Narrative:

Immediately after T/D on landing the aircraft started listing to the right. The captain maintained directional control. The cockpit crew initially suspected a deflated main strut and ground handling was good. The decision was made to turn onto the taxiway. After exiting the runway it was determined visually that the right main gear had partially collapsed even though all cockpit gear down and lock indications and hydraulic systems were normal. After letting the aircraft roll to a stop, passenger were deplaned through the main airstair door onto the ramp west/O incident or problems and no injuries. Gear partially collapsed due to a broken lock strut. Damage was minor. Gear apparatus and some skin damage on rear belly of aircraft. Area where second guessing or monday morning quarterbacking may occur. Captain's decision to delay stopping aircraft and for passenger evacuate/evacuation was made because mechanical situation did not seem as serious initially and because, with aircraft under control on the ground consideration for passenger safety, given the remote uncontrolled airport at night and the risks involved in a premature emergency evacuate/evacuation. When the fact was known that a more serious gear problem existed, the crew decided to keep engines on the right side operating ot provide hydraulic system pressure in case that was assisting to hold gear in place, and at the same time evacuate/evacuation passenger, but do it safely considering those operating engines and a tilted aircraft. Knowing the full situation at the time might have changed or reinforced decisions made by crew. Supplemental information from acn 102379: there were no unusual sounds noticeable from the cockpit. We were listing to the right, the tail was slightly low, and the cockpit indications remained normal. The cause of our listing could not be determined, however I was able to see that the right main gear had partially collapsed, and that the tires were on the ground. The runway and ramp conditions were snowpacked and icy.

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Original NASA ASRS Text

Title: COMMUTER MDT PARALLEL MAIN GEAR COLLAPSE AFTER LNDG. ALL COCKPIT INDICATIONS NORMAL BEFORE AND AFTER THE INCIDENT.

Narrative: IMMEDIATELY AFTER T/D ON LNDG THE ACFT STARTED LISTING TO THE RIGHT. THE CAPT MAINTAINED DIRECTIONAL CONTROL. THE COCKPIT CREW INITIALLY SUSPECTED A DEFLATED MAIN STRUT AND GND HANDLING WAS GOOD. THE DECISION WAS MADE TO TURN ONTO THE TXWY. AFTER EXITING THE RWY IT WAS DETERMINED VISUALLY THAT THE RIGHT MAIN GEAR HAD PARTIALLY COLLAPSED EVEN THOUGH ALL COCKPIT GEAR DOWN AND LOCK INDICATIONS AND HYD SYSTEMS WERE NORMAL. AFTER LETTING THE ACFT ROLL TO A STOP, PAX WERE DEPLANED THROUGH THE MAIN AIRSTAIR DOOR ONTO THE RAMP W/O INCIDENT OR PROBS AND NO INJURIES. GEAR PARTIALLY COLLAPSED DUE TO A BROKEN LOCK STRUT. DAMAGE WAS MINOR. GEAR APPARATUS AND SOME SKIN DAMAGE ON REAR BELLY OF ACFT. AREA WHERE SECOND GUESSING OR MONDAY MORNING QUARTERBACKING MAY OCCUR. CAPT'S DECISION TO DELAY STOPPING ACFT AND FOR PAX EVAC WAS MADE BECAUSE MECHANICAL SITUATION DID NOT SEEM AS SERIOUS INITIALLY AND BECAUSE, WITH ACFT UNDER CTL ON THE GND CONSIDERATION FOR PAX SAFETY, GIVEN THE REMOTE UNCONTROLLED ARPT AT NIGHT AND THE RISKS INVOLVED IN A PREMATURE EMER EVAC. WHEN THE FACT WAS KNOWN THAT A MORE SERIOUS GEAR PROB EXISTED, THE CREW DECIDED TO KEEP ENGS ON THE RIGHT SIDE OPERATING OT PROVIDE HYD SYS PRESSURE IN CASE THAT WAS ASSISTING TO HOLD GEAR IN PLACE, AND AT THE SAME TIME EVAC PAX, BUT DO IT SAFELY CONSIDERING THOSE OPERATING ENGS AND A TILTED ACFT. KNOWING THE FULL SITUATION AT THE TIME MIGHT HAVE CHANGED OR REINFORCED DECISIONS MADE BY CREW. SUPPLEMENTAL INFO FROM ACN 102379: THERE WERE NO UNUSUAL SOUNDS NOTICEABLE FROM THE COCKPIT. WE WERE LISTING TO THE RIGHT, THE TAIL WAS SLIGHTLY LOW, AND THE COCKPIT INDICATIONS REMAINED NORMAL. THE CAUSE OF OUR LISTING COULD NOT BE DETERMINED, HOWEVER I WAS ABLE TO SEE THAT THE RIGHT MAIN GEAR HAD PARTIALLY COLLAPSED, AND THAT THE TIRES WERE ON THE GND. THE RWY AND RAMP CONDITIONS WERE SNOWPACKED AND ICY.

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.