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A B737-300 returned to the field due to stabilizer trim operating in low speed only. Caused by an improperly rigged flaps up switch.
| Attributes | |
| ACN | 595765 |
| Time | |
| Date | 200310 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance lead technician : 5 maintenance technician : 15 |
| ASRS Report | 595765 |
| Person 2 | |
| Affiliation | company : air carrier |
| Qualification | technician : fcc |
| Experience | maintenance avionics : 17.5 |
| ASRS Report | 595996 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | aircraft : automation overrode flight crew flight crew : diverted to another airport flight crew : overcame equipment problem |
| Consequence | other other |
| Factors | |
| Maintenance | performance deficiency : installation performance deficiency : logbook entry performance deficiency : testing performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
Previous shifts troubleshooting and subsequent replacement of takeoff warning flap switch, left wing, lead to return of aircraft after takeoff. We finished close-up of task after day shift mechanics replaced flap switch. My radio and electrical technician performed CAT III test as called out in the maintenance manual and pickle switches worked normally. Upon arrival flight crew said aircraft flew nose up using either channel of autoplt. Pickle switches operated normally.
Original NASA ASRS Text
Title: A B737-300 RETURNED TO THE FIELD DUE TO STABILIZER TRIM OPERATING IN LOW SPD ONLY. CAUSED BY AN IMPROPERLY RIGGED FLAPS UP SWITCH.
Narrative: PREVIOUS SHIFTS TROUBLESHOOTING AND SUBSEQUENT REPLACEMENT OF TKOF WARNING FLAP SWITCH, L WING, LEAD TO RETURN OF ACFT AFTER TKOF. WE FINISHED CLOSE-UP OF TASK AFTER DAY SHIFT MECHS REPLACED FLAP SWITCH. MY RADIO AND ELECTRICAL TECHNICIAN PERFORMED CAT III TEST AS CALLED OUT IN THE MAINT MANUAL AND PICKLE SWITCHES WORKED NORMALLY. UPON ARR FLT CREW SAID ACFT FLEW NOSE UP USING EITHER CHANNEL OF AUTOPLT. PICKLE SWITCHES OPERATED NORMALLY.
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.