Narrative:

On a scheduled flight from iad to ewr, the autoplt was on, climbing 1000 FPM with the altitude select armed for 13000 ft. My captain was telling me how he has had problems over bwi because of the difference between the moving map display and the HSI. I guess the controllers notice a big difference in deviation between the map mode and HSI. As we were discussing this, we climbed through 12000 ft, the altitude warning horn and light went off. I called 12000 ft for 13000 ft and the captain confirmed this. Since we were still talking, we did not notice that the autoplt failed to capture. At 13300 ft the altitude horn and light went off again. I immediately disengaged the autoplt and pitched down but not before we reached 13500 ft. We leveled at 13000 ft and reengaged the autoplt. ATC asked us to confirm our altitude and we said we were leveling at 13000 ft. The autoplt performed normally the rest of the flight. I guess even though we have all this fancy new equipment (CRT's, moving map, autoplt), we still need to pay close attention to simple things like leveling off.

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Original NASA ASRS Text

Title: ALT BUST.

Narrative: ON A SCHEDULED FLT FROM IAD TO EWR, THE AUTOPLT WAS ON, CLBING 1000 FPM WITH THE ALT SELECT ARMED FOR 13000 FT. MY CAPT WAS TELLING ME HOW HE HAS HAD PROBS OVER BWI BECAUSE OF THE DIFFERENCE BTWN THE MOVING MAP DISPLAY AND THE HSI. I GUESS THE CTLRS NOTICE A BIG DIFFERENCE IN DEV BTWN THE MAP MODE AND HSI. AS WE WERE DISCUSSING THIS, WE CLBED THROUGH 12000 FT, THE ALT WARNING HORN AND LIGHT WENT OFF. I CALLED 12000 FT FOR 13000 FT AND THE CAPT CONFIRMED THIS. SINCE WE WERE STILL TALKING, WE DID NOT NOTICE THAT THE AUTOPLT FAILED TO CAPTURE. AT 13300 FT THE ALT HORN AND LIGHT WENT OFF AGAIN. I IMMEDIATELY DISENGAGED THE AUTOPLT AND PITCHED DOWN BUT NOT BEFORE WE REACHED 13500 FT. WE LEVELED AT 13000 FT AND REENGAGED THE AUTOPLT. ATC ASKED US TO CONFIRM OUR ALT AND WE SAID WE WERE LEVELING AT 13000 FT. THE AUTOPLT PERFORMED NORMALLY THE REST OF THE FLT. I GUESS EVEN THOUGH WE HAVE ALL THIS FANCY NEW EQUIP (CRT'S, MOVING MAP, AUTOPLT), WE STILL NEED TO PAY CLOSE ATTN TO SIMPLE THINGS LIKE LEVELING OFF.

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.