NTSB: Corroded Engine Parts Caused Fatal Naples CL604 Crash

Naples, Fla. — The National Transportation Safety Board released its final report April 24, determining that corrosion in variable geometry components caused the fatal Bombardier Challenger 604 crash near Naples Municipal Airport.

Probable Cause

The NTSB concluded that corrosion in both General Electric CF34-3B engines' variable geometry system components led to their operation in an off-schedule position. This malfunction resulted in near-simultaneous sub-idle rotating compressor stalls and subsequent loss of thrust in both engines during approach. Chemical analysis indicated the corrosion elements were consistent with a marine salt or seawater environment, suggesting the aircraft had been operating in coastal areas prior to the incident.

Investigation Details

The fatal accident occurred Feb. 9, 2024, involving Hop-A-Jet Flight 823. Both pilots and one person on the ground were killed, while two passengers and a flight attendant were injured. Following the crash, the engines were shipped to General Electric for disassembly and examination. GE has since revised troubleshooting procedures for similar hung-start issues and issued service bulletins to improve inspection protocols for CF34 engines in business aviation.