<< >> NASA ASRS Report 527790, October 2001

During turbulence and WX avoidance in a very light aircraft whose climb performance was better than usual an air carrier crew overshoot the assigned altitude.

Attributes
ACN	527790
Time
Date	200110
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl bound lower : 13000 msl bound upper : 13700
Environment
Flight Conditions	Marginal
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 170 flight time total : 13000 flight time type : 1500
ASRS Report	527790
Events
Anomaly	altitude deviation : overshoot inflight encounter : turbulence inflight encounter : weather non adherence : clearance
Resolutory Action	flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance Weather
Primary Problem	Flight Crew Human Performance

Narrative:

On departure from ord there was extensive WX thunderstorms. We initially deviated due east for buildups. ATC asked us to turn north when able. We were circumnavigating between two cells in a turn from 090 degree heading to approximately 045 degree heading. We slowed airspeed to 250 KTS in climb, best vb for turbulence. The aircraft was climbing rapidly due to light aircraft weight. We climbed thru our cleared altitude, due to rapid climb 6000 ft per min. Assigned altitude was 13000 ft. I realized climbing thru 13400 ft and corrected immediately, but reached 13700 before descending back to 13000. In the future I will still try to accommodate ATC best as I can, but will better verbalize our flight conditions and pay closer attention to ATC clearance.

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Original NASA ASRS Text

Title: DURING TURB AND WX AVOIDANCE IN A VERY LIGHT ACFT WHOSE CLB PERFORMANCE WAS BETTER THAN USUAL AN ACR CREW OVERSHOOT THE ASSIGNED ALT.

Narrative: ON DEP FROM ORD THERE WAS EXTENSIVE WX THUNDERSTORMS. WE INITIALLY DEVIATED DUE E FOR BUILDUPS. ATC ASKED US TO TURN N WHEN ABLE. WE WERE CIRCUMNAVIGATING BETWEEN TWO CELLS IN A TURN FROM 090 DEG HDG TO APPROX 045 DEG HDG. WE SLOWED AIRSPEED TO 250 KTS IN CLB, BEST VB FOR TURB. THE ACFT WAS CLBING RAPIDLY DUE TO LIGHT ACFT WEIGHT. WE CLBED THRU OUR CLRED ALT, DUE TO RAPID CLB 6000 FT PER MIN. ASSIGNED ALT WAS 13000 FT. I REALIZED CLBING THRU 13400 FT AND CORRECTED IMMEDIATELY, BUT REACHED 13700 BEFORE DSNDING BACK TO 13000. IN THE FUTURE I WILL STILL TRY TO ACCOMMODATE ATC BEST AS I CAN, BUT WILL BETTER VERBALIZE OUR FLT CONDITIONS AND PAY CLOSER ATTENTION TO ATC CLRNC.

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.