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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, 2017 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, 2017 at 7:19
  • $\begingroup$ @koyovis its the IAE V2527-A5 $\endgroup$
    – Jai
    Jul 3, 2017 at 7:02
  • $\begingroup$ Please confirm that you mean begin operating / engage, which is what "cut in" typically means. $\endgroup$
    – user14897
    May 29, 2019 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, 2019 at 11:33

1 Answer 1

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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". $\endgroup$
    – user14897
    May 29, 2019 at 15:19

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