A DC9-50 in cruise at FL330 declared an emergency and diverted due to a nose landing gear unsafe warning light possibly caused by a failed sensor.

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Attributes
ACN	398688
Time
Date	199804
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : vxv
State Reference	TN
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	common carrier : air carrier
Make Model Name	DC-9 50
Operating Under FAR Part	Part 121
Flight Phase	cruise other other other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time type : 560
ASRS Report	398688
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	aircraft : equipment problem dissipated flight crew : declared emergency flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Unsafe nose gear light illuminated in-flight. Diverted to atl for maintenance. Unsafe nose gear down indication when gear was lowered. Ran checklist, got '3 green.' declared precautionary emergency and landed without incident. Suspect it was a sensor problem.

Original NASA ASRS Text

Title: A DC9-50 IN CRUISE AT FL330 DECLARED AN EMER AND DIVERTED DUE TO A NOSE LNDG GEAR UNSAFE WARNING LIGHT POSSIBLY CAUSED BY A FAILED SENSOR.

Narrative: UNSAFE NOSE GEAR LIGHT ILLUMINATED INFLT. DIVERTED TO ATL FOR MAINT. UNSAFE NOSE GEAR DOWN INDICATION WHEN GEAR WAS LOWERED. RAN CHKLIST, GOT '3 GREEN.' DECLARED PRECAUTIONARY EMER AND LANDED WITHOUT INCIDENT. SUSPECT IT WAS A SENSOR PROB.

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.