What happened
On March 20, 2026, a private Cessna A188B aircraft, registered as LV-ZSP, was operating a non-scheduled relocation flight within Argentina. The flight departed from one eventual airfield and was en route to another when the incident occurred. The pilot-in-command, a male holding a private pilot license, was conducting the operation under Visual Meteorological Conditions (VMC) during daylight hours.
The aircraft was equipped with a Teledyne Continental IO-520 engine and a McCauley propeller system. During the cruise phase of the flight, the propeller governor experienced a malfunction that caused the blades to shift unexpectedly to a fine-pitch attitude. This mechanical failure drastically altered the aircraft's performance characteristics, leaving the pilot with insufficient time or altitude to recover normal flight parameters.
Faced with this critical in-flight emergency, the pilot attempted an immediate forced landing. The aircraft impacted the ground approximately 30 meters from the intended aerodrome area. The terrain at the impact site was described as level and flat, covered with sand and tall vegetation. The crash occurred at a speed of 75 knots with the aircraft in a nose-level, wings-level attitude.
The pilot managed to escape the wreckage three minutes after the impact. However, despite surviving the initial collision, the pilot sustained fatal injuries. There were no injuries reported on the ground. The aircraft suffered substantial damage and was destroyed.
The investigation
The Argentine Transportation Safety Board (JST) conducted a preliminary inquiry into the accident. Investigators examined the flight data, maintenance records, and the physical wreckage. The aircraft had a total of 3,144.5 flight hours and was currently airworthy with valid documentation prior to the event.
Key technical details reviewed included:
- The engine (Teledyne Continental IO-520) had accumulated 3,182.5 hours.
- The propeller (McCauley D2A34C58-NO) had accumulated 3,173.8 hours and was within its service limits.
- The emergency locator transmitter (ELT) was not carried on board.
The investigation focused heavily on the propeller control system, specifically the governor mechanism. Analysis of the failure mode indicated that the propeller blades were forced into a fine-pitch position by the malfunctioning governor. This condition would have caused a sudden and severe loss of thrust or a drastic change in engine RPM, making controlled flight impossible.
Findings
The primary causal factor was identified as a powerplant failure related to the propeller system. Specifically:
- LV-ZSP experienced a malfunction in the propeller governor.
- This malfunction caused an uncommanded shift to fine pitch.
- The resulting loss of control forced the pilot to execute an emergency landing.
- The crash resulted in 1 fatality among the crew.
The investigation confirmed that the mechanical failure of the propeller control system was the decisive event leading to the accident. No other contributing factors, such as weather or maintenance errors, were cited as primary causes.
Safety action
The JST report highlights the critical role of the propeller governor in engine performance. The incident underscores the importance of regular inspection of propeller control systems to prevent in-flight failures. While no specific new regulatory actions are detailed in this preliminary summary, the findings serve as a safety warning regarding the reliability of aging governor mechanisms in small aircraft operations.