Narrative:

Cleared to 4000 ft after takeoff with thunderstorms in the area. I was distracted looking at the radar depiction and did not hear the 1000 ft prior to leveloff warning. The high-speed warning went off at 250 KIAS, so I pitched up to slow the aircraft. The departure controller either caught my climb past 4000 ft or coincidentally assigned 5000 ft and I leveled the aircraft at 5000 ft. My perception of the problem was inaccurate. I made a post analysis after the high speed warning and climbed instead of reducing power. I did not think we had climbed to nearly 4000 ft and took the wrong action to slow the airplane. I believe the WX was a distraction and fatigue played a part. Supplemental information from acn 495762: my captain was climbing out of 3000 ft. We were cleared to 4000 ft. All of a sudden our speed went through 250 KTS and continued up to 275 KTS. I was watching him try and slow down and as a result we went through 5000 ft, 1000 ft past our assigned altitude. ATC then told us to maintain 5000 ft. Determining factors: 4TH day of a 4 day trip, late night followed by a long day, bad WX ATC delays and captain's lack of time in the airplane as well as flying with the autoplt instead of hand-flying to rectify the situation.

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Original NASA ASRS Text

Title: AIRSPD AND ALT OVERSHOOT NEAR HOUSTON, TX.

Narrative: CLRED TO 4000 FT AFTER TKOF WITH TSTMS IN THE AREA. I WAS DISTRACTED LOOKING AT THE RADAR DEPICTION AND DID NOT HEAR THE 1000 FT PRIOR TO LEVELOFF WARNING. THE HIGH-SPD WARNING WENT OFF AT 250 KIAS, SO I PITCHED UP TO SLOW THE ACFT. THE DEP CTLR EITHER CAUGHT MY CLB PAST 4000 FT OR COINCIDENTALLY ASSIGNED 5000 FT AND I LEVELED THE ACFT AT 5000 FT. MY PERCEPTION OF THE PROB WAS INACCURATE. I MADE A POST ANALYSIS AFTER THE HIGH SPD WARNING AND CLBED INSTEAD OF REDUCING PWR. I DID NOT THINK WE HAD CLBED TO NEARLY 4000 FT AND TOOK THE WRONG ACTION TO SLOW THE AIRPLANE. I BELIEVE THE WX WAS A DISTR AND FATIGUE PLAYED A PART. SUPPLEMENTAL INFO FROM ACN 495762: MY CAPT WAS CLBING OUT OF 3000 FT. WE WERE CLRED TO 4000 FT. ALL OF A SUDDEN OUR SPD WENT THROUGH 250 KTS AND CONTINUED UP TO 275 KTS. I WAS WATCHING HIM TRY AND SLOW DOWN AND AS A RESULT WE WENT THROUGH 5000 FT, 1000 FT PAST OUR ASSIGNED ALT. ATC THEN TOLD US TO MAINTAIN 5000 FT. DETERMINING FACTORS: 4TH DAY OF A 4 DAY TRIP, LATE NIGHT FOLLOWED BY A LONG DAY, BAD WX ATC DELAYS AND CAPT'S LACK OF TIME IN THE AIRPLANE AS WELL AS FLYING WITH THE AUTOPLT INSTEAD OF HAND-FLYING TO RECTIFY THE SIT.

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.