关于737NG的PSEU的FTD-32-07004

n901193 · 发表于 2010-2-10 16:16:10

The S1147 switch was added recently to the fwd entry door. Due to reports that indication and FWD entry door status did not agree, the S1147 switch was added and positioned on the aft side of the fwd entry door . This switch ensures the door is appropriately latched
During Self Test or Replacement Test, the PSEU checks D10988 pin 20 for power, to check the wiring to the light. If the door is open, the new switch causes a short to ground at D10988 pin 20. As a result, performing either the PSEU Self Test or the Replacement Test with the door open will cause a fault condition, and Fault 52-76015 will be recorded. This fault is a no Dispatch fault.
The AMM had been provided clarification of this effect in the 10 June 2007 revision, and indicated that to perform either the Self Test or the Replacement Test of the PSEU, the FWD entry door must be closed. In addition, troubleshooting had been clarified in the FIM in the October 2007 revision, to address PSEU fault 52-76015 as a result of the PSEU test.
Operator Action
Ensure that the FWD entry door is closed prior to performing either the PSEU Self Test or the Replacement Test.
因737NG飞机有时反映前登机门与指示不一致，所以有些构型的飞机在前登机门后侧加装了S1147电门，该电门确保前登机门能正确关好。
由于该电门的存在，当工作者进行PSEU更换测试或自检时，PSEU检查D10988 pin 20到指示灯的连接线路。但如果前登机门打开的情况下，该S1147将导致D10988 pin 20对地短路，从而导致PSEU测试或自检时出现不能放行飞机的52-76015故障信息。BOEING已在2007-6-10对AMM进行改版说明：执行PSEU自检或更换测试时，前登机门必须关闭。另外，在2007-10也对FIM添加了该52-76015故障信息的排故说明。
在此我们提示工作者，当737NG飞机前登机门如装有S1147电门时，进行PSEU自检或更换测试前，必须确保前登机门在关闭状态。