A bit of turbulence is often good for getting them to actually move the controls without them being afraid they'll break something
Really? What a "bit of turbulence" is to the instructor can mean something else entirely to a first time TIF student.. To quote from the CASA Flight instructors Manual again: "If possible the flight should be made in good weather, as many potential pilots have been frightened away by a rough and unpleasant first flight."
Too many inexperienced instructors are keen to beat the others to pick up a TIF and if that means the weather is not suitable, then their attitude is what the hell I need to eat and a TIF student is the start regardless of the suitability of the weather. Essendon pilots may remember the grade 3 that taxied in a 30 knot wind with a TIF student while those watching from the safety of Essendon terminal building watched with great interest.
Checking the controls of the 152 at the threshold of 35 with wind gusting beyond 30 knots, when full back elevator was made the Cessna got airborne into a half loop and finished inverted on the runway. The TIF student certainly got his money's worth but whether he came back for another TIF is lost in history. The instructor told investigators he gave the choice that day to the TIF student who didn't have a clue of course about weather but who said "Let's go". So they did - with a spectacular result
