More Fun Scanning Broken Instruments
C172 — N9522Q — Tampa Executive Airport, FL — Hood Training, tracking VORs, ILS approach, Unusual Attitude Recovery, and more, 1 Landing — 1.4 hrs
While I'm still a low-hour rookie pilot and no one's authority, still, I'm not sure I'd just capitulate with just any instructor's method of scanning the instruments either. I mean different maneuvers have a different emphasis on certain instruments in certain phases of the maneuver. Thus it would depend. The point is to scan, check, cross-check, and not to fixate on any one instrument and neglect the others as you scan.
Even better, not fixating on any one at a time, but instead visually "sit back," zoom out, and try to see them all at a glance. Kind of a "see the WHOLE panel" drill.
I found the VSI lag is little tricky as it confuses the issue... A 6- to 9-second lag is required to equalize or stabilize the pressures of the static ports. Cool. So there's limitations in the use of the vertical-speed indicator. Sudden or abrupt changes in aircraft attitude cause wrong instrument readings as the air flow fluctuates over the static ports. Be smooth... Because rough control technique or turbulent air result in unreliable needle indications.