Narrative:

On arrival into ZZZ1 flying ILS 2, at 7.6 mi, completed gear down landing checklist with the nose gear red warning lights/horn 'on.' WX at the time was 1 mi with 700 ft, few clouds and rain. Flew missed approach procedure with radar vectoring towards the south in VMC. Cycled the landing gear twice with nose gear still showing unsafe. Referred to QRH and reviewed the manual gear extension. Unable to do fly-by for gear check due to WX. Returned to ZZZ2, declared emergency with equipment standing by. Descending into their airspace, completed manual landing gear extension with all green lights. Did fly-by following runway 8L and was told by tower that gear appeared down and locked. Flew back around right downwind and landed full stop on runway 8L. Exited runway at taxiway Y and had mechanics install nose gear pin. Taxied to gate without further incident.

Google
 

Original NASA ASRS Text

Title: B737-200 FLT CREW OVERCAME A NOSE GEAR UNSAFE CONDITION AFTER RETURN LAND AT ZZZ2. DETECTION OF PROB ON FINAL APCH TO ZZZ1.

Narrative: ON ARR INTO ZZZ1 FLYING ILS 2, AT 7.6 MI, COMPLETED GEAR DOWN LNDG CHKLIST WITH THE NOSE GEAR RED WARNING LIGHTS/HORN 'ON.' WX AT THE TIME WAS 1 MI WITH 700 FT, FEW CLOUDS AND RAIN. FLEW MISSED APCH PROC WITH RADAR VECTORING TOWARDS THE S IN VMC. CYCLED THE LNDG GEAR TWICE WITH NOSE GEAR STILL SHOWING UNSAFE. REFERRED TO QRH AND REVIEWED THE MANUAL GEAR EXTENSION. UNABLE TO DO FLY-BY FOR GEAR CHK DUE TO WX. RETURNED TO ZZZ2, DECLARED EMER WITH EQUIP STANDING BY. DSNDING INTO THEIR AIRSPACE, COMPLETED MANUAL LNDG GEAR EXTENSION WITH ALL GREEN LIGHTS. DID FLY-BY FOLLOWING RWY 8L AND WAS TOLD BY TWR THAT GEAR APPEARED DOWN AND LOCKED. FLEW BACK AROUND R DOWNWIND AND LANDED FULL STOP ON RWY 8L. EXITED RWY AT TXWY Y AND HAD MECHS INSTALL NOSE GEAR PIN. TAXIED TO GATE WITHOUT FURTHER INCIDENT.

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.