12 Jun 2022: PIPER PA-24-250 — N9246K CORP LLC

12 Jun 2022: PIPER PA-24-250 (N7428P) — N9246K CORP LLC

No fatalities • Auburn, WA, United States

Probable cause

A total loss of engine power due to fuel starvation.

— NTSB Determination

Accident narrative

On June 11, 2022, about 1836 Pacific standard time, a Piper PA-24-250, N7428P, was substantially damaged when it was involved in an accident near Auburn, Washington. The pilot and passenger were not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The total flight time was about 1 hour, and the pilot reported that, about 18 nautical miles from the destination airport, he moved the fuel selector from the left main fuel tank to the right main fuel tank. About 5 miles from the airport, he completed the before-landing checklist and reduced the engine power setting to 15 inches of manifold pressure while he slowly advanced the propeller lever forward. Shortly after, the engine lost total power. The pilot immediately verified that the position of the mixture was full rich, and that the fuel boost pump was on. Simultaneously, the pilot moved the fuel selector from the right main tank to left main tank, but then decided to switch back to the right main tank, as the right tank contained more fuel. The engine briefly started, but again lost all power. The pilot initiated a forced landing to an open field, and during the landing roll, the airplane impacted a dirt berm, resulting in substantial damage to the right wing. Following the accident, the pilot powered the airplane, moved the fuel selector to the right main tank and turned the electric fuel pump on. Initially, he heard the pump cavitate, but then saw the fuel pressure gauge indicate an increase in fuel pressure. He then turned the power off and placed the fuel selector valve back in the off position. He stated that, in his visual inspection of the fuel tanks after the accident, he could not see any fuel in the left main tank, but the right main tank contained “plenty of fuel.” Postaccident examination of the airplane and engine did not reveal any preimpact mechanical anomalies. The right main fuel tank, right auxiliary tank, and left auxiliary tank all appeared full of fuel. The left main fuel tank was not breached and contained about one gallon of fuel. The fuel system was traced from each wing tank to the carburetor through the fuel selector, which rotated normally and was unobstructed. The fuel selector was in the off detent when first viewed. Detents were felt at the fuel selector for all four positions (right and left main tanks and left and right auxiliary tanks). The fuel selector was then positioned to each tank position and fuel was seen escaping the fuel strainer/drain. The detents were audible and could be felt. The fuel supply and vent lines in both wing fuel tanks were free of obstructions. The carburetor was disassembled, and the bowl contained about 5 ounces of fuel; the metal floats were intact and undamaged. The fuel in the carburetor bowl was tested using water finding paste and no water was detected. The accelerator pump functioned when the throttle lever was actuated, and the needle valve and seat functioned when the float was moved by hand. Mechanical continuity was established throughout the engine rotating group, valvetrain, and accessory section when the crankshaft was manually rotated at the propeller. Thumb compression was achieved at all six cylinders and the valves displayed normal lift when the crankshaft was rotated. Examination of the cylinders’ combustion chambers using a lighted borescope revealed normal piston face and valve signatures, and no indications of catastrophic engine failure. Weather conditions recorded at Seattle-Tacoma International Airport (SEA), Seattle, Washington, at 1753 and 1853 (about 43 minutes before the accident and about 17 minutes after the accident, respectively) indicated that the temperature and dew point were 20°C and 9°C. A review of the carburetor icing probability chart contained in Federal Aviation Administration Special Airworthiness Information Bulletin (SAIB) CE-09-35, Carburetor Icing Prevention, indicated that based on the reported temperature and dew point around the time of the accident, the conditions were favorable for serious icing at glide power.

Contributing factors

  • Pilot
  • Fluid management

Conditions

Weather
VMC, wind 220/08kt, vis 10sm

Loading the flight search…

What you can do on Flight Finder

  • Search flights between any two airports with live fares.
  • By aircraft — pick a plane model (e.g. Boeing 787, Airbus A350) and see every route it flies from your origin.
  • Route map — click any airport worldwide to explore its destinations, or draw a radius to find nearby airports.
  • Global aviation safety — aviation accident database, 5,200+ records since 1980, with map and rankings by aircraft and operator.
  • NTSB safety feed — recent U.S. aviation accidents and incidents from the official NTSB CAROL database, updated daily.

Frequently asked questions

How do I search flights by aircraft type on FlightFinder?

Pick an aircraft model — Boeing 737, Airbus A320, A380, Boeing 787 Dreamliner and more — enter your origin airport, and FlightFinder shows every route that plane flies from there with live fares.

Which aircraft types can I filter by?

We support Boeing 737/747/757/767/777/787, the full Airbus A220/A319/A320/A321/A330/A340/A350/A380 family, Embraer E170/E175/E190/E195, Bombardier CRJ and Dash 8, and the ATR 42/72 turboprops.

Is FlightFinder free to use?

Search and schedules are free. Pro ($4.99/month, $39/year, or $99 one-time lifetime) unlocks the enriched flight card — on-time stats, CO₂ per passenger, amenities, live gate & weather — plus My Trips with push alerts.

Where does the route data come from?

Live schedules come from Amadeus, AeroDataBox and Travelpayouts. Observed routes (which aircraft actually flew a given city pair) are crowdsourced from adsb.lol ADS-B data under the Open Database License.