Narrative:

While on downwind for landing at molokai airport following a normal takeoff from lup, I noticed the right main gear indicator light was not illuminated after placing the gear handle down. Upon checking the gear horn and finding that it also sounded upon throttle reduction, I elected to do a flyby the tower before taking further action. Tower indicated the gear (all) appeared down. I elected to depart the pattern at molokai and return VFR to honolulu due to the probability that the gear indicated unsafe and because of the facs available at hnl. I flew back with the gear extended and accomplished the gear malfunction checklist. The gear still indicated unsafe--the warning horn sounded on throttle reduction and the bulb checked normal. I briefed the passenger prior to landing of the possibility of an emergency egress after landing, declared an emergency with hnl approach control after closing my flight plan with hnl FSS. On flyby at hnl, tower indicated the gear (all) appeared down, so I asked for and was cleared to land on runway 4R. I made a normal approach lighted up on the left side of the runway (to compensate for the drag if the gear collapsed). I landed left main first and on roll out felt the right main starting to fold. I was able to hold the right wing up through most of the rollout and then prior to losing ctlability, gently lowered the right main to the runway where it continued to fold. The landing was smooth and ctlable until the last few ft when the aircraft veered slightly right coming to a stop. I shutdown the engines (leaving the propellers forward) an helped the passenger out of the aircraft. No one was injured. Maintenance determined that main landing gear drag brace pivot pin sheared resulting in support arm failure which caused gear to extend but not lock. Crash support and emergency handling by tower was excellent.

Related reports:

Google
 

Original NASA ASRS Text

Title: DRAG BRACK PIVOT PIN IN RIGHT MAIN GEAR OF COMMUTER SMT SHEARED PREVENTING GEAR FROM LOCKING IN THE DOWN POSITION. GEAR COLLAPSED ON LNDG.

Narrative: WHILE ON DOWNWIND FOR LNDG AT MOLOKAI ARPT FOLLOWING A NORMAL TKOF FROM LUP, I NOTICED THE RIGHT MAIN GEAR INDICATOR LIGHT WAS NOT ILLUMINATED AFTER PLACING THE GEAR HANDLE DOWN. UPON CHKING THE GEAR HORN AND FINDING THAT IT ALSO SOUNDED UPON THROTTLE REDUCTION, I ELECTED TO DO A FLYBY THE TWR BEFORE TAKING FURTHER ACTION. TWR INDICATED THE GEAR (ALL) APPEARED DOWN. I ELECTED TO DEPART THE PATTERN AT MOLOKAI AND RETURN VFR TO HONOLULU DUE TO THE PROBABILITY THAT THE GEAR INDICATED UNSAFE AND BECAUSE OF THE FACS AVAILABLE AT HNL. I FLEW BACK WITH THE GEAR EXTENDED AND ACCOMPLISHED THE GEAR MALFUNCTION CHKLIST. THE GEAR STILL INDICATED UNSAFE--THE WARNING HORN SOUNDED ON THROTTLE REDUCTION AND THE BULB CHKED NORMAL. I BRIEFED THE PAX PRIOR TO LNDG OF THE POSSIBILITY OF AN EMER EGRESS AFTER LNDG, DECLARED AN EMER WITH HNL APCH CTL AFTER CLOSING MY FLT PLAN WITH HNL FSS. ON FLYBY AT HNL, TWR INDICATED THE GEAR (ALL) APPEARED DOWN, SO I ASKED FOR AND WAS CLRED TO LAND ON RWY 4R. I MADE A NORMAL APCH LIGHTED UP ON THE LEFT SIDE OF THE RWY (TO COMPENSATE FOR THE DRAG IF THE GEAR COLLAPSED). I LANDED LEFT MAIN FIRST AND ON ROLL OUT FELT THE RIGHT MAIN STARTING TO FOLD. I WAS ABLE TO HOLD THE RIGHT WING UP THROUGH MOST OF THE ROLLOUT AND THEN PRIOR TO LOSING CTLABILITY, GENTLY LOWERED THE RIGHT MAIN TO THE RWY WHERE IT CONTINUED TO FOLD. THE LNDG WAS SMOOTH AND CTLABLE UNTIL THE LAST FEW FT WHEN THE ACFT VEERED SLIGHTLY RIGHT COMING TO A STOP. I SHUTDOWN THE ENGS (LEAVING THE PROPS FORWARD) AN HELPED THE PAX OUT OF THE ACFT. NO ONE WAS INJURED. MAINT DETERMINED THAT MAIN LNDG GEAR DRAG BRACE PIVOT PIN SHEARED RESULTING IN SUPPORT ARM FAILURE WHICH CAUSED GEAR TO EXTEND BUT NOT LOCK. CRASH SUPPORT AND EMER HANDLING BY TWR WAS EXCELLENT.

Data retrieved from NASA's ASRS site as of August 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.