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A late descent clearance, a high rate of descent, an autoplt disconnect followed by a too late recovery attempt, end in an altitude overshoot.
| Attributes | |
| ACN | 507760 |
| Time | |
| Date | 200104 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mmun.airport |
| State Reference | FO |
| Altitude | msl single value : 18000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Plan | IFR |
| Aircraft 2 | |
| Flight Phase | descent : intermediate altitude |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 13000 flight time type : 3000 |
| ASRS Report | 507760 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Aircraft ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cleared from FL330 to descend/maintain FL180. Programmed autoflt VNAV to descend and armed FL180. Because we were close to destination, we were descending with speed brakes extended at maximum descent rate. As we approached FL180, we noticed that autoplt had disarmed altitude capture. Disconnected autoplt and initiated leveloff, but went several hundred ft below assigned altitude. Contributing factors: late descent clearance, autoplt failure to capture altitude.
Original NASA ASRS Text
Title: A LATE DSCNT CLRNC, A HIGH RATE OF DSCNT, AN AUTOPLT DISCONNECT FOLLOWED BY A TOO LATE RECOVERY ATTEMPT, END IN AN ALT OVERSHOOT.
Narrative: CLRED FROM FL330 TO DSND/MAINTAIN FL180. PROGRAMMED AUTOFLT VNAV TO DSND AND ARMED FL180. BECAUSE WE WERE CLOSE TO DEST, WE WERE DSNDING WITH SPD BRAKES EXTENDED AT MAX DSCNT RATE. AS WE APCHED FL180, WE NOTICED THAT AUTOPLT HAD DISARMED ALT CAPTURE. DISCONNECTED AUTOPLT AND INITIATED LEVELOFF, BUT WENT SEVERAL HUNDRED FT BELOW ASSIGNED ALT. CONTRIBUTING FACTORS: LATE DSCNT CLRNC, AUTOPLT FAILURE TO CAPTURE ALT.
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.