<< >> NASA ASRS Report 542056, March 2002

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.

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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.