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B757 flight crew reports unsched stabilizer trim light followed by automatic pilot disconnect during descent. QRH complied with and remainder of flight flown using alternate trim switches.
| Attributes | |
| ACN | 773385 |
| Time | |
| Date | 200802 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : bos.airport |
| State Reference | MA |
| Altitude | msl single value : 13000 |
| Aircraft 1 | |
| Controlling Facilities | tracon : a90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival star : n/a |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 240 flight time total : 13000 flight time type : 6000 |
| ASRS Report | 773385 |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : unsched stab trim light |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
During descent; unscheduled stabilizer trim light annunciated followed by autoplt disconnect. Followed QRH and flight manual procedures. Using manual control (hand flying) aircraft control forces were stiffer than normal. Flew rest of the approach manually and had to trim using center pedestal switches. The first officer also flew the aircraft to verify my impressions of the control forces required. Approach and landing were otherwise uneventful. Entered write-up in maintenance log and discussed aircraft status with maintenance.
Original NASA ASRS Text
Title: B757 FLT CREW REPORTS UNSCHED STAB TRIM LIGHT FOLLOWED BY AUTO PILOT DISCONNECT DURING DESCENT. QRH COMPLIED WITH AND REMAINDER OF FLIGHT FLOWN USING ALTERNATE TRIM SWITCHES.
Narrative: DURING DSCNT; UNSCHEDULED STABILIZER TRIM LIGHT ANNUNCIATED FOLLOWED BY AUTOPLT DISCONNECT. FOLLOWED QRH AND FLT MANUAL PROCS. USING MANUAL CTL (HAND FLYING) ACFT CTL FORCES WERE STIFFER THAN NORMAL. FLEW REST OF THE APCH MANUALLY AND HAD TO TRIM USING CTR PEDESTAL SWITCHES. THE FO ALSO FLEW THE ACFT TO VERIFY MY IMPRESSIONS OF THE CTL FORCES REQUIRED. APCH AND LNDG WERE OTHERWISE UNEVENTFUL. ENTERED WRITE-UP IN MAINT LOG AND DISCUSSED ACFT STATUS WITH MAINT.
Data retrieved from NASA's ASRS site as of May 2009 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.