An MD80 on approach at 2700 ft declared an emergency due to right main landing gear unsafe warning. Gear checked visually and aircraft landed uneventfully.

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Attributes
ACN	432548
Time
Date	199903
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : smf.airport
State Reference	CA
Altitude	msl single value : 2700
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : mcc.tracon tower : smf.tower tower : sfo.tower
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 16r
Flight Phase	descent : approach landing : go around
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 12000 flight time type : 9000
ASRS Report	432548
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : landing gear warning other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

ILS approach to runway 16R at smf. Approximately 9 DME, gear lowered. Indications: left -- down and locked, nose -- down and locked. Right -- no down and locked. Vectored around pattern. Recycled gear same results. Accomplished emergency procedures checklist. Declared emergency. Accomplished low approach to visually verify gear down. First officer verified visually. Notified crew and passenger for possible evacuate/evacuation. Touchdown and rollout normal except for gear door extend. No injuries. Callback conversation with reporter revealed the following information: the reporter stated that no corrective maintenance action information was known.

Original NASA ASRS Text

Title: AN MD80 ON APCH AT 2700 FT DECLARED AN EMER DUE TO R MAIN LNDG GEAR UNSAFE WARNING. GEAR CHKED VISUALLY AND ACFT LANDED UNEVENTFULLY.

Narrative: ILS APCH TO RWY 16R AT SMF. APPROX 9 DME, GEAR LOWERED. INDICATIONS: L -- DOWN AND LOCKED, NOSE -- DOWN AND LOCKED. R -- NO DOWN AND LOCKED. VECTORED AROUND PATTERN. RECYCLED GEAR SAME RESULTS. ACCOMPLISHED EMER PROCS CHKLIST. DECLARED EMER. ACCOMPLISHED LOW APCH TO VISUALLY VERIFY GEAR DOWN. FO VERIFIED VISUALLY. NOTIFIED CREW AND PAX FOR POSSIBLE EVAC. TOUCHDOWN AND ROLLOUT NORMAL EXCEPT FOR GEAR DOOR EXTEND. NO INJURIES. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT NO CORRECTIVE MAINT ACTION INFO WAS KNOWN.

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.