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Is the EGT decrease related to the generators cutting in or is it related to the fact that the fan is now providing enough ventilation air for the engine?

When I say cut in I mean that the engine driven generator has taken over in supplying the electrical load from the APU driven generator.

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    $\begingroup$ Which jet engine? $\endgroup$ – Koyovis Jul 2 '17 at 6:37
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    $\begingroup$ Well, the simple answer "no", since it's the rise in N2 (and therefore more air through the core) which causes the EGT to fall. Put it this way, if you remove the generators, the engine will start in exactly the same way. $\endgroup$ – Simon Jul 2 '17 at 7:19
  • $\begingroup$ @koyovis its the IAE V2527-A5 $\endgroup$ – Jai Jul 3 '17 at 7:02
  • $\begingroup$ Please confirm that you mean begin operating / engage, which is what "cut in" typically means. $\endgroup$ – ymb1 May 29 '19 at 15:18
  • $\begingroup$ @ymb1 yes when I say cut in I mean that the engine driven generator has taken over in supplying the electrical load from the APU driven generator. $\endgroup$ – Jai May 31 '19 at 11:33
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EGT on some engines is proportional to the engine developed power, cutting the generators reduces the needed power, thus reduces the EGT

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    $\begingroup$ "Cut in" means "begin operating". $\endgroup$ – ymb1 May 29 '19 at 15:19

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