Narrative:

After completing the landing checklist; I was cleared to land on runway 14 by the tower. 3 green was observed by me indicating that all the gear were down and locked. No horn was ringing. My approach was normal and stabilized at 120 KTS. At touchdown in the flare at 95 KTS the 2 main gear touched down on the runway; then I lowered the nosewheel on the runway. After the nosewheel touched on the rollout on the runway; my left gear collapsed causing the aircraft to veer left abruptly; causing the aircraft to leave the runway. Brakes were applied to try maintaining directional control but were not effective. The airplane came to rest on the left side of runway 14. The mixtures were pulled immediately to shut down the engines and the shutdown checklist was performed. After exiting the aircraft; I observed damage to both propellers of the aircraft. It was resting on its belly. The right gear also collapsed after the chain of events. After vacating the aircraft; emergency personnel came to the scene. There were no injuries to myself as a result of this incident. I was the sole occupant in the aircraft. No damage was observed to the cargo that was on board the aircraft. Callback conversation with reporter revealed the following information: reporter stated that maintenance inspection revealed the downlock mechanism for the left main gear failed after a touchdown. The right gear subsequently collapsed from the soft terrain when the aircraft left the runway.

Related reports:

Google
 

Original NASA ASRS Text

Title: C-402 LEFT MAIN GEAR COLLAPSED AFTER TOUCHDOWN; AND THE PLT WAS UNABLE TO MAINTAIN DIRECTIONAL CONTROL. THE ACFT EXITED THE RWY; CAUSING THE RIGHT MAIN TO COLLAPSE.

Narrative: AFTER COMPLETING THE LNDG CHKLIST; I WAS CLRED TO LAND ON RWY 14 BY THE TWR. 3 GREEN WAS OBSERVED BY ME INDICATING THAT ALL THE GEAR WERE DOWN AND LOCKED. NO HORN WAS RINGING. MY APCH WAS NORMAL AND STABILIZED AT 120 KTS. AT TOUCHDOWN IN THE FLARE AT 95 KTS THE 2 MAIN GEAR TOUCHED DOWN ON THE RWY; THEN I LOWERED THE NOSEWHEEL ON THE RWY. AFTER THE NOSEWHEEL TOUCHED ON THE ROLLOUT ON THE RWY; MY L GEAR COLLAPSED CAUSING THE ACFT TO VEER L ABRUPTLY; CAUSING THE ACFT TO LEAVE THE RWY. BRAKES WERE APPLIED TO TRY MAINTAINING DIRECTIONAL CTL BUT WERE NOT EFFECTIVE. THE AIRPLANE CAME TO REST ON THE L SIDE OF RWY 14. THE MIXTURES WERE PULLED IMMEDIATELY TO SHUT DOWN THE ENGS AND THE SHUTDOWN CHKLIST WAS PERFORMED. AFTER EXITING THE ACFT; I OBSERVED DAMAGE TO BOTH PROPS OF THE ACFT. IT WAS RESTING ON ITS BELLY. THE R GEAR ALSO COLLAPSED AFTER THE CHAIN OF EVENTS. AFTER VACATING THE ACFT; EMER PERSONNEL CAME TO THE SCENE. THERE WERE NO INJURIES TO MYSELF AS A RESULT OF THIS INCIDENT. I WAS THE SOLE OCCUPANT IN THE ACFT. NO DAMAGE WAS OBSERVED TO THE CARGO THAT WAS ON BOARD THE ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THAT MAINT INSPECTION REVEALED THE DOWNLOCK MECHANISM FOR THE LEFT MAIN GEAR FAILED AFTER A TOUCHDOWN. THE RIGHT GEAR SUBSEQUENTLY COLLAPSED FROM THE SOFT TERRAIN WHEN THE ACFT LEFT THE RWY.

Data retrieved from NASA's ASRS site as of January 2009 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.