19980805019729A

Acft was on a sight seeing tour when it crashed under unknown circumstances, the pilot and one passsenger have unknown inj. The other passenger suffered fatal inj. (.4) the pilot told the NTSB investigator-in-charge (iic) during an interview on August 6, that he parked the airplane with the right wing over the dock, placed the fuel selector valve in the 'left' position to prevent fuel cross-feeding while on the water, and requested the lineman fill the right wing. He told the NTSB iic he recalled seeing the right tank fuel gauge read full, and the left tank gauge read 1/8 to 1/4 (5 gallons to 10 gallons) when he departed on the accident flight. He said he always does a 'gumps' (gas-undercarriage-mixture-prop) check prior to takeoff. The company wrote in a statement submitted to the NTSB iic on may 10, 1999, and told the NTSB iic, that the pilot did not remember placing the fuel valve to the 'left' position during fueling. After about 45 minutes of flight, and one water landing and takeoff, the engine quit while the airplane was at 800 feet MSL climbing toward rising terrain. The pilot said he turned on the electric fuel pump, but the engine did not start. He saw the fuel selector valve in the 'left' tank position. He indicated he turned the selector valve to the 'both' position, and turned the airplane 180 degrees toward lower terrain. The engine did not restart and the airplane contacted terrain. Investigation revealed fuel in the right wing tank, no fuel in the left wing tank, and one teaspoon of fuel in the intact fuel lines to the engine. Charted fuel consumption for 45 minutes at a cruise power setting of 2,300 RPM at 23 inches of manifold pressure is 9.4 gallons. The before takeoff checklist states, in part: '(6) fuel selector valve - both on, (7) fuel quantity indicators - check quantity.' The pilot stated during interviews with the NTSB, FAA, and Alaska state troopers, on August 6, and August 7, that he believed the rear seat passenger must have kicked the fuel selector valve to the 'left' position. The NTSB iic, the FAA coordinator, and the company representative, all sat in the rear seat of a representative Cessna 185 on August 8 and attempted to move the fuel selector to the 'left' position with their feet. None of them were able to move the valve further than 1 inch (12 degrees) to the left of the 'both' position. (-23) pilot failed to use check list prior to two departures. He initiated flight on the left fuel tank which had 10 to 15 gallons, the engine quit due to fuel starvation, and the aircraft subsequently crashed. The right tank was full.