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I had a flight today that was unsatisfactorily complete, because it was a single engine ILS and the ball on the turn coordnator wasnt was about a ball and a half off. I held the glideslope, localizer and airspeed like a champ, i guess i just left the turn coordinator out of my scan. So you mutli engine instructors out there help me, is this grounds for a unsat on a checkride, because i sure dont want to make the same mistake on the FAA ride. I think if i was the isntructor i would have completed it with no questions, im interested to see what jet careers instructors will say.
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If you're descending on an ILS single engine, the ball isn't going to ALWAYS be displaced the same way. As you reduce power in the descent, there's less need for zero sideslip into the good engine, so the ball WILL not be in the same place as it would if you were on a single-engine go-around/climbout.
So freaking what if you left the ball out of your scan, the important thing is to have a good feel for the aircraft and whether it's maintaing coordinated flight. That's at a minimum. Do your best to incorporate the turn/slip indicator, but your primary reference is flying the approach on the ILS; like I said, with the reduced power, you don't have to worry about the yaw as much. If you flew the LOC/GS and kept a/s good, then you were flying acceptable correction into the good engine.
Big picture items:
1. Did you fly the plane/maintain control? Did you have adequate counter-yaw applied?
2. Was the approach within parameters?
3. Did you exercise good judgement and was the maneuver safe?
That's all that any examiner worth their salt should be looking for.,