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Old 05-30-2017, 11:36 PM
eschereal eschereal is online now
Join Date: Aug 2012
Location: Frogstar World B
Posts: 12,664
Originally Posted by Isilder View Post
The spirit level is in no way accurate enough to show the variation between the pitch for a very slow ascent and a very slow descent anyway.
The reality is that a cruising airplane flies with a slight positive pitch of a couple degrees or so all the time. I believe this is probably in order to offset mach tuck, which affects subsonic airplanes. The level was registered to the cruise attitude, which does not correspond to ground plumb.