Narrative:

On approach to smf, normal flight, night, VMC, some light turbulence en route, all checklists complied with. Captain was PF. Upon call for gear down we received both mains green, no nose gear indication. We recycled gear and received left main green, 1/2 nose indication illuminated green, no right main indication. We recycled gear again and received same indication. We initiated a go around and ran QRH checklists. Captain flew and ran radios. Approach control provided vectors and terrain clearance. I apprised flight attendants of situation and told them to prepare for emergency landing and possible, but not probable evacuate/evacuation. Captain declared emergency. QRH complied with, and visual port in cabin utilized to verify right gear down and locked. Several low level (500 ft AGL) fly-by's made to get confirmation of gear down. (Difficulties to get confirmation encountered due to darkness.) just prior to landing, company called to advise us to fly to oak (big maintenance base). We declined, landing uneventful. Ground personnel unable to lock gear doors up for taxi in. We repressurized system, brought doors up and taxied to gate. After securing aircraft, we found right gear door back on ground. The landing had apparently torn off the door skid and uplock latch. Door skin was also abraded. No other apparent damage. No injuries reported.

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Original NASA ASRS Text

Title: AN MD80 ON APCH AT 2000 FT DECLARED AN EMER DUE TO THE R MAIN LNDG POS INDICATOR BLANK WITH GEAR EXTENDED CAUSE UNKNOWN.

Narrative: ON APCH TO SMF, NORMAL FLT, NIGHT, VMC, SOME LIGHT TURB ENRTE, ALL CHKLISTS COMPLIED WITH. CAPT WAS PF. UPON CALL FOR GEAR DOWN WE RECEIVED BOTH MAINS GREEN, NO NOSE GEAR INDICATION. WE RECYCLED GEAR AND RECEIVED L MAIN GREEN, 1/2 NOSE INDICATION ILLUMINATED GREEN, NO R MAIN INDICATION. WE RECYCLED GEAR AGAIN AND RECEIVED SAME INDICATION. WE INITIATED A GAR AND RAN QRH CHKLISTS. CAPT FLEW AND RAN RADIOS. APCH CTL PROVIDED VECTORS AND TERRAIN CLRNC. I APPRISED FLT ATTENDANTS OF SIT AND TOLD THEM TO PREPARE FOR EMER LNDG AND POSSIBLE, BUT NOT PROBABLE EVAC. CAPT DECLARED EMER. QRH COMPLIED WITH, AND VISUAL PORT IN CABIN UTILIZED TO VERIFY R GEAR DOWN AND LOCKED. SEVERAL LOW LEVEL (500 FT AGL) FLY-BY'S MADE TO GET CONFIRMATION OF GEAR DOWN. (DIFFICULTIES TO GET CONFIRMATION ENCOUNTERED DUE TO DARKNESS.) JUST PRIOR TO LNDG, COMPANY CALLED TO ADVISE US TO FLY TO OAK (BIG MAINT BASE). WE DECLINED, LNDG UNEVENTFUL. GND PERSONNEL UNABLE TO LOCK GEAR DOORS UP FOR TAXI IN. WE REPRESSURIZED SYS, BROUGHT DOORS UP AND TAXIED TO GATE. AFTER SECURING ACFT, WE FOUND R GEAR DOOR BACK ON GND. THE LNDG HAD APPARENTLY TORN OFF THE DOOR SKID AND UPLOCK LATCH. DOOR SKIN WAS ALSO ABRADED. NO OTHER APPARENT DAMAGE. NO INJURIES RPTED.

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.