Narrative:

Front passing through area and approach vectoring me to final, 1ST try controller said he could do better and took me out again and directed me to turn left then said no turn right and vectored me to approach course at 2000' intercepted inbound just prior to eltro intersection and cleared me for approach set up descent and leveled off at 750' checked DME, showed 17.2 DME, missed approach point at 18 DME, looked again still showing 17? Looked for airport could not find looked at DME again and realized it was still reading 17.2 and I must have flown through missed approach point. Added power and started climb, it was very turbulent and had trouble keeping plane level, contacted approach, wrong frequency, changed to right one, still having trouble keeping on course and went 400' above assigned altitude and missed approach was a mess. I don't have any explanation for DME and I was depending on it for the missed approach point. WX report was within limits when I was issued the clearance but was below limits when I arrived and it would seem that with the turbulence I had a hard time keeping the plane level and on course and following instructions. My 2 passengers did not really like the bouncing around and my wife who was one of them said she nearly got sick. After things settled down I asked for and received a clearance to modesto, VOR approach runway 28R. Everything went smooth and was an ideal approach. The first approach wasn't good from the start, the WX was terrible and I did a very poor job of flying the plane in turbulence. The VOR needle was centered and the decision height was okay but I did not grasp the DME problem as soon as I should have and I was so busy flying the airplane that I fouled up the missed approach completely and can blame no one but myself. The airplane involved is a type and I have over 800 hours in it and have shot dozens of approachs with no problems prior to this.

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Original NASA ASRS Text

Title: GA-SMA HAD DME PROBLEM DURING VOR APCH TO 027. ALT DEVIATE OVERSHOT DURING GO AROUND.

Narrative: FRONT PASSING THROUGH AREA AND APCH VECTORING ME TO FINAL, 1ST TRY CTLR SAID HE COULD DO BETTER AND TOOK ME OUT AGAIN AND DIRECTED ME TO TURN LEFT THEN SAID NO TURN RIGHT AND VECTORED ME TO APCH COURSE AT 2000' INTERCEPTED INBND JUST PRIOR TO ELTRO INTXN AND CLRED ME FOR APCH SET UP DSCNT AND LEVELED OFF AT 750' CHKED DME, SHOWED 17.2 DME, MISSED APCH POINT AT 18 DME, LOOKED AGAIN STILL SHOWING 17? LOOKED FOR ARPT COULD NOT FIND LOOKED AT DME AGAIN AND REALIZED IT WAS STILL READING 17.2 AND I MUST HAVE FLOWN THROUGH MISSED APCH POINT. ADDED PWR AND STARTED CLB, IT WAS VERY TURBULENT AND HAD TROUBLE KEEPING PLANE LEVEL, CONTACTED APCH, WRONG FREQ, CHANGED TO RIGHT ONE, STILL HAVING TROUBLE KEEPING ON COURSE AND WENT 400' ABOVE ASSIGNED ALT AND MISSED APCH WAS A MESS. I DON'T HAVE ANY EXPLANATION FOR DME AND I WAS DEPENDING ON IT FOR THE MISSED APCH POINT. WX RPT WAS WITHIN LIMITS WHEN I WAS ISSUED THE CLRNC BUT WAS BELOW LIMITS WHEN I ARRIVED AND IT WOULD SEEM THAT WITH THE TURB I HAD A HARD TIME KEEPING THE PLANE LEVEL AND ON COURSE AND FOLLOWING INSTRUCTIONS. MY 2 PAXS DID NOT REALLY LIKE THE BOUNCING AROUND AND MY WIFE WHO WAS ONE OF THEM SAID SHE NEARLY GOT SICK. AFTER THINGS SETTLED DOWN I ASKED FOR AND RECEIVED A CLRNC TO MODESTO, VOR APCH RWY 28R. EVERYTHING WENT SMOOTH AND WAS AN IDEAL APCH. THE FIRST APCH WASN'T GOOD FROM THE START, THE WX WAS TERRIBLE AND I DID A VERY POOR JOB OF FLYING THE PLANE IN TURB. THE VOR NEEDLE WAS CENTERED AND THE DECISION HEIGHT WAS OKAY BUT I DID NOT GRASP THE DME PROB AS SOON AS I SHOULD HAVE AND I WAS SO BUSY FLYING THE AIRPLANE THAT I FOULED UP THE MISSED APCH COMPLETELY AND CAN BLAME NO ONE BUT MYSELF. THE AIRPLANE INVOLVED IS A TYPE AND I HAVE OVER 800 HRS IN IT AND HAVE SHOT DOZENS OF APCHS WITH NO PROBS PRIOR TO THIS.

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.