Narrative:

During climb out, captain hand-flying the B727. We overshot our assigned altitude of 10000 ft MSL. Proper altitude verification and warning procedures were used by both pilots. Our altitude reached 10400 ft MSL when the captain and I noticed the deviation. The captain made an immediate and aggressive correction back to 10000 ft MSL. As the captain was making the correction, den approach control radioed us to 'maintain 10000 ft,' we replied that we were 'leveling at 10000 ft.' no other observed traffic in the area and den approach did not have to adjust any other aircraft's flight path. The entire deviation lasted less than 30 seconds. The factors that could have contributed to this deviation were: a busy radio frequency (morning launch out of den), departing into a rising sun in the east, and a momentary lapse of attention by the crew.

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Original NASA ASRS Text

Title: AN ACR B727 FLC OVERSHOT THEIR ALT ON CLBOUT THEN RETURNED TO THEIR ASSIGNED ALT.

Narrative: DURING CLBOUT, CAPT HAND-FLYING THE B727. WE OVERSHOT OUR ASSIGNED ALT OF 10000 FT MSL. PROPER ALT VERIFICATION AND WARNING PROCS WERE USED BY BOTH PLTS. OUR ALT REACHED 10400 FT MSL WHEN THE CAPT AND I NOTICED THE DEV. THE CAPT MADE AN IMMEDIATE AND AGGRESSIVE CORRECTION BACK TO 10000 FT MSL. AS THE CAPT WAS MAKING THE CORRECTION, DEN APCH CTL RADIOED US TO 'MAINTAIN 10000 FT,' WE REPLIED THAT WE WERE 'LEVELING AT 10000 FT.' NO OTHER OBSERVED TFC IN THE AREA AND DEN APCH DID NOT HAVE TO ADJUST ANY OTHER ACFT'S FLT PATH. THE ENTIRE DEV LASTED LESS THAN 30 SECONDS. THE FACTORS THAT COULD HAVE CONTRIBUTED TO THIS DEV WERE: A BUSY RADIO FREQ (MORNING LAUNCH OUT OF DEN), DEPARTING INTO A RISING SUN IN THE E, AND A MOMENTARY LAPSE OF ATTN BY THE CREW.

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.