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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier captain reported that the autoplt malfunctioned, causing him to descend from the assigned altitude in ZHU airspace.
| Attributes | |
| ACN | 515200 |
| Time | |
| Date | 200106 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : hub.vor |
| State Reference | TX |
| Altitude | msl bound lower : 15600 msl bound upper : 16000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : lga.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 23500 flight time type : 500 |
| ASRS Report | 515200 |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : company policies non adherence : far non adherence : clearance |
| Resolutory Action | flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descending to 16000 ft, the autoplt failed to operate normally. Went into capture mode, but never went into a decreasing leveloff. Had to disconnect autoplt and manually level back off. Descended to approximately 15600 ft before climbing back to 16000 ft. Wrote up autoplt for maintenance to fix.
Original NASA ASRS Text
Title: AN ACR CAPT RPTED THAT THE AUTOPLT MALFUNCTIONED, CAUSING HIM TO DSND FROM THE ASSIGNED ALT IN ZHU AIRSPACE.
Narrative: DSNDING TO 16000 FT, THE AUTOPLT FAILED TO OPERATE NORMALLY. WENT INTO CAPTURE MODE, BUT NEVER WENT INTO A DECREASING LEVELOFF. HAD TO DISCONNECT AUTOPLT AND MANUALLY LEVEL BACK OFF. DSNDED TO APPROX 15600 FT BEFORE CLBING BACK TO 16000 FT. WROTE UP AUTOPLT FOR MAINT TO FIX.
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.