Hello everyone, So I thought I'd test out my new camera on this lovely Saturday morning since there is hardly a cloud in the Sky and snap snap some Planes. (Apologies on the quality)
I captured this Monarch a332 just before leveling off at FL320 from Gatwick to Sanford and I noticed that "3rd trail" upon cropping. I was under the impression that there were certain rules regarding the use of the APU over certain flight levels? I've seen a few threads from Google but nothing exactly getting to my question.
Picture ->
Monarch A332 Contrails
Edit, It dose appear after looking at more pictures the 3d trail isn't visible so it was either switched off it it wasn't the APU as I was snapping away or some other momentary trail.
Thanks!