Narrative:

The captain was flying our first flight of the day in a B737- 200. We don't fly the B737-200's very often in the phx domicile, so we are pretty used to the B737-300 FMC and autoplt. We both heard the altitude alerter, but it was the alert after passing 26000 ft, not the 1000 ft before altitude alert, so by the time we noticed and stopped the climb we were already 500 ft above our altitude. Apparently the altitude alerter was not functioning properly and our inattn to the correct altitude caused the deviation. We sometimes get too used to the B737-300 FMC where it levels off at the correct altitude for us.

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Original NASA ASRS Text

Title: B737-200 CREW OVERSHOT ASSIGNED ALT DURING CLB.

Narrative: THE CAPT WAS FLYING OUR FIRST FLT OF THE DAY IN A B737- 200. WE DON'T FLY THE B737-200'S VERY OFTEN IN THE PHX DOMICILE, SO WE ARE PRETTY USED TO THE B737-300 FMC AND AUTOPLT. WE BOTH HEARD THE ALT ALERTER, BUT IT WAS THE ALERT AFTER PASSING 26000 FT, NOT THE 1000 FT BEFORE ALT ALERT, SO BY THE TIME WE NOTICED AND STOPPED THE CLB WE WERE ALREADY 500 FT ABOVE OUR ALT. APPARENTLY THE ALT ALERTER WAS NOT FUNCTIONING PROPERLY AND OUR INATTN TO THE CORRECT ALT CAUSED THE DEV. WE SOMETIMES GET TOO USED TO THE B737-300 FMC WHERE IT LEVELS OFF AT THE CORRECT ALT FOR US.

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.