Hi! A non-pilot here, just trying to learn…
FDR data show that airframe deice was selected between 21:29 and 21:30. There is no comment about deicing on CVR around that time. However at 21:32, the captain states that he just did a “24-h ice protection test”, but he did not say if he left deicing on. The test is part of Colgan cruise checklist. FO confirms the test at 21:32:58 and then again as part of the checklist completion at 21:39:12. No other comments about deicing are made until “I’ve never deiced”. Does this look like a normal procedure? Should the deicing system (including the REF SPEEDS INCR switch) be operated that inconspicuously?
Now, back to lurking…