What is F.O.D?

Lol

Wow!!!...that is the biggest piece of FOD I have ever seen!!!

I wonder why the groud crew didn't notice it laying around??...he..he!

This is FOD:

Ponch, anything not air that goes in an intake is FOD...rocks, paper, screaming FOD, etc. More specifically John P, you become the FOD. Also, said items on the ground, whether or not an aircraft is around is FOD. Plenty of injuries are caused by objects blown by jet exhaust or prop wash. Summary, FOD bad!

In the continual evolution of the English language, "FOD" has become a verb as well. Anything sucked into an intake is said to have been "fodded." Our company training guy (I'm at ITT Avionics ) gets to spend time at air bases and carriers, and occasionally says things like "I heard an engine spool up behind me and I thought I was gonna get fodded!"

Foreign Object Damage
The first production MiG 29's had louvered doors above the engines and ramps that blocked the engine air intakes that prevented FOD ingestion .
Air was sucked in through the upper doors while taxying and when the MiG was on the runway the engine ramps were raised and the upper doors closed for take off.

Sweet! Thanks a lot for the explanation.

F.O.D stands for Foreign Object Damage.

If you see a photo from the front of a MiG-29 (I think this is also true for Su-27s) as it lines up un the runway for take off, you'll notice that the intakes appear to be blocked off. Those blockages are F.O.D. screens to keep the engines from sucking up any debris on the ground and getting damaged by it.

Once the aircraft is up of the ground, those screens retract flush against the roof of the intake duct, they return to the down position at landing.

When the F.O.D screens are down, theres a series of auxiliary air inlets on the top side of the wing leading edge extensions, just aft of the cockpit, that open up to compensate for the reduced airflow directly into the intakes at take offs and landings due to the screens being in place.

Hope that clears it up for you.

FOD is Foreign Objects and Debris (or Foreign Object Damage). A FOD detail set would include the FOD screen(s) for the aircraft. FOD screens are a wire mesh screen put over the intake of a gas turbine (jet) engine to keep them from sucking things in.