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Flight crew of an medium large transport overshot altitude on descent due to a problem with the autoplt preselect hold mode.
| Attributes | |
| ACN | 333250 |
| Time | |
| Date | 199604 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mia |
| State Reference | FL |
| Altitude | msl bound lower : 15500 msl bound upper : 16000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mia |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 90 flight time total : 15000 flight time type : 2000 |
| ASRS Report | 333250 |
| 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 |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
In descent to cross heatt intersection at 16000 ft MSL, the autoplt was engaged and not keeping adequate descent to comply with restr. I extended speed brakes until 16500 ft when I retracted the speed brakes. The autoplt continued the descent to 15500 ft when I disconnected the autoplt and manually returned the aircraft to 16000 ft. No apparent conflict and no comment from ATC controller.
Original NASA ASRS Text
Title: FLC OF AN MLG OVERSHOT ALT ON DSCNT DUE TO A PROB WITH THE AUTOPLT PRESELECT HOLD MODE.
Narrative: IN DSCNT TO CROSS HEATT INTXN AT 16000 FT MSL, THE AUTOPLT WAS ENGAGED AND NOT KEEPING ADEQUATE DSCNT TO COMPLY WITH RESTR. I EXTENDED SPD BRAKES UNTIL 16500 FT WHEN I RETRACTED THE SPD BRAKES. THE AUTOPLT CONTINUED THE DSCNT TO 15500 FT WHEN I DISCONNECTED THE AUTOPLT AND MANUALLY RETURNED THE ACFT TO 16000 FT. NO APPARENT CONFLICT AND NO COMMENT FROM ATC CTLR.
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.