B737 crew had the right main gear not show down and locked.

Attributes
ACN	622294
Time
Date	200306
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mfe.airport
State Reference	TX
Altitude	msl single value : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mfe.tower tower : sfo.tower
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing : go around
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 250 flight time total : 20000 flight time type : 3000
ASRS Report	622294
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : rt gear indication warning horn other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : provided flight assist flight crew : executed go around other
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

During the approach into mfe, upon landing gear extension, crew noted unsafe right main gear. Executed go around, first officer referred to QRH and performed checklist procedure for unsafe landing gear indication. Checklist completed, gear indicated 3 down and locked. Uneventful landing performed. The tower advised to fly down the runway and they would check the gear. The red gear light was on and the warning horn sounded when the throttle was retarded. I was 99% sure the gear was not down, but wanted another opinion. The tower advised the gear was no down. The missed approach is climb to 1500 ft and turn left to 2000 ft and direct to missi. During the turn, I advised to flight attendant to prepare for a possible emergency landing. We completed the manual gear extension and the gear indicated down and locked, the horn did not sound. We advised the tower we wanted to return. We made a normal landing. 2 hours later we flew the aircraft back to houston with gear down and no pins.

Original NASA ASRS Text

Title: B737 CREW HAD THE R MAIN GEAR NOT SHOW DOWN AND LOCKED.

Narrative: DURING THE APCH INTO MFE, UPON LNDG GEAR EXTENSION, CREW NOTED UNSAFE R MAIN GEAR. EXECUTED GAR, FO REFERRED TO QRH AND PERFORMED CHKLIST PROC FOR UNSAFE LNDG GEAR INDICATION. CHKLIST COMPLETED, GEAR INDICATED 3 DOWN AND LOCKED. UNEVENTFUL LNDG PERFORMED. THE TWR ADVISED TO FLY DOWN THE RWY AND THEY WOULD CHK THE GEAR. THE RED GEAR LIGHT WAS ON AND THE WARNING HORN SOUNDED WHEN THE THROTTLE WAS RETARDED. I WAS 99% SURE THE GEAR WAS NOT DOWN, BUT WANTED ANOTHER OPINION. THE TWR ADVISED THE GEAR WAS NO DOWN. THE MISSED APCH IS CLB TO 1500 FT AND TURN L TO 2000 FT AND DIRECT TO MISSI. DURING THE TURN, I ADVISED TO FLT ATTENDANT TO PREPARE FOR A POSSIBLE EMER LNDG. WE COMPLETED THE MANUAL GEAR EXTENSION AND THE GEAR INDICATED DOWN AND LOCKED, THE HORN DID NOT SOUND. WE ADVISED THE TWR WE WANTED TO RETURN. WE MADE A NORMAL LNDG. 2 HRS LATER WE FLEW THE ACFT BACK TO HOUSTON WITH GEAR DOWN AND NO PINS.

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.