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A falcon 20 first officer descends 500 ft below his assigned altitude when the altitude capture fails to perform as expected 60 mi northwest of fll, fl.
| Attributes | |
| ACN | 504970 |
| Time | |
| Date | 200103 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : flcp.airport |
| State Reference | FL |
| Altitude | msl bound lower : 10500 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Thunderstorm |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zma.artcc tower : sea.tower |
| Operator | general aviation : corporate |
| Make Model Name | Falcon 20FJF/20C/20D/20E/20F |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 11000 flight time type : 1000 |
| ASRS Report | 504970 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot inflight encounter : weather non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : became reoriented flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Weather Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were given descent to 11000 ft, first officer was flying. We had a lot of convective WX around. I was busy with communication, checklists and radar operation. I called out of '12000 ft for 11000 ft' on the descent. The autoplt was engaged with altitude select selected in the descent. Out of 10800 ft, I noticed the continuation of descent and called '11000 ft' then '11000 ft was assigned altitude.' first officer arrested the descent at 10500 ft and returned to 11000 ft. Workload at the time, I am sure, was a factor in the altitude bust. Altitude select, for some reason unknown, did not level off the aircraft at 11000 ft. I suspect maybe the pitch knob may have been moved during the altitude lock-on and eliminated the lock-on of the autoplt at 11000 ft.
Original NASA ASRS Text
Title: A FALCON 20 FO DSNDS 500 FT BELOW HIS ASSIGNED ALT WHEN THE ALT CAPTURE FAILS TO PERFORM AS EXPECTED 60 MI NW OF FLL, FL.
Narrative: WE WERE GIVEN DSCNT TO 11000 FT, FO WAS FLYING. WE HAD A LOT OF CONVECTIVE WX AROUND. I WAS BUSY WITH COM, CHKLISTS AND RADAR OP. I CALLED OUT OF '12000 FT FOR 11000 FT' ON THE DSCNT. THE AUTOPLT WAS ENGAGED WITH ALT SELECT SELECTED IN THE DSCNT. OUT OF 10800 FT, I NOTICED THE CONTINUATION OF DSCNT AND CALLED '11000 FT' THEN '11000 FT WAS ASSIGNED ALT.' FO ARRESTED THE DSCNT AT 10500 FT AND RETURNED TO 11000 FT. WORKLOAD AT THE TIME, I AM SURE, WAS A FACTOR IN THE ALT BUST. ALT SELECT, FOR SOME REASON UNKNOWN, DID NOT LEVEL OFF THE ACFT AT 11000 FT. I SUSPECT MAYBE THE PITCH KNOB MAY HAVE BEEN MOVED DURING THE ALT LOCK-ON AND ELIMINATED THE LOCK-ON OF THE AUTOPLT AT 11000 FT.
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.