ACR MLG HAD CTL PROBLEM ON SHORT FINAL. AFTER LNDG DISCOVERED PRIMARY SYS HYD FAILURE CAUSED BY FAILURE OF SPOILER ACTUATOR.

Narrative

AT APPROX 100 FT AGL ON FINAL APCH ACFT YAWED ABRUPTLY TO L WITH L WING DROPPING. ACFT WAS REALIGNED WITH RWY AND A RATHER ABRUPT LNDG WAS MADE. DURING EXIT FROM RWY TO TAXIWAY GOING THROUGH APPROX 30 DEGS OF R TURN NOSE WHEEL STEERING WAS LOST. ACFT HAD EXPERIENCED A HYD FAILURE. ACFT WAS TOWED TO GATE WITHOUT FURTHER INCIDENT. MAINT FOUND THAT #1 GND SPOILER HYD ACTUATOR HAD COME APART (SEPARATED) FROM AIR FRAME AND WAS NO LONGER ATTACHED TO ACFT. ACTUATOR HYD CYLINDER HAD SEPARATED FROM FLANGE WHERE IT ATTACHES TO AIR FRAME OR FLT CTL SURFACE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CALLBACK CONVERSATION REVEALED THAT THE SURFACE WIND CONDITION WAS CALM WIND WITH TEMP IN LOW 60'S AND NOT A CONDITION TO CAUSE THE WING TO DROP. THE ACFT WAS ON TARGET SPD IN A NORMAL APCH ATTITUDE WHEN THE WING WENT DOWN AND THE ACFT YAWED L. THE RPTR SAID HE USED RUDDER TO ALIGN THE ACFT AND BRING THE WING UP AND THE LNDG THOUGH 'ABRUPT' WAS NOT HARD ENOUGH TO WRITE UP AS A HARD LNDG OR TO CAUSE THE TYPE OF HYD ACTUATOR FAILURE THAT WAS DISCOVERED. THERE WAS AN FAA INSPECTOR ON BOARD AT THE TIME BUT HE WAS NOT AN ACI. HE DID DISCUSS THE PROBLEM WITH THE FLC BUT THIS WAS BEFORE THE BROKEN ACTUATOR WAS DISCOVERED DURING POST-FLT INSPECTION. THE RPTR DOES NOT THINK HE WOULD HAVE BEEN ABLE TO MAKE A SUCCESSFUL GAR BECAUSE OF THE FLAP POS AND POSSIBLE CTL PROBLEMS. A COMPANY RPT WAS FILED BUT THERE HAS BEEN NO RESPONSE AT THIS TIME. THE HYD ACTUATOR CAME APART MUCH LIKE THE CAP COMES OFF A BALL POINT PEN. ONE END SEPARATED CAUSING THE FAILURE AND LOSS OF HYD FLUID FROM THE PRIMARY SYS.