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Large transport aircraft on departure and just after leveloff, ballooned 350 ft above assigned altitude.
| Attributes | |
| ACN | 369700 |
| Time | |
| Date | 199705 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : iah |
| State Reference | TX |
| Altitude | msl bound lower : 5000 msl bound upper : 5350 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : iah |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute airway : iah |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 270 flight time total : 24000 flight time type : 16000 |
| ASRS Report | 369700 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 30300 flight time type : 20000 |
| ASRS Report | 369834 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Assigned 5000 ft on climb out by iah departure control. Leveled at 5000 ft, then experienced a 'balloon' (autoplt was off, hand flying), lifting us up about 300-350 ft. Immediately corrected back to 5000 ft. Suspect thermal updraft. Unusual there at iah, bearing in mind the WX and the time, ie, no significant unsettled activity.
Original NASA ASRS Text
Title: LGT ACFT ON DEP AND JUST AFTER LEVELOFF, BALLOONED 350 FT ABOVE ASSIGNED ALT.
Narrative: ASSIGNED 5000 FT ON CLBOUT BY IAH DEP CTL. LEVELED AT 5000 FT, THEN EXPERIENCED A 'BALLOON' (AUTOPLT WAS OFF, HAND FLYING), LIFTING US UP ABOUT 300-350 FT. IMMEDIATELY CORRECTED BACK TO 5000 FT. SUSPECT THERMAL UPDRAFT. UNUSUAL THERE AT IAH, BEARING IN MIND THE WX AND THE TIME, IE, NO SIGNIFICANT UNSETTLED ACTIVITY.
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.