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Flight crew of B727 has malfunction of altitude capture and descends below assigned altitude. Disengage autoplt and return to assigned altitude.
| Attributes | |
| ACN | 358279 |
| Time | |
| Date | 199701 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : slc |
| State Reference | UT |
| Altitude | msl bound lower : 10500 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : slc |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 60 flight time total : 25000 flight time type : 18000 |
| ASRS Report | 358279 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 4000 flight time type : 2600 |
| ASRS Report | 358412 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : far |
| 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:
First officer flying. Descending to 11000 ft into slc, VMC conditions, on autoplt with automatic leveloff engaged, aircraft failed to leveloff although it had previously done so perfectly. I noticed the descent below 11000 ft at about 10500 ft and grabbed the control column, disengaging the autoplt and adding power, returning immediately to 11000 ft. We were VMC with no other aircraft on 25 mi range on TCASII (below position) and slc was clearly visible 30 mi ahead.
Original NASA ASRS Text
Title: FLC OF B727 HAS MALFUNCTION OF ALT CAPTURE AND DSNDS BELOW ASSIGNED ALT. DISENGAGE AUTOPLT AND RETURN TO ASSIGNED ALT.
Narrative: FO FLYING. DSNDING TO 11000 FT INTO SLC, VMC CONDITIONS, ON AUTOPLT WITH AUTO LEVELOFF ENGAGED, ACFT FAILED TO LEVELOFF ALTHOUGH IT HAD PREVIOUSLY DONE SO PERFECTLY. I NOTICED THE DSCNT BELOW 11000 FT AT ABOUT 10500 FT AND GRABBED THE CTL COLUMN, DISENGAGING THE AUTOPLT AND ADDING PWR, RETURNING IMMEDIATELY TO 11000 FT. WE WERE VMC WITH NO OTHER ACFT ON 25 MI RANGE ON TCASII (BELOW POS) AND SLC WAS CLRLY VISIBLE 30 MI AHEAD.
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.