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Fire Warning Test B733/4 vs B738

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Fire Warning Test B733/4 vs B738

Old 20th May 2004, 02:28
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Question Fire Warning Test B733/4 vs B738

I have a question which is driving me nuts.

When conducting the engine/apu fire warning test on the B737-300 and 400, the fire warning lights on the glareshield and the fire warning handles on the centre pedestal illuminate together.

On the B737-800 the fire warning lights on the glareshield seem to light up approximately 1-1.5 seconds before the fire warning handles on the centre pedestal.

I know it is not much but it is definitely a noticeable difference, generally because I cancel the warning and then have to do it again when it is set off a second time by the fire warning handles.

Does anyone know the difference in the warning system that causes this?
Red Moyayo is offline  
Old 20th May 2004, 12:45
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Are you sure you're not getting the first warning on the glareshield panel from the Overheat detection, the second from the Fire detection?
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Old 22nd May 2004, 13:49
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Are you sure that an overheat will trigger the fire cue ?
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