Plane forced to make emergency landing after rogue wasp hits routine flight

A routine training flight turned into a terrifying emergency when a wasp-like insect blocked a fuel jet, causing violent engine vibrations and power loss just minutes after take-off

A routine flight turned into a mid-air nightmare when a rogue wasp sparked terrifying engine failures just minutes after takeoff. An insect caused a “serious incident” on board a two-seat aircraft, an investigation just revealed.

On November 8, 2024 in Estavayer-le-Gibloux, Fribourg, Switzerland, a plane found itself in trouble when severe engine vibrations suddenly struck during the climb. According to the report, published on June 2, by the Swiss Transportation Safety Investigation Board (SESE), the alarming vibrations were traced to “a wasp-like insect”.

It was partially blocking the main jet of the right carburettor, triggering a power loss. The drama unfolded aboard a two-seater DV20 Katana light aircraft.

After sailing through standard safety checks, a fully qualified pilot and instructor took off into clear blue skies from Écuvillens airfield at 3:01 PM. But just two minutes later, at 3,700 feet, the plane began violently shaking.

As the aircraft rattled, the quick-thinking instructor grabbed the controls and throttled back, which temporarily stopped the terrifying vibrations. After checking for engine ice, he tried to rev the engine again.

However, the violent shaking and power loss immediately roared back. Realising stable flight was now impossible, the crew glided the plane back toward the airfield, making a dramatic but safe emergency landing.

Focused entirely on staying alive in a frantic race against the clock, the crew didn’t even have time to radio a Mayday distress call – a move air safety investigators say should ideally always be done. The SESE’s crash investigation later unmasked the unlikely culprit: the wasp-like bug.

The creepy-crawly had sneaked into a vent line that lacked any guard or protective screen. From there, it managed to wedge itself inside the right carburettor, partially blocking the fuel flow.

With its fuel supply choked off, two of the engine’s cylinders began misfiring wildly. This threw the engine completely out of sync, triggering the violent rattling and leaving the crew just moments away from total engine failure in mid-air.

Investigators stressed the report is meant to prevent future accidents, not to pin blame on anyone. They urged regulators and manufacturers to better protect the engine’s ventilation openings, and the plane maker Diamond later issued guidance to check the vent pipes and fit a new clear filter, while engine firm Rotax said it would update its manuals to highlight keeping these parts protected from debris getting in.

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