Howdy folks,
Couple of thoughts - practically, I agree that every student needs to be taught specific scan patterns for different regimes of flight (inverted V for turns, etc.). I consider the concepts of primary/supporting and control/performance to be rather abstract, and the choice between the two to be a largely theoretical one. Both will work when combined with the correct scan patterns. In many ways, since the primary/supporting concept assigns the attitude indicator as primary for most
transitions, and since whenever you make any control input you are in essence transitioning from one attitude to another (even if you're only correcting, say, a 3 deg bank back to wings level), in actuality you end up relying as heavily on the attitude indicator as you would in the control/performance concept! I don't really see much of a difference between the two (just my humble opinion). I certainly would not involve most students in an overly detailed discussion of the theory behind the two patterns, as I feel it would be confusing. I do, however, think that a CFII should understand and be able to explain the two concepts as discussed in the appropriate FAA handbooks, of course. And certainly, CERTAINLY always respect an examiner's "guidance" when you start getting the impression they don't like what you're telling them - to do otherwise is checkride suicide!
FlynRyan: back to your original question. I would say that, in a partial panel situation, one of the most important details no longer provided by the attitude indicator is when the aircraft is at level pitch. If you use the fact that pitch is very close to level when the VSI and ASI needles reverse direction (e.g. say you're in a nose-low attitude with airspeed increasing - if you pitch up, the moment the needle reverses direction and airspeed starts decreasing again will be almost exactly level pitch), then you could say that those instruments are control intsruments since they are what you directly look at when you are pitching. Likewise, since you will look at the turn coordinator when establishing a bank for a turn (even though you don't know exactly what bank angle you're using) or when keeping the wings level, you could say the turn coordinator is also a control instrument in this case. Pretty fuzzy, I know, and not out of the IFH, but if it's where you look when you deflect the controls to see how much/long you should deflect them, seems to me like it's a control instrument.
Anyway, those are my thoughts. I've had some success getting students with poor instrument skills to improve, but still have a long way to go before I really master how to effectively teach this stuff.
And wow, that post got long....
