PENDLETON, OR, USA
N2711U
CESSNA 335
AT 500 FT AGL ON DEPARTURE CLIMB, WITH LNDG GEAR UNRETRACTED, PLT FELT VIBRATIONS SIMILAR TO ROUGH-RUNNING ENGINE BUT NOTED NO INSTRUMENT INDICATIONS, THROTTLED BACK AND LEVELED OFF. WHILE TROUBLE-SHOOTING PROBLEM, PLT NOTED ACFT WAS DESCENDING AT 1200 FPM, ADDED PWR BUT VIBRATION INCREASED SO PLT REDUCED PWR, CONCENTRATED ON MAINTAINING 'BLUE-LINE' SPD (105 KNOTS), AND ALLOWED ADFT TO CONTRACT LEVEL SNOW-COVERED TERRAIN IN LEVEL ATTITUDE, GEAR DOWN, FLAPS UP, AT SPEED IN EXCESS OF 105 KNOTS. TEAR-DOWN OF ENGINES AND PROPS REVEALED NO PRE-IMPACT MECHANICAL FAILURE OR MALFUNCTION. BOTH FUEL SELECTORS WERE FOUND TO CONTAIN WATER. ACFT HAD HISTORY OF WATER IN FUEL SYSTEM. FUEL FILLER GAP INNER 'O' RINGS FOUND TO BE EXCESSIVELY WORN AND NO LONGER SEALING
Source: NTSB Aviation Accident Database
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