Narrative:

I was transitioning wbound along the shoreline above malibu, ca, at 1500 ft past the temporary restr airspace and apparently dropped below 1500 ft while transitioning. My copilot and I were aware of the restr and were watching our altitude to maintain 1500 ft. I subsequently had my 100 hour/annual and had my altimeter checked and adjusted.

Google
 

Original NASA ASRS Text

Title: A TB20 PLT ENTERED A TEMPORARY RESTR AREA WHILE ON A PLEASURE FLT ALONG THE LAX SHORELINE. HE BLAMES HIS ALTIMETER.

Narrative: I WAS TRANSITIONING WBOUND ALONG THE SHORELINE ABOVE MALIBU, CA, AT 1500 FT PAST THE TEMPORARY RESTR AIRSPACE AND APPARENTLY DROPPED BELOW 1500 FT WHILE TRANSITIONING. MY COPLT AND I WERE AWARE OF THE RESTR AND WERE WATCHING OUR ALT TO MAINTAIN 1500 FT. I SUBSEQUENTLY HAD MY 100 HR/ANNUAL AND HAD MY ALTIMETER CHKED AND ADJUSTED.

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.