，另请各维修单位加强与机组的交流，在冬季航前时，请机组减少对厕所喷洒杀虫剂、空气清新剂、香水，以降低故障率。

JAMCO

KIDDE