 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
An air carrier widebody transport crew climbed above its assigned altitude. Altitude deviation. WX factors cumulonimbus that could not be avoided that produced turbulence. Aircraft equipment problem autoplt could not handle turbulence and disconnected.
| Attributes | |
| ACN | 347750 |
| Time | |
| Date | 199609 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : orf |
| State Reference | VA |
| Altitude | msl bound lower : 33000 msl bound upper : 33300 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : atlantic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 25000 flight time type : 4500 |
| ASRS Report | 347750 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 100 flight time total : 20000 flight time type : 6000 |
| ASRS Report | 347887 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude inflight encounter : weather non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : overcame equipment problem flight crew : became reoriented |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Just prior to coast-in, flight encountered tops of cumulonimbus on track, unable to avoid. About time of radar contact with ZDC, experienced turbulence which disconnected autoplt. Aircraft climbed 300 ft above assigned altitude before the excursion was corrected.
Original NASA ASRS Text
Title: AN ACR WDB CREW CLBED ABOVE ITS ASSIGNED ALT. ALTDEV. WX FACTORS CUMULONIMBUS THAT COULD NOT BE AVOIDED THAT PRODUCED TURB. ACFT EQUIP PROB AUTOPLT COULD NOT HANDLE TURB AND DISCONNECTED.
Narrative: JUST PRIOR TO COAST-IN, FLT ENCOUNTERED TOPS OF CUMULONIMBUS ON TRACK, UNABLE TO AVOID. ABOUT TIME OF RADAR CONTACT WITH ZDC, EXPERIENCED TURB WHICH DISCONNECTED AUTOPLT. ACFT CLBED 300 FT ABOVE ASSIGNED ALT BEFORE THE EXCURSION WAS CORRECTED.
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.