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Altitude deviation altitude overshot in descent. Non adherence to ATC clearance in B727 during a level off procedure.
| Attributes | |
| ACN | 349320 |
| Time | |
| Date | 199610 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : vrb |
| State Reference | FL |
| Altitude | msl bound lower : 15500 msl bound upper : 16000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zma |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| ASRS Report | 349320 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : instrument pilot : commercial pilot : flight engineer |
| ASRS Report | 349322 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : became reoriented |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
ATC facility: ZMA. Location: vrb 162/70. We were cleared to descend to 16000 ft. We leveled off using the autoplt, however the autoplt trim did not keep up with the airplane and the altitude hold did not maintain altitude. We descended 400 ft before we realized it. We disconnected the autoplt and recovered to 16000 ft. We descended to 15500 ft before recovering. The controller made no mention of the incident. Supplemental information from acn 349322: apparently autoplt was unable to keep up with changing airspeed required and allowed aircraft to descend.
Original NASA ASRS Text
Title: ALTDEV ALT OVERSHOT IN DSCNT. NON ADHERENCE TO ATC CLRNC IN B727 DURING A LEVEL OFF PROC.
Narrative: ATC FACILITY: ZMA. LOCATION: VRB 162/70. WE WERE CLRED TO DSND TO 16000 FT. WE LEVELED OFF USING THE AUTOPLT, HOWEVER THE AUTOPLT TRIM DID NOT KEEP UP WITH THE AIRPLANE AND THE ALT HOLD DID NOT MAINTAIN ALT. WE DSNDED 400 FT BEFORE WE REALIZED IT. WE DISCONNECTED THE AUTOPLT AND RECOVERED TO 16000 FT. WE DSNDED TO 15500 FT BEFORE RECOVERING. THE CTLR MADE NO MENTION OF THE INCIDENT. SUPPLEMENTAL INFO FROM ACN 349322: APPARENTLY AUTOPLT WAS UNABLE TO KEEP UP WITH CHANGING AIRSPD REQUIRED AND ALLOWED ACFT TO DSND.
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.