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APU Study I

APU Study- APU Run Numbers

QuestionAnswer
6 Seconds- ADG couple to APU @ Temperatures above 30 degrees
15 Seconds- Nominal Start Time (run light at 95% rpm)
20 Seconds- ADG couple to APU @ temperatures below 30 degrees
30 Seconds- - APU warm up above 0 degree - Cool down after decouple - Time between Main and Reserve fire bottles
40 seconds- ECA auto shutdown if APU is below 95% rpm
90 degrees- ACL hot (monitored in LM4 on CITS)
165 degrees- Fuel hot (monitored in LM4 on CITS)
3600 to 4250 PSI- APU accumulator pressure
3900 to 4150 PSI Hydraulic system pressure
290 degrees- Oil hot, ADS light comes on
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