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Upon return to airport for precautionary landing due to mach trim problem, B737-200 flight crew overshoot assigned altitude.
| Attributes | |
| ACN | 509013 |
| Time | |
| Date | 200104 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sfo.airport |
| State Reference | CA |
| Altitude | msl bound lower : 18000 msl bound upper : 20000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : vacating altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 7000 flight time type : 1000 |
| ASRS Report | 509013 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : overshoot non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : mach trim other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated controller : issued new clearance flight crew : landed as precaution flight crew : overcame equipment problem flight crew : took precautionary avoidance action |
| Consequence | other |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During climb to FL230, we began having a problem trimming the aircraft nose-down. The nose-down electric trim would not work. The aircraft's electric trim began trimming nose-up, the autoplt was off. The captain was flying and was having a hard time landing nose-down. We decided to return to sfo. We were at FL230 when ATC cleared us to FL200 with a turn back to the airport. The captain began the descent and I started the QRH. I reminded him of our altitude. We were cleared to and turned around to look for popped circuit breakers. When I turned back around, he had descended to FL180. Once we slowed the airplane down, the trim began to work normally. I think the aircraft was loaded too far aft of center of gravity, but all of our paperwork indicated we were ok.
Original NASA ASRS Text
Title: UPON RETURN TO ARPT FOR PRECAUTIONARY LNDG DUE TO MACH TRIM PROB, B737-200 FLC OVERSHOOT ASSIGNED ALT.
Narrative: DURING CLB TO FL230, WE BEGAN HAVING A PROB TRIMMING THE ACFT NOSE-DOWN. THE NOSE-DOWN ELECTRIC TRIM WOULD NOT WORK. THE ACFT'S ELECTRIC TRIM BEGAN TRIMMING NOSE-UP, THE AUTOPLT WAS OFF. THE CAPT WAS FLYING AND WAS HAVING A HARD TIME LNDG NOSE-DOWN. WE DECIDED TO RETURN TO SFO. WE WERE AT FL230 WHEN ATC CLRED US TO FL200 WITH A TURN BACK TO THE ARPT. THE CAPT BEGAN THE DSCNT AND I STARTED THE QRH. I REMINDED HIM OF OUR ALT. WE WERE CLRED TO AND TURNED AROUND TO LOOK FOR POPPED CIRCUIT BREAKERS. WHEN I TURNED BACK AROUND, HE HAD DSNDED TO FL180. ONCE WE SLOWED THE AIRPLANE DOWN, THE TRIM BEGAN TO WORK NORMALLY. I THINK THE ACFT WAS LOADED TOO FAR AFT OF CTR OF GRAVITY, BUT ALL OF OUR PAPERWORK INDICATED WE WERE OK.
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.