A decade or two ago an accident like this would have fallen into the 'for unknown reasons' category. [Credit: Leonardo Correa Luna]
Key Takeaways:
An experienced pilot died in an M35 Bonanza crash, with the NTSB attributing the cause to the pilot's mismanagement of the airplane's fuel system.
The Bonanza's complex fuel system features a vapor return mechanism that sends unused fuel to the left main tank, which can rapidly deplete auxiliary tanks and lead to fuel venting overboard if the main tank is full.
During the return flight, the pilot switched to the auxiliary tanks, which quickly ran dry due to the vapor return dynamics, causing fuel pressure loss and subsequent engine failure at a critical phase of flight.
The incident highlights the crucial importance for pilots to thoroughly understand the specific quirks and operating procedures of an aircraft's systems, particularly when flying an unfamiliar model or configuration like one with auxiliary fuel tanks.
On a Friday evening early in January 2023, an Arkansas pilot died in the crash of his M35 Bonanza.
The airplane, manufactured in 1960, had been updated with, among other things, a couple of flight data recorders. Their memory cards survived the crash and allowed National Transportation Safety Board (NTSB) investigators to trace in minute detail the events that led to it.
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Peter Garrison taught himself to use a slide rule and tin snips, built an airplane in his backyard, and flew it to Japan. He began contributing to FLYING in 1968, and he continues to share his columns, ""Technicalities"" and ""Aftermath,"" with FLYING readers.
