Narrative:

Post flight inspection showed a failure of the engine mount at stearing cam mount, causing a lack of steering ability following normal landing. I was giving dual instruction in an small aircraft aircraft at sanderson airport in shelton, wa. After departing clover park (S-37) airport, the 15 min flight to sanderson displayed no abnormalities in the aircraft. The first two lndgs were uneventful. The aircraft was responsive to control input and handled in a normal manner. No abnormalities were apparent on landing or takeoff roll. On the third landing after a normal roll out of 4 to 5 seconds the aircraft made a slight movement to the left then immediately made a violent hard turn to the right. The aircraft was uncontrollable from the start of the right turn. Use of rudder was not effective. The aircraft continued to the right, skidding until the left main gear collapsed. Once the left main gear collapsed, the aircraft continued to the right stopping on the side of the runway. The engine was shut down before the aircraft came to a full stop, and all other equipment was shut down after aircraft stoppage. No physical injury occurred to myself or student.

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Original NASA ASRS Text

Title: NOSE WHEEL STEERING CONTROL FAILED AFTER NORMAL LNDG CAUSING UNCONTROLLABLE TURN, LNDG GEAR COLLAPSE, AND EXCURSION FROM RWY.

Narrative: POST FLT INSPECTION SHOWED A FAILURE OF THE ENG MOUNT AT STEARING CAM MOUNT, CAUSING A LACK OF STEERING ABILITY FOLLOWING NORMAL LNDG. I WAS GIVING DUAL INSTRUCTION IN AN SMA ACFT AT SANDERSON ARPT IN SHELTON, WA. AFTER DEPARTING CLOVER PARK (S-37) ARPT, THE 15 MIN FLT TO SANDERSON DISPLAYED NO ABNORMALITIES IN THE ACFT. THE FIRST TWO LNDGS WERE UNEVENTFUL. THE ACFT WAS RESPONSIVE TO CTL INPUT AND HANDLED IN A NORMAL MANNER. NO ABNORMALITIES WERE APPARENT ON LNDG OR TKOF ROLL. ON THE THIRD LNDG AFTER A NORMAL ROLL OUT OF 4 TO 5 SECS THE ACFT MADE A SLIGHT MOVEMENT TO THE L THEN IMMEDIATELY MADE A VIOLENT HARD TURN TO THE R. THE ACFT WAS UNCONTROLLABLE FROM THE START OF THE R TURN. USE OF RUDDER WAS NOT EFFECTIVE. THE ACFT CONTINUED TO THE R, SKIDDING UNTIL THE L MAIN GEAR COLLAPSED. ONCE THE L MAIN GEAR COLLAPSED, THE ACFT CONTINUED TO THE R STOPPING ON THE SIDE OF THE RWY. THE ENG WAS SHUT DOWN BEFORE THE ACFT CAME TO A FULL STOP, AND ALL OTHER EQUIP WAS SHUT DOWN AFTER ACFT STOPPAGE. NO PHYSICAL INJURY OCCURRED TO MYSELF OR STUDENT.

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.