Narrative:

The problem started when we selected landing gear down. There was a loud bang. We had lost hydraulic pressure and other related control functions. We climbed up to 12000 ft and proceeded to home base. During the return flight we lost roll control of the aircraft for about 20 mins. I declared an emergency and was going to land at ZZZ. I regained roll control and proceeded to home base and landed without any trouble. Callback conversation with reporter revealed the following information: the reporter stated the cause of this incident was the failure of the gear extend and retract actuator cylinder end, which allowed the piston to extend beyond normal limits. The reporter said the piston contacted, and severed, an auxiliary hydraulic line and pinched an aileron control cable turnbuckle. The reporter stated,when aileron control was recovered, it still had a stiff or slight interference at one point of wheel rotation. The reporter said this type of failure was most common with sabreliners used in the military service and not seen too often in sabreliners operated in commercial aviation. Supplemental information from acn 523210: we decided to take the 45 mins needed to return to home base in order to burn fuel and reduce our landing speed. No further problems occurred during our flight back to base. We requested fire and rescue at AAA in the event we could not stop the aircraft on the runway. We were granted a low pass over the tower to give people on the ground a chance to verify that our wheels and landing gear looked normal before we attempted a landing. With that done, and all abnormal checklists completed and discussed between myself and the captain, we continued the approach to lnd. Upon touchdown, thrust reversers and emergency brakes were applied and the aircraft came to a safe stop. Company maintenance personnel determined that there was a total landing gear accuator failure on the right side, which resulted in loss of hydraulic fluid, and the temporary pinching of the flight control cable lines.

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Original NASA ASRS Text

Title: A SABRELINER 80SC ON APCH DECLARED AN EMER DUE TO LOSS OF MAIN AND AUXILIARY HYDRAULIC SYSTEMS AND AILERON CTL CAUSED BY FAILED R MAIN GEAR ACTUATOR.

Narrative: THE PROB STARTED WHEN WE SELECTED LNDG GEAR DOWN. THERE WAS A LOUD BANG. WE HAD LOST HYDRAULIC PRESSURE AND OTHER RELATED CONTROL FUNCTIONS. WE CLBED UP TO 12000 FT AND PROCEEDED TO HOME BASE. DURING THE RETURN FLT WE LOST ROLL CONTROL OF THE ACFT FOR ABOUT 20 MINS. I DECLARED AN EMER AND WAS GOING TO LAND AT ZZZ. I REGAINED ROLL CONTROL AND PROCEEDED TO HOME BASE AND LANDED WITHOUT ANY TROUBLE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THIS INCIDENT WAS THE FAILURE OF THE GEAR EXTEND AND RETRACT ACTUATOR CYLINDER END, WHICH ALLOWED THE PISTON TO EXTEND BEYOND NORMAL LIMITS. THE RPTR SAID THE PISTON CONTACTED, AND SEVERED, AN AUXILIARY HYDRAULIC LINE AND PINCHED AN AILERON CTL CABLE TURNBUCKLE. THE RPTR STATED,WHEN AILERON CTL WAS RECOVERED, IT STILL HAD A STIFF OR SLIGHT INTERFERENCE AT ONE POINT OF WHEEL ROTATION. THE RPTR SAID THIS TYPE OF FAILURE WAS MOST COMMON WITH SABRELINERS USED IN THE MILITARY SVC AND NOT SEEN TOO OFTEN IN SABRELINERS OPERATED IN COMMERCIAL AVIATION. SUPPLEMENTAL INFO FROM ACN 523210: WE DECIDED TO TAKE THE 45 MINS NEEDED TO RETURN TO HOME BASE IN ORDER TO BURN FUEL AND REDUCE OUR LNDG SPEED. NO FURTHER PROBS OCCURRED DURING OUR FLT BACK TO BASE. WE REQUESTED FIRE AND RESCUE AT AAA IN THE EVENT WE COULD NOT STOP THE ACFT ON THE RWY. WE WERE GRANTED A LOW PASS OVER THE TWR TO GIVE PEOPLE ON THE GND A CHANCE TO VERIFY THAT OUR WHEELS AND LNDG GEAR LOOKED NORMAL BEFORE WE ATTEMPTED A LNDG. WITH THAT DONE, AND ALL ABNORMAL CHKLISTS COMPLETED AND DISCUSSED BTWN MYSELF AND THE CAPT, WE CONTINUED THE APCH TO LND. UPON TOUCHDOWN, THRUST REVERSERS AND EMERGENCY BRAKES WERE APPLIED AND THE ACFT CAME TO A SAFE STOP. COMPANY MAINT PERSONNEL DETERMINED THAT THERE WAS A TOTAL LNDG GEAR ACCUATOR FAILURE ON THE R SIDE, WHICH RESULTED IN LOSS OF HYDRAULIC FLUID, AND THE TEMPORARY PINCHING OF THE FLT CTL CABLE LINES.

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.