<< >> NASA ASRS Report 358628, January 1997

An air carrier B757-200 crew landed successfully after a landing gear warning system would not show one gear down and locked. Aircraft equipment problem possible burned out bulbs, probable other landing gear warning system problem.

Attributes
ACN	358628
Time
Date	199701
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bwi
State Reference	MD
Altitude	agl bound lower : 0 agl bound upper : 1000
Environment
Light	Night
Aircraft 1
Controlling Facilities	tower : bwi
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	landing other other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	358628
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Location: bwi/155/10. Routine flight until gear extension on approach to bwi. No left main gear green light. Recycled gear. Same indication, right and nose gear normal. Entered downwind and completed gear disagree abnormal. Still no left main gear green light. Attempted contact with dispatch and maintenance. No luck due to no phone patch capability at bwi operations and altitude too low for air carrier radio. Performed fly-by. Bwi personnel in truck near runway reported gear appeared to be normally extended. Flew additional pattern to normal landing on the runway, requested emergency vehicles observe normal gear position. Air carrier maintenance observed same and pinned gear. Uneventful taxi to gate. Suggest gear disagree abnormal provide additional guidance immediately following the step, 'landing gear lights, test.' our left main gear light did not test. Captain's attempts to change the bulbs were unsuccessful, perhaps due to the complex design of the light module.

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Original NASA ASRS Text

Title: AN ACR B757-200 CREW LANDED SUCCESSFULLY AFTER A LNDG GEAR WARNING SYS WOULD NOT SHOW ONE GEAR DOWN AND LOCKED. ACFT EQUIP PROB POSSIBLE BURNED OUT BULBS, PROBABLE OTHER LNDG GEAR WARNING SYS PROB.

Narrative: LOCATION: BWI/155/10. ROUTINE FLT UNTIL GEAR EXTENSION ON APCH TO BWI. NO L MAIN GEAR GREEN LIGHT. RECYCLED GEAR. SAME INDICATION, R AND NOSE GEAR NORMAL. ENTERED DOWNWIND AND COMPLETED GEAR DISAGREE ABNORMAL. STILL NO L MAIN GEAR GREEN LIGHT. ATTEMPTED CONTACT WITH DISPATCH AND MAINT. NO LUCK DUE TO NO PHONE PATCH CAPABILITY AT BWI OPS AND ALT TOO LOW FOR ACR RADIO. PERFORMED FLY-BY. BWI PERSONNEL IN TRUCK NEAR RWY RPTED GEAR APPEARED TO BE NORMALLY EXTENDED. FLEW ADDITIONAL PATTERN TO NORMAL LNDG ON THE RWY, REQUESTED EMER VEHICLES OBSERVE NORMAL GEAR POS. ACR MAINT OBSERVED SAME AND PINNED GEAR. UNEVENTFUL TAXI TO GATE. SUGGEST GEAR DISAGREE ABNORMAL PROVIDE ADDITIONAL GUIDANCE IMMEDIATELY FOLLOWING THE STEP, 'LNDG GEAR LIGHTS, TEST.' OUR L MAIN GEAR LIGHT DID NOT TEST. CAPT'S ATTEMPTS TO CHANGE THE BULBS WERE UNSUCCESSFUL, PERHAPS DUE TO THE COMPLEX DESIGN OF THE LIGHT MODULE.

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.