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Altitude deviation altitude overshot in descent. Potential conflict ensues with opposite direction traffic.
| Attributes | |
| ACN | 291077 |
| Time | |
| Date | 199412 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : dbq |
| State Reference | IA |
| Altitude | msl bound lower : 16800 msl bound upper : 17000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhn |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | enroute airway : zau |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 260 flight time total : 10000 |
| ASRS Report | 291077 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : overcame equipment problem flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Miss Distance | horizontal : 18000 vertical : 800 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While rapidly descending from FL240 to 17000 over dbq VOR, aircraft descended below cleared altitude (17000 ft) to 16800 ft. Another aircraft was approaching us about 3 mi away and he was at 16000 ft. We received a TCASII RA to 'monitor vertical speed' and not descend (red advisory on ivsi from 500-2000 FPM. The aircraft was on autoplt and we were descending rapidly to avoid turbulence at cruise altitude and during initial descent. I suspect a malfunction of the autoplt and annotated the problem in the aircraft logbook. Maintenance action pending.
Original NASA ASRS Text
Title: ALTDEV ALT OVERSHOT IN DSCNT. POTENTIAL CONFLICT ENSUES WITH OPPOSITE DIRECTION TFC.
Narrative: WHILE RAPIDLY DSNDING FROM FL240 TO 17000 OVER DBQ VOR, ACFT DSNDED BELOW CLRED ALT (17000 FT) TO 16800 FT. ANOTHER ACFT WAS APCHING US ABOUT 3 MI AWAY AND HE WAS AT 16000 FT. WE RECEIVED A TCASII RA TO 'MONITOR VERT SPD' AND NOT DSND (RED ADVISORY ON IVSI FROM 500-2000 FPM. THE ACFT WAS ON AUTOPLT AND WE WERE DSNDING RAPIDLY TO AVOID TURB AT CRUISE ALT AND DURING INITIAL DSCNT. I SUSPECT A MALFUNCTION OF THE AUTOPLT AND ANNOTATED THE PROB IN THE ACFT LOGBOOK. MAINT ACTION PENDING.
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.