Narrative:

Impending altitude deviation. Assigned 10000 ft by ATC. Began to deviate on climb out and recovered by 10300 ft MSL. I feel this potential deviation is serious enough to write a NASA report for 2 reasons: 1) it stresses the potential pitfalls associated with being qualified in 2 types of aircraft. In our flying, we are qualified and fly both the B737-300 and B737-800 as a common category. These aircraft are substantially different in their technical interface with the pilot. The dash 800, for instance, has no reminder for approaching a selected altitude. The dash 300, however, has an aural warning 1000 ft prior to selected altitude. I had flown the dash 300 for 5 continuous trips prior to this flight. With very little experience in the dash 800, I believe I was 'geared' towards hearing that warning, and without it almost missed leveling at our assigned altitude. 2) during this flight we had an extra pilot occupying the cockpit jump seat. With 3 pilots in the cockpit, there was substantial cockpit 'chatter.' this led to both myself and the captain missing the standard 1000 ft prior to leveloff callout. This incident more than emphasized the need for strict vigilance to sterile cockpit procedures.

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Original NASA ASRS Text

Title: FO OF A B737-800 OVERSHOT INTERMEDIATE ASSIGNED ALT DURING DEP BLAMES THE ERROR ON THE ACFT MODEL WAS NOT EQUIPPED WITH AN AURAL WARNING 1000 FT PRIOR TO SELECTED ALT.

Narrative: IMPENDING ALTDEV. ASSIGNED 10000 FT BY ATC. BEGAN TO DEVIATE ON CLBOUT AND RECOVERED BY 10300 FT MSL. I FEEL THIS POTENTIAL DEV IS SERIOUS ENOUGH TO WRITE A NASA RPT FOR 2 REASONS: 1) IT STRESSES THE POTENTIAL PITFALLS ASSOCIATED WITH BEING QUALIFIED IN 2 TYPES OF ACFT. IN OUR FLYING, WE ARE QUALIFIED AND FLY BOTH THE B737-300 AND B737-800 AS A COMMON CATEGORY. THESE ACFT ARE SUBSTANTIALLY DIFFERENT IN THEIR TECHNICAL INTERFACE WITH THE PLT. THE DASH 800, FOR INSTANCE, HAS NO REMINDER FOR APCHING A SELECTED ALT. THE DASH 300, HOWEVER, HAS AN AURAL WARNING 1000 FT PRIOR TO SELECTED ALT. I HAD FLOWN THE DASH 300 FOR 5 CONTINUOUS TRIPS PRIOR TO THIS FLT. WITH VERY LITTLE EXPERIENCE IN THE DASH 800, I BELIEVE I WAS 'GEARED' TOWARDS HEARING THAT WARNING, AND WITHOUT IT ALMOST MISSED LEVELING AT OUR ASSIGNED ALT. 2) DURING THIS FLT WE HAD AN EXTRA PLT OCCUPYING THE COCKPIT JUMP SEAT. WITH 3 PLTS IN THE COCKPIT, THERE WAS SUBSTANTIAL COCKPIT 'CHATTER.' THIS LED TO BOTH MYSELF AND THE CAPT MISSING THE STANDARD 1000 FT PRIOR TO LEVELOFF CALLOUT. THIS INCIDENT MORE THAN EMPHASIZED THE NEED FOR STRICT VIGILANCE TO STERILE COCKPIT PROCS.

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.