jrh said:
I guess my nerdiness is my downfall! I always thought the primary/supporting method was easier to learn.
I'm not sure why, but for me it seems that the primary/supporting method works better in lighter aircraft and the control/performance method works better for heavier, faster aircraft.
I did my instrument rating in a C-152. In that light of a plane it doesn't always make sense how you can point the nose up and keep descending or point the nose down and keep climbing, depending on updrafts and downdrafts. When I started shooting approaches in a Twin Commanche during my multi training I finally saw how the control/performance method works. If I pointed the nose down, I went down, if I pointed the nose up, I went up, no matter what.
Anybody else notice this difference?
Not really. P/S and C/P are really just two different teaching techniques with the same goal. FWIW, this is from my personal FAQ file:
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Although, like pitch vs power, crab & kick vs slip, etc, each method tends to have its own adherents, in some cases religious zealots. But they're really just two approaches to teaching instrument flight.
Primary/Secondary, which was the only approved FAA method for years, focuses on which instrument provides the most pertinent information for a given flight condition. So, for example, in straight and level flight
o the DG is primary for bank because if the DG isn't moving, you aren't turning
the altimeter is primary for pitch because if the ALT isn't changing, you are level
o the AI isn't primary for, say, pitch because, while it may be a direct indication of attitude, level on the AI doesn't necessarily mean level in reality (low power and level AI usually means a descent)
o the other instruments that indicate bank (AI, TC) and pitch (AI, VSI, ASI) are secondary - they back up the primary instruments.
Control/Performance, which has been used just about forever in military flight training, focuses on how we actually control the airplane (=both= VFR and IFR) - by selecting an attitude (control) and then confirming that the airplane is behaving as we expect it to (performance). So, in almost all flight conditions, the AI is the control instrument for our position (level, climb, descent, turn....). The other instruments tell us if what we're reading on the AI is correct. (Of course, those "other instruments" tend to be the "primary instruments" of P/S)
IMO, P/S's strength is a focus no understanding of how the each instrument works and how they work together. P/S's primary weakness (in addition to being harder for most to understand) is that is's a bit more theoretical and doesn't really reflect how we actually fly the airplane. C/P's strength is that it reflects how we actually fly the airplane. It molds theory to fit practice rather than the other way around. It's primary weakness is that it's not very specific about how to control the airplane when the control instrument is gone (partial panel).
But, as simply two ways of approaching the subject, the quality is more in the instruction than the choice of technique
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