Plaprad Posted November 24, 2009 Share Posted November 24, 2009 On 93 and above H3's they have a reset button in the hellhole next to the crew ladder to reset the Nacelle overheat system after testing. Does anyone know the reasons behind it and why it's installed, also what would happen if it wasn't reset? Thanks. Quote Link to comment Share on other sites More sharing options...
AMPTestFE Posted November 24, 2009 Share Posted November 24, 2009 The reason for it is so that maintenance can tell if, after you come home with one shut down due to the fire light coming on, whether the light was caused by a fire loop or nacelle overheat circuit. Pretty simple, right? So if you didn't reset it during your preflight, and you were to have a fire handle light up, they wouldn't know where to start right off on their troubleshooting. Quote Link to comment Share on other sites More sharing options...
Plaprad Posted November 25, 2009 Author Share Posted November 25, 2009 So the system still works then, I was told when I was on H3's that if you forget to reset it that you won't get an indication. Quote Link to comment Share on other sites More sharing options...
AMPTestFE Posted November 25, 2009 Share Posted November 25, 2009 That's not true. The fire light will light up regardless if you've forgotten to reset. Although, I have been known to not know everything. Quote Link to comment Share on other sites More sharing options...
ezurk1 Posted December 16, 2009 Share Posted December 16, 2009 Just like to add that prior to H3 acft, overheat/fire were indicated by flashing or solid lights in the fire handles. On the '92 model H3's, it was decided to make the fire handles light up solid for either condition since ESP's are the same. However, no thought was given to maint personnel having to troubleshoot which system gave the indication. In '93that little bit bulb was added by the crew stairs to aid in troubleshooting. When you test the overheat, the bulb pops out. Push it back in, test the fire warning and it won't pop out. It has no effect on the operation of either system. Quote Link to comment Share on other sites More sharing options...
SEFEGeorge Posted December 16, 2009 Share Posted December 16, 2009 Being out of the Herc for over 25 years I may not remember everything, or there may have been changes in the systems.... But, when I was flying the fire handles were the indicators for engine fire and turbine overheat (steady or flash), and the nacelle overheat lights on the pilots instrument panel were separate. It sort of sounds like now the engine fire and nacelle overheat lights are combined. Granted the emergency procedure is the same for these 2, but... Quote Link to comment Share on other sites More sharing options...
AMPTestFE Posted December 17, 2009 Share Posted December 17, 2009 I thought that on the '92 models, the overheat indicator was in the nacelle? SEFE, you're right. Nacelle overheat was an afterthought that was added in later years...not sure which model. I'm not old enough to know this, only what I was told. Quote Link to comment Share on other sites More sharing options...
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