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B727 on STAR and cleared 10000 ft and 250 KTS, flight crew relying on autoplt to capture set altitude. It didn't capture so aircraft went 200 ft low. Reporter captain disconnected autoplt and returned to assigned.
| Attributes | |
| ACN | 399790 |
| Time | |
| Date | 199804 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mia |
| State Reference | FL |
| Altitude | msl bound lower : 9800 msl bound upper : 10000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mia tower : cos |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other arrival star : star enroute airway : mia |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 399790 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| ASRS Report | 399791 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : published procedure 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:
During autoplt descent to cross wever at 10000 ft and 250 KTS, altitude hold failed to work. Switch was engaged with about a 500 FPM descent. Stabilizer trim light came on. Autoplt was disengaged and correction to altitude was made. During correction received a TA. Total loss of altitude was 200 ft.
Original NASA ASRS Text
Title: B727 ON STAR AND CLRED 10000 FT AND 250 KTS, FLT CREW RELYING ON AUTOPLT TO CAPTURE SET ALT. IT DIDN'T CAPTURE SO ACFT WENT 200 FT LOW. RPTR CAPT DISCONNECTED AUTOPLT AND RETURNED TO ASSIGNED.
Narrative: DURING AUTOPLT DSCNT TO CROSS WEVER AT 10000 FT AND 250 KTS, ALT HOLD FAILED TO WORK. SWITCH WAS ENGAGED WITH ABOUT A 500 FPM DSCNT. STAB TRIM LIGHT CAME ON. AUTOPLT WAS DISENGAGED AND CORRECTION TO ALT WAS MADE. DURING CORRECTION RECEIVED A TA. TOTAL LOSS OF ALT WAS 200 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.