Narrative:

I had filed an instrument flight plan from kday to kpit at 5000 ft MSL. Approaching the pit TCA I was instructed by center to climb to 6000. Tops were about 5000. I had tuned and recorded ATIS information. The ceiling was measured 1000 overcast, visibility 7. Next ATIS information raised the ceiling to measured 1100 overcast, visibility remained the same. Pit approach advised me to expect vectors for runway 10R. I was instructed to descend to 5000 and additional vectors were given. As I approached the final approach course, I was instructed 'keep your speed up to 140 until the marker, cleared for the ILS 10R approach, maintain 5000 until established, contact tower on 119.9.' the frequency was very congested and I was unable to confirm if my altitude was 4000 or 5000. I believed it to be 4000 and started down. While adjusting my speed to 140, changing to tower, and trying to confirm my altitude, I flew through the final approach course. At this point, a hole in the clouds appeared and I saw an air carrier medium large transport at about my 1 O'clock position at about 1/2 to 3/4 mi and about 300 ft below me. I believe my altitude was about 4300 MSL and my heading about 070. I realized I had passed my final approach course and started a steep right turn to heading 110. I checked the HSI and it was off to the right but it was not pegged. I didn't realize the turn had given me vertigo and when I looked back at the attitude indicator the airplane was 10-20 degrees nose down and in a 45-60 degree right turn. The vsi read down 2000 FPM. I was at 3500 MSL before I recovered and then climbed back to 4300. I was at 4300 and about heading 340 when the tower said 'small aircraft X are you on frequency?' I responded that I was, and he said my clearance was maintain 5000 until established. I responded, 'I had a little problem there for a min.' tower said 'fly heading 270, maintain 4000, contact approach on XXX.X. I contacted approach and flew an uneventful approach to 10R. My instrument time is about, actual: 22.1, simulated (hood): 55.0, simulator: 36.2, total 113.3. I believe the problem arose because of the 'keep your speed up' instruction. It came at the very time that I wanted to slow the airplane. My attention was diverted while I attempted to sort priorities. I have never received any instruction in maintaining a min speed on approach. It was 1 more ball juggle and I believe it caused me to drop the inbound heading ball. I believe it should be 1 of the required maneuvers which have to be demonstrated on the instrument flight test.

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Original NASA ASRS Text

Title: POTENTIAL CONFLICT OCCURS WHEN SMA PVT PLT GETS VERTIGO AND EXPERIENCES A HDG TRACK ALTDEV ALT EXCURSION IN A NON ADHERENCE TO AN ATC CLRNC INSTRUCTION.

Narrative: I HAD FILED AN INST FLT PLAN FROM KDAY TO KPIT AT 5000 FT MSL. APCHING THE PIT TCA I WAS INSTRUCTED BY CTR TO CLB TO 6000. TOPS WERE ABOUT 5000. I HAD TUNED AND RECORDED ATIS INFO. THE CEILING WAS MEASURED 1000 OVCST, VISIBILITY 7. NEXT ATIS INFO RAISED THE CEILING TO MEASURED 1100 OVCST, VISIBILITY REMAINED THE SAME. PIT APCH ADVISED ME TO EXPECT VECTORS FOR RWY 10R. I WAS INSTRUCTED TO DSND TO 5000 AND ADDITIONAL VECTORS WERE GIVEN. AS I APCHED THE FINAL APCH COURSE, I WAS INSTRUCTED 'KEEP YOUR SPD UP TO 140 UNTIL THE MARKER, CLRED FOR THE ILS 10R APCH, MAINTAIN 5000 UNTIL ESTABLISHED, CONTACT TWR ON 119.9.' THE FREQ WAS VERY CONGESTED AND I WAS UNABLE TO CONFIRM IF MY ALT WAS 4000 OR 5000. I BELIEVED IT TO BE 4000 AND STARTED DOWN. WHILE ADJUSTING MY SPD TO 140, CHANGING TO TWR, AND TRYING TO CONFIRM MY ALT, I FLEW THROUGH THE FINAL APCH COURSE. AT THIS POINT, A HOLE IN THE CLOUDS APPEARED AND I SAW AN ACR MLG AT ABOUT MY 1 O'CLOCK POS AT ABOUT 1/2 TO 3/4 MI AND ABOUT 300 FT BELOW ME. I BELIEVE MY ALT WAS ABOUT 4300 MSL AND MY HDG ABOUT 070. I REALIZED I HAD PASSED MY FINAL APCH COURSE AND STARTED A STEEP R TURN TO HDG 110. I CHKED THE HSI AND IT WAS OFF TO THE R BUT IT WAS NOT PEGGED. I DIDN'T REALIZE THE TURN HAD GIVEN ME VERTIGO AND WHEN I LOOKED BACK AT THE ATTITUDE INDICATOR THE AIRPLANE WAS 10-20 DEGS NOSE DOWN AND IN A 45-60 DEG R TURN. THE VSI READ DOWN 2000 FPM. I WAS AT 3500 MSL BEFORE I RECOVERED AND THEN CLBED BACK TO 4300. I WAS AT 4300 AND ABOUT HDG 340 WHEN THE TWR SAID 'SMA X ARE YOU ON FREQ?' I RESPONDED THAT I WAS, AND HE SAID MY CLRNC WAS MAINTAIN 5000 UNTIL ESTABLISHED. I RESPONDED, 'I HAD A LITTLE PROB THERE FOR A MIN.' TWR SAID 'FLY HDG 270, MAINTAIN 4000, CONTACT APCH ON XXX.X. I CONTACTED APCH AND FLEW AN UNEVENTFUL APCH TO 10R. MY INST TIME IS ABOUT, ACTUAL: 22.1, SIMULATED (HOOD): 55.0, SIMULATOR: 36.2, TOTAL 113.3. I BELIEVE THE PROB AROSE BECAUSE OF THE 'KEEP YOUR SPD UP' INSTRUCTION. IT CAME AT THE VERY TIME THAT I WANTED TO SLOW THE AIRPLANE. MY ATTN WAS DIVERTED WHILE I ATTEMPTED TO SORT PRIORITIES. I HAVE NEVER RECEIVED ANY INSTRUCTION IN MAINTAINING A MIN SPD ON APCH. IT WAS 1 MORE BALL JUGGLE AND I BELIEVE IT CAUSED ME TO DROP THE INBOUND HDG BALL. I BELIEVE IT SHOULD BE 1 OF THE REQUIRED MANEUVERS WHICH HAVE TO BE DEMONSTRATED ON THE INST FLT TEST.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.