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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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A government small transport in IMC was unable to maintain 4000 ft due to severe turbulence. Aircraft climbed to 4400 ft. Departure controller assigned 6000 ft and the aircraft was able to maintain altitude in smooth air.
| Attributes | |
| ACN | 357030 |
| Time | |
| Date | 199612 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ccr airport : suu |
| State Reference | CA |
| Altitude | msl bound lower : 4000 msl bound upper : 4400 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | other |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Route In Use | enroute airway : suu |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 200 flight time total : 17000 flight time type : 400 |
| ASRS Report | 357030 |
| Person 2 | |
| Affiliation | government other |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | other |
Narrative:
Due to moderate to severe turbulence we were unable to maintain our assigned altitude of 4000 ft MSL. It was as if we were in a wave, with power back and forward yoke the aircraft climbed to 4300 ft MSL per our altimeter. ATC stated he showed us at 4400 ft MSL. Our altimeter was set to concord's current altimeter setting prior to departure. 2 mins after ATC advised us of our altitude, they gave us 6000 ft MSL as an assigned altitude and the air was smooth for the rest of our flight, no further altitude problems. We were IMC for 80% of the flight in light rain and very light rime ice. At the time the turbulence hit us we were just leveling off and was unable to correct the altitude deviation without over stressing the aircraft.
Original NASA ASRS Text
Title: A GOV SMT IN IMC WAS UNABLE TO MAINTAIN 4000 FT DUE TO SEVERE TURB. ACFT CLBED TO 4400 FT. DEP CTLR ASSIGNED 6000 FT AND THE ACFT WAS ABLE TO MAINTAIN ALT IN SMOOTH AIR.
Narrative: DUE TO MODERATE TO SEVERE TURB WE WERE UNABLE TO MAINTAIN OUR ASSIGNED ALT OF 4000 FT MSL. IT WAS AS IF WE WERE IN A WAVE, WITH PWR BACK AND FORWARD YOKE THE ACFT CLBED TO 4300 FT MSL PER OUR ALTIMETER. ATC STATED HE SHOWED US AT 4400 FT MSL. OUR ALTIMETER WAS SET TO CONCORD'S CURRENT ALTIMETER SETTING PRIOR TO DEP. 2 MINS AFTER ATC ADVISED US OF OUR ALT, THEY GAVE US 6000 FT MSL AS AN ASSIGNED ALT AND THE AIR WAS SMOOTH FOR THE REST OF OUR FLT, NO FURTHER ALT PROBS. WE WERE IMC FOR 80% OF THE FLT IN LIGHT RAIN AND VERY LIGHT RIME ICE. AT THE TIME THE TURB HIT US WE WERE JUST LEVELING OFF AND WAS UNABLE TO CORRECT THE ALTDEV WITHOUT OVER STRESSING THE ACFT.
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.