This worries me. I hope there are strict security measures regarding those in charge of maintaining. I’ve never heard of something like this happening on a presidential plane. I could be wrong though.
Don’t be shocked if this continues....
Its NOT smoke. IMHO its toxic fumes from leaking hydraulic fluid on the hot surface of one of the engines. The hyd. fluid has a anti-wear additive in it that when heated to high temps produces fumes that are drawn into the cabin air system.
Exposure to these fumes can cause severe neurological problems.