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A B737-300 on takeoff climb at 100 ft were unable to retract the landing gear. Returned to the field. Caused by a failed throttle microswitch.
| Attributes | |
| ACN | 542056 |
| Time | |
| Date | 200203 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 1000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : zzz1.tracon tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 127 flight time total : 9700 flight time type : 5060 |
| ASRS Report | 542056 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : red gear unsafe light other flight crewa other flight crewb |
| Resolutory Action | flight crew : landed in emergency condition flight crew : overrode automation flight crew : diverted to another airport |
| Consequence | other other other |
| Supplementary | |
| Problem Areas | Chart Or Publication Aircraft |
| Primary Problem | Aircraft |
Narrative:
On departure, gear would not retract, checked QRH for a checklist for problem, none was found. Check cockpit for gear pins. All 3 pins were accounted for. Recycled gear to see if possible sensor glitch, still would not retract. With handle down, we had 3 green down and locked lights. Returned to ZZZ for landing, normal, but overweight. Maintenance sum: flight was canceled. Aircraft was maintenance ferried to ZZZ1. Maintenance placed aircraft on jacks, cycled gear and found gear retraction normal. Found red unsafe light indication problem. Troubleshot to intermitting S3 switch on the left autothrottle switch pack. Right/right switch pack per maintenance manual. Cycled gear several times. All operations check and indications normal. Performed overweight landing inspection with no defects found. Aircraft okay for service.
Original NASA ASRS Text
Title: A B737-300 ON TKOF CLB AT 100 FT WERE UNABLE TO RETRACT THE LNDG GEAR. RETURNED TO THE FIELD. CAUSED BY A FAILED THROTTLE MICROSWITCH.
Narrative: ON DEP, GEAR WOULD NOT RETRACT, CHKED QRH FOR A CHKLIST FOR PROB, NONE WAS FOUND. CHK COCKPIT FOR GEAR PINS. ALL 3 PINS WERE ACCOUNTED FOR. RECYCLED GEAR TO SEE IF POSSIBLE SENSOR GLITCH, STILL WOULD NOT RETRACT. WITH HANDLE DOWN, WE HAD 3 GREEN DOWN AND LOCKED LIGHTS. RETURNED TO ZZZ FOR LNDG, NORMAL, BUT OVERWT. MAINT SUM: FLT WAS CANCELED. ACFT WAS MAINT FERRIED TO ZZZ1. MAINT PLACED ACFT ON JACKS, CYCLED GEAR AND FOUND GEAR RETRACTION NORMAL. FOUND RED UNSAFE LIGHT INDICATION PROB. TROUBLESHOT TO INTERMITTING S3 SWITCH ON THE L AUTOTHROTTLE SWITCH PACK. R/R SWITCH PACK PER MAINT MANUAL. CYCLED GEAR SEVERAL TIMES. ALL OPS CHK AND INDICATIONS NORMAL. PERFORMED OVERWT LNDG INSPECTION WITH NO DEFECTS FOUND. ACFT OKAY FOR SVC.
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.