drw4338 Posted October 29, 2009 Share Posted October 29, 2009 Say, I had an instructor ask me an interesting question and was wondering if anyone knew what he was talking about. I am a prior engine troop, which is why he asked the question in the first place, but honestly i'm not sure what he is talking about. He asked if i knew what the engine lighthouse pressure was. Does anyone know what this is? Quote Link to comment Share on other sites More sharing options...
drw4338 Posted October 29, 2009 Author Share Posted October 29, 2009 For those who viewed this post, I was able to get an answer to the question I asked. I thought I would post the answer incase anyone was curious. According to the Rolls Royce Manual, the inner combustion liner/lighthouse is vented to the atmosphere. Quote Link to comment Share on other sites More sharing options...
Nc97 Posted October 29, 2009 Share Posted October 29, 2009 So, let's say about 14.92 inhg give or take, depending on your location, etc... Quote Link to comment Share on other sites More sharing options...
Ronc Posted October 29, 2009 Share Posted October 29, 2009 There is a limit to this pressure and it's not standard day the labyrinth seals are allowed a certain amount of leakage (Sorry can't remember the amount CRS and many beers) I will attempt to locate the number. Anyone with maintenance manuals if you look under the section dealing with oil dumping it should describe the procedures and state the limitations Quote Link to comment Share on other sites More sharing options...
bischoffm Posted October 30, 2009 Share Posted October 30, 2009 Here is a picture of the airflow schematic. Hope it can be read!! Quote Link to comment Share on other sites More sharing options...
pjvr99 Posted October 30, 2009 Share Posted October 30, 2009 Lighthouse pressure not exceed 11"Hg a - may lead to oil dumping in flight, high oil temperatures T.O. 2J-T56-56 SWP 058 01 Table 3 Inner combustion casing pressure (diffuser vent) - Acceptable pressure above ambient as measured at the diffuser vent during all periods of stabilized operation is 11 inch Hg. for -15 and 6.0"Hg. for -7B - Rear compressor and front turbine bearing seal areas. Quote Link to comment Share on other sites More sharing options...
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