Originally Posted by
Emmerson Bigs
Do tell..... the tin foil bandits?
When I was on the 777, it was maintenance. They do it so they don't have to clean the ovens. The bottom shelf covered in foil keeps food from dripping on the bottom of the oven.
Personally, I used to remove the foil every time I saw it.
Like the OP said, it's a convection oven. It does not work if the air cannot circulate. The holes exist to facilitate the air circulation.