Narrative:

We were assigned FL230. Passing FL210, the 2000 ft call was made. There was a collection of large thunderstorms up ahead and the focus in the cockpit turned to them. As I looked back in the aircraft to complete the leveloff, I saw we were passing FL236 and stopped the climb at FL238 before we quickly descended back to FL230. The cause of this altitude bust was lack of focus on the approaching altitude and letting the other crew members do their job while I did mine (flying the aircraft). I already had the navigator and copilot working on the problem, that was more than sufficient. ARTCC did not say anything or inquire about our altitude and the flight continued uneventfully.

Related reports:

Google
 

Original NASA ASRS Text

Title: FLC OF A MIL KC135E TANKER ON A TRAINING FLT OVERSHOT ASSIGNED ALT ON A SID DEP DUE TO DISTR OF WX AVOIDANCE. THE RPTR RETURNED TO ASSIGNED AT ONCE WITH NO MENTION FROM ARTCC RADAR CTLR OF THE MISTAKE.

Narrative: WE WERE ASSIGNED FL230. PASSING FL210, THE 2000 FT CALL WAS MADE. THERE WAS A COLLECTION OF LARGE TSTMS UP AHEAD AND THE FOCUS IN THE COCKPIT TURNED TO THEM. AS I LOOKED BACK IN THE ACFT TO COMPLETE THE LEVELOFF, I SAW WE WERE PASSING FL236 AND STOPPED THE CLB AT FL238 BEFORE WE QUICKLY DSNDED BACK TO FL230. THE CAUSE OF THIS ALT BUST WAS LACK OF FOCUS ON THE APCHING ALT AND LETTING THE OTHER CREW MEMBERS DO THEIR JOB WHILE I DID MINE (FLYING THE ACFT). I ALREADY HAD THE NAVIGATOR AND COPLT WORKING ON THE PROB, THAT WAS MORE THAN SUFFICIENT. ARTCC DID NOT SAY ANYTHING OR INQUIRE ABOUT OUR ALT AND THE FLT CONTINUED UNEVENTFULLY.

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.