2. могут. так, например, происходит с Ф-14А. Если замечал, то даже в модели сопла даются в разном положении. Это, насколько я помню сейчас, происходит изза разницы во времени остановки двигателей и работы электросистемы.

"A very typical parked stance of the F-14A engine exhausts has one side wide open and the other side fully closed. What happens is this. While taxiing, both engines are fully open. When the first engine is shut down, the aircraft is still powered by the second engine. The flight control computer cycles the shut down engine exhaust fully closed in a attempt to increase thrust. When the second engine is shut down, no power is available any more and the second engine remains fully open. The operating mechanism on the F-14A engine exhausts is not effected by gravity, so the exhausts remain in whatever position they are in at shut down.

If both engines are fully open (on a parked F-14A), it means they were shut down pretty much at the same time. It is rare to find both engines fully closed on the ground.

On the F-14A+/B and D Tomcat, the typical parked stance of the engine exhausts is to have both exhausts wide open. The same operational behavior occurs to the engine exhausts that occurs on the F-14A. The difference is that the operating mechanism of the engine exhausts on the F-14A+/B and D is very much effected by gravity. Within minutes after shut down, the engine exhausts are pulled open by gravity."