07/07/2026
https://www.facebook.com/share/1GPgPBf56Y/?mibextid=wwXIfr
On July 26, 2018, a pilot preflighting his Cessna 182 at Cleveland Regional Jetport had his ignition key in his pocket, and the engine still started. The switch wasn't fully in the OFF position. It was caught in an intermediate position between OFF and RIGHT, just enough to leave the right magneto's P-lead ungrounded. The prop came around without warning. The pilot did not survive.
That key-operated ignition switch in most single-engine pistons isn't as safe as it looks. There are two designs in widespread use, each with different failure modes and ADs, but one failure mode is not addressed by any of those ADs.
The takeaway is simple: treat the magnetos as hot, always, regardless of where the switch is or whether the key is in your pocket. This goes for your mechanics too. A significant number of prop-strike incidents happen on the ground during maintenance, because someone assumed the mags were safe.
Read the full article for more guidance: https://www.savvyaviation.com/deadly-switches/