2022年8月，有飞机反应航后地面检查发现FDR OFF灯不亮，与其他飞机对串FDR控制面板，对串FDR和DFDAU无效。进一步验证明确为驾驶舱灯光在暗亮位时FDR OFF灯不亮，明亮位正常亮。最终量线检查发现面板后部D483插头的PIN7与PIN19装反了，实际与WDM不一致。销钉对串后，FDR测试正常。
FDR OFF灯不亮
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分类： 他山之石
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关于货仓火警探测单环路失效MEL 26-19-01-01是否适用于单环路自发火警的情况
SR 3-5361695619
因执行O项时,单环路自发火警的表现与MEL中的不一致，就此和波音做了沟通。通过多轮的交流，波音表示放单环路，在未测试时就出现火警，是需要执行排故的。不能依据MEL保留放行。
1. HNA asks: “Whether MEL 26-19-01-01 is only applicable when there is inoperative loop in cargo compartment?”
R1) MEL 26-19-01-01 can be applied when one loop (A or B) in each cargo compartment (FWD or AFT) is inoperative, provided that the opposite loop is checked to operate normally.
2. HNA asks: “According Boeing’s response, for example, If this is the case (fire warning appears automatically when select switch is put to A and the Cargo Fire Panel TEST switch has not been pressed and held yet, but fire warning test is normal when select switch is put to B ), the plane can not be dispatched per MEL 26-19-01-01? It requires troubleshooting?”
R2) If the TEST switch has not been pressed yet (there is no test going on) and the fire warning appears, there is either a fire in one of the cargo compartments or there is an issue with the system which requires troubleshooting.