AN MD-82 FLIGHT CREW NOTICED THEY HAD NO 'LANDING GEAR SAFE' INDICATING LIGHTS AFTER GEAR EXTENSION. THEY DECLARED AN EMERGENCY; VERIFIED THE GEAR WAS DOWN WITH THE PERISCOPE; AND LANDED NORMALLY.

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WE LOWERED THE GEAR AND RECEIVED NO INDICATION ON THE GEAR LIGHTS OF UNSAFE; IN TRANSIT; ETC. NO INDICATION AT ALL; DEAD. EXECUTED GAR AND DECLARED AN EMER. WORKED THROUGH OUR PUBLISHED PROCS AND WAS STILL UNABLE TO GET ANY INDICATION. FO WENT BACK AND VISUALLY IDENTED THAT THE GEAR WAS DOWN AND LOCKED USING THE MD80'S 'PERISCOPE' TUBE THAT ALLOWS VIEWING OF THE VISUAL DOWN AND LOCK INDICATORS ON THE GEAR. VISUAL INDICATOR IN THE COCKPIT SHOWED THAT THE NOSE GEAR WAS DOWN AND LOCKED AND IT ALSO 'FELT RIGHT.' RETURNED; MADE A NORMAL LNDG WITH A GENTLE ROLLOUT TO A STOP ON THE HIGH-SPD TURNOFF. OUR MAINT PERSONNEL INSPECTED THE GEAR AND FOR EXTRA SAFETY PINNED THEM IN THE LOCKED POS; SO THAT WE COULD TAXI BACK TO THE GATE. TAXIED TO THE GATE WITH NO FURTHER INCIDENT. A FAIRLY ROUTINE EMER WITH NO UNEXPECTED DIFFICULTIES; EXCEPT ONE. THE FO HAD A DIFFICULT TIME VIEWING THE VISUAL INDICATORS BECAUSE OF A DIRTY PERISCOPE TUBE. I COMMEND HIM ON HIS RESOURCEFULNESS ON GETTING IT CLEANED. EXPERIENCE AND A COOL HEAD GOT HIM THROUGH IT WITHOUT TOO MUCH STRESS AND DIFFICULTY WITH ALL OF THE PAX LOOKING ON -- IN A TIMELY MANNER. SUPPLEMENTAL INFO FROM ACN 809704: OUR NOSE GEAR INDICATED THE NOSE GEAR WAS DOWN AND LOCKED. WE DEPRESSURIZED THE CABIN AND I WENT INTO THE CABIN TO VISUALLY OBSERVE THE MAIN GEAR TO VERIFY IT WAS DOWN AND LOCKED. AFTER CLEANING THE MIRROR ON THE VIEWING TUBE; I WAS ABLE TO VERIFY THE MAIN GEAR WAS DOWN AND LOCKED.