Narrative:

During descent to 12000' MSL while setting up for landing at cos, received WX report that indicated significant wind gusts and turbulence throughout the approach and landing phase. While briefing with the first officer concerning our plan for the landing I allowed the aircraft to descend to 11500' MSL. While correcting back to 12000' MSL we received clearance to descend to 8000' MSL. A simple distraction from me attention to the level off altitude resulted in this altitude excursion. For your data base, I have just left the widebody transport glass cockpit and was flying an medium large transport that was one of the very few aircraft that our company owns that has the old autoplt with no altitude capture mode. Much has been written about the difficult transition to the glass cockpit, but I believe my transition from the glass cockpit back to a conventional cockpit was much more difficult. The glass cockpit has a tendency to create autoplt and autothrottle invalids, a potentially dangerous situation.

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Original NASA ASRS Text

Title: FLC OF MLG ON APCH TO COS IN TURBULENCE AND WINDSHEAR HAD ALT DEVIATION. CAPT FROM RECENT TRAINING IN GLASS COCKPIT WDB.

Narrative: DURING DSNT TO 12000' MSL WHILE SETTING UP FOR LNDG AT COS, RECEIVED WX RPT THAT INDICATED SIGNIFICANT WIND GUSTS AND TURB THROUGHOUT THE APCH AND LNDG PHASE. WHILE BRIEFING WITH THE F/O CONCERNING OUR PLAN FOR THE LNDG I ALLOWED THE ACFT TO DSND TO 11500' MSL. WHILE CORRECTING BACK TO 12000' MSL WE RECEIVED CLRNC TO DSND TO 8000' MSL. A SIMPLE DISTR FROM ME ATTN TO THE LEVEL OFF ALT RESULTED IN THIS ALT EXCURSION. FOR YOUR DATA BASE, I HAVE JUST L THE WDB GLASS COCKPIT AND WAS FLYING AN MLG THAT WAS ONE OF THE VERY FEW ACFT THAT OUR COMPANY OWNS THAT HAS THE OLD AUTOPLT WITH NO ALT CAPTURE MODE. MUCH HAS BEEN WRITTEN ABOUT THE DIFFICULT TRANSITION TO THE GLASS COCKPIT, BUT I BELIEVE MY TRANSITION FROM THE GLASS COCKPIT BACK TO A CONVENTIONAL COCKPIT WAS MUCH MORE DIFFICULT. THE GLASS COCKPIT HAS A TENDENCY TO CREATE AUTOPLT AND AUTOTHROTTLE INVALIDS, A POTENTIALLY DANGEROUS SITUATION.

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.