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Flight crew of an air carrier widebody transport aircraft overshot altitude due to a malfunctioned AFDS (automatic flight director system).
| Attributes | |
| ACN | 242565 |
| Time | |
| Date | 199305 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mqp |
| State Reference | TX |
| Altitude | msl bound lower : 31000 msl bound upper : 31600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 150 flight time total : 10000 flight time type : 1500 |
| ASRS Report | 242565 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While flying a widebody transport with autoplt engaged and climbing to FL310, I noticed that at approximately 700 ft prior to reaching FL310, the altitude alerter light illuminated normally, which indicated the impending level off. The ADI display annunciated altitude 'capture' and the AFDS panel annunciated 'altitude hold' which would also be a normal indication. However, the autoplt continued climbing the aircraft through FL310 and at 31300 ft I disengaged the autoplt. The climb was arrested at 31600 ft and I commenced an immediate descent back to FL310. There was no conflicting traffic in the area at that time. The flight continued to its destination with no further incident.
Original NASA ASRS Text
Title: FLC OF AN ACR WDB ACFT OVERSHOT ALT DUE TO A MALFUNCTIONED AFDS (AUTO FLT DIRECTOR SYS).
Narrative: WHILE FLYING A WDB WITH AUTOPLT ENGAGED AND CLBING TO FL310, I NOTICED THAT AT APPROX 700 FT PRIOR TO REACHING FL310, THE ALT ALERTER LIGHT ILLUMINATED NORMALLY, WHICH INDICATED THE IMPENDING LEVEL OFF. THE ADI DISPLAY ANNUNCIATED ALT 'CAPTURE' AND THE AFDS PANEL ANNUNCIATED 'ALT HOLD' WHICH WOULD ALSO BE A NORMAL INDICATION. HOWEVER, THE AUTOPLT CONTINUED CLBING THE ACFT THROUGH FL310 AND AT 31300 FT I DISENGAGED THE AUTOPLT. THE CLB WAS ARRESTED AT 31600 FT AND I COMMENCED AN IMMEDIATE DSCNT BACK TO FL310. THERE WAS NO CONFLICTING TFC IN THE AREA AT THAT TIME. THE FLT CONTINUED TO ITS DEST WITH NO FURTHER INCIDENT.
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.