An air carrier medium large transport crew had an unsafe landing gear indication.

Attributes
ACN	238009
Time
Date	199303
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : cvg
State Reference	OH
Altitude	agl bound lower : 500 agl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : cvg
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach landing other
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 85 flight time total : 8700 flight time type : 85
ASRS Report	238009
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 3500 flight time type : 1800
ASRS Report	238011
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Left main gear down and locked light (green) not illuminated with gear handle down. Also, left gear unsafe light (red) remained extinguished during transition of gear. Advised ATC. Requested delay vectors and performed abnormal procedure, and emergency gear extension procedure. No green light visual inspection did not confirm down and locked. Overflew runway 36L for visual inspection from the ground. Reply: 'saw 3 gear but left main did not appear normal.' stowed emergency gear lever and recycled gear. Raised emergency gear lever and again made visual inspection. Stripes appeared to be aligned. Prepared for 'emergency/abnormal landing.' landed uneventfully. Pinned gear and taxi in. Other information: landing gear warning circuit breaker tripped during a gear cycle. Flew msp-cvg with nose gear unsafe light (red) illuminated. After procedure compliance and dispatch/maintenance control concurrence (abnormal occurred after msp takeoff) established communication with dispatch/maintenance control in cvg area then lost reception due to location and altitude. Relayed intentions and progress through cvg operations. This communication was less than effective as far as feedback from maintenance control. Emergency was declared. All crew and support people performed duties very professionally.

Original NASA ASRS Text

Title: AN ACR MLG CREW HAD AN UNSAFE LNDG GEAR INDICATION.

Narrative: L MAIN GEAR DOWN AND LOCKED LIGHT (GREEN) NOT ILLUMINATED WITH GEAR HANDLE DOWN. ALSO, L GEAR UNSAFE LIGHT (RED) REMAINED EXTINGUISHED DURING TRANSITION OF GEAR. ADVISED ATC. REQUESTED DELAY VECTORS AND PERFORMED ABNORMAL PROC, AND EMER GEAR EXTENSION PROC. NO GREEN LIGHT VISUAL INSPECTION DID NOT CONFIRM DOWN AND LOCKED. OVERFLEW RWY 36L FOR VISUAL INSPECTION FROM THE GND. REPLY: 'SAW 3 GEAR BUT L MAIN DID NOT APPEAR NORMAL.' STOWED EMER GEAR LEVER AND RECYCLED GEAR. RAISED EMER GEAR LEVER AND AGAIN MADE VISUAL INSPECTION. STRIPES APPEARED TO BE ALIGNED. PREPARED FOR 'EMER/ABNORMAL LNDG.' LANDED UNEVENTFULLY. PINNED GEAR AND TAXI IN. OTHER INFO: LNDG GEAR WARNING CIRCUIT BREAKER TRIPPED DURING A GEAR CYCLE. FLEW MSP-CVG WITH NOSE GEAR UNSAFE LIGHT (RED) ILLUMINATED. AFTER PROC COMPLIANCE AND DISPATCH/MAINT CTL CONCURRENCE (ABNORMAL OCCURRED AFTER MSP TKOF) ESTABLISHED COM WITH DISPATCH/MAINT CTL IN CVG AREA THEN LOST RECEPTION DUE TO LOCATION AND ALT. RELAYED INTENTIONS AND PROGRESS THROUGH CVG OPS. THIS COM WAS LESS THAN EFFECTIVE AS FAR AS FEEDBACK FROM MAINT CTL. EMER WAS DECLARED. ALL CREW AND SUPPORT PEOPLE PERFORMED DUTIES VERY PROFESSIONALLY.

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.