737 Ng Cvr
Could one of you immensly clever tech chaps answer a quick question that caused civil war in a recent tech refresher.
On the 737NG when is the CVR active, we have found 2 references both valid. One is "when even 115v AC is applied to the aircraft", choice B is "from engine start (due to rising oil pressure triggering the cvr switch) until 5 mins after shutdown.
Answers on a postcard please.
Many thanks in advance.
F-C