What was found
ELEVATOR TRIM INDICATOR ARM FREQUENTLY BECOMES MISINDEXED GIVING ERRONEOUS TRIM SETTING INDICATIONS. A PILOT'S KNEE, RESTING AGAINST THE TRIM WHEEL, CAN DISPLACE THE WHEEL ENOUGH TO CAUSE THE TRIM ARM TO MOVE OUT OF THE SPIRAL GROOVE AND INTO ANOTHER GROOVE. AN IDENTICAL PROBLEM OCCURS IN THE OTHER COMPANY OWNED 310R. THE TRIM WHEEL AND ATTACHING PARTS ARE TIGHT AND IN GOOD CONDITION. APPROVED PREVENTATIVE ACTIONS ARE NOT APPARENT.