Amateur-built RV10 N910BW accident near Palatka, Florida

Probable cause

Total loss of engine power due to the improper installation of an electronic ignition system connector plug.

NTSB analysis

Shortly after takeoff, the experimental amateur-built airplane’s engine lost total power and the pilot made an off-airport forced landing, resulting in substantial damage to the fuselage, both wings, and the tail section. Postaccident examination of the engine revealed that a cannon plug-type circular connector that connected the engine’s electronic ignition system’s wire harness to the two electronic control units was not properly connected. The manufacturer of the ignition system stated that disengagement of the connector, which carried all electrical signals required to run the ignition system, “…would result in a single point failure of the entire ignition system.” Maintenance records showed that the ignition system had been installed about 21 months before the accident, with no other work to that system detailed between that time and the accident. Based on this information, it is likely that the connector had not been fully secured when the system was installed, and that over time, the partial connection had loosened, ultimately resulting in the loss of engine power.

Text from the NTSB. Open the NTSB docket for ERA22LA322 for the full record.