Embeded in the software but not explained in the fcom regarding vnav mode.
At a frequency of 12.3 x 3(as a derivative of tas) the vnav function of the afcs shall command a random act of utter bollox.
The following actions are required ; Pf- put down crossword and utter "wtf is it doing that for? "
Pnf- call "hmm,, on the scarebus we used to etc etc,,"
Pf- "Flch!"
pnf-"Check"
Pf-(Capt) "Three letters, the cat sat on this, middle letter A ??"