Narrative:

Coming back to baker city, or, from burns, or, I turned off my autoplt when I got baker's altimeter to increase altitude 100 ft. I was distraction by passenger questions of outside lights and inside panel instrument lighting was dimmed. I was 800 ft high and caught it and was correcting it just as ZLC advised me of same. I acknowledged it, descended to 10000 ft, and the controller said 'no problem.' no traffic in my area.

Google
 

Original NASA ASRS Text

Title: PVT PLT IN PVT ACFT WAS DISTR BY A PAX ASKING QUESTIONS. HE HAD DISCONNECTED HIS AUTOPLT FOR AN ALT ADJUSTMENT AND EXPERIENCED A CLB 800 FT ABOVE HIS ASSIGNED ALT. IT WAS NIGHTTIME AND THE COCKPIT LIGHTING WAS DIMMED.

Narrative: COMING BACK TO BAKER CITY, OR, FROM BURNS, OR, I TURNED OFF MY AUTOPLT WHEN I GOT BAKER'S ALTIMETER TO INCREASE ALT 100 FT. I WAS DISTR BY PAX QUESTIONS OF OUTSIDE LIGHTS AND INSIDE PANEL INST LIGHTING WAS DIMMED. I WAS 800 FT HIGH AND CAUGHT IT AND WAS CORRECTING IT JUST AS ZLC ADVISED ME OF SAME. I ACKNOWLEDGED IT, DSNDED TO 10000 FT, AND THE CTLR SAID 'NO PROB.' NO TFC IN MY AREA.

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.