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While operating in congested C90 airspace and unable to obtain clearance to deviate around WX, flight crew of B735 was unable to maintain assigned altitude in rising air mass associated with thunderstorm activity.
| Attributes | |
| ACN | 585691 |
| Time | |
| Date | 200306 |
| Day | Wed |
| 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 | Mixed |
| Weather Elements | Thunderstorm |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| 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 |
| ASRS Report | 585691 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather inflight encounter : turbulence non adherence : clearance other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to assigned altitude flight crew : regained aircraft control other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | ATC Human Performance Weather Environmental Factor Airspace Structure |
| Primary Problem | Weather |
Narrative:
During vectors after departure, cumulus clouds with occasional moderate chop in climb. On initial heading of 140 degrees a cell painting solid red for about 6 mi diameter was directly ahead. A turn to 060 degrees was given along with a climb to 13000 ft. On that heading and near top of climb a request was made for a 20 degree right turn to avoid the turbulence of a buildup. The request was denied and there was no room for a left turn. We entered the top of the cloud at leveloff altitude. We immediately encountered a strong uplift. Even though the throttles were at idle we did not stop the altitude gain until 13700 ft. We confirmed with ATC that we had gone through our assigned altitude and complied with his request to return to 13000 ft as soon as it was possible.
Original NASA ASRS Text
Title: WHILE OPERATING IN CONGESTED C90 AIRSPACE AND UNABLE TO OBTAIN CLRNC TO DEVIATE AROUND WX, FLT CREW OF B735 WAS UNABLE TO MAINTAIN ASSIGNED ALT IN RISING AIR MASS ASSOCIATED WITH TSTM ACTIVITY.
Narrative: DURING VECTORS AFTER DEP, CUMULUS CLOUDS WITH OCCASIONAL MODERATE CHOP IN CLB. ON INITIAL HEADING OF 140 DEGS A CELL PAINTING SOLID RED FOR ABOUT 6 MI DIAMETER WAS DIRECTLY AHEAD. A TURN TO 060 DEGS WAS GIVEN ALONG WITH A CLB TO 13000 FT. ON THAT HEADING AND NEAR TOP OF CLB A REQUEST WAS MADE FOR A 20 DEG R TURN TO AVOID THE TURB OF A BUILDUP. THE REQUEST WAS DENIED AND THERE WAS NO ROOM FOR A L TURN. WE ENTERED THE TOP OF THE CLOUD AT LEVELOFF ALT. WE IMMEDIATELY ENCOUNTERED A STRONG UPLIFT. EVEN THOUGH THE THROTTLES WERE AT IDLE WE DID NOT STOP THE ALT GAIN UNTIL 13700 FT. WE CONFIRMED WITH ATC THAT WE HAD GONE THROUGH OUR ASSIGNED ALT AND COMPLIED WITH HIS REQUEST TO RETURN TO 13000 FT AS SOON AS IT WAS POSSIBLE.
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.