срочно!!! газотурбины, lean-lean and/or extended lean-lean modes combust.

[Ponyweaponz]

Continuous and extended operation in lower combustion modes (lean-lean and/or extended lean-lean modes for DLN-1, DLN-1+, DLN 2.0 and sub-piloted premix and/or extended sub-piloted premix, piloted premixed and/or extended piloted premix modes for DLN 2+) is not encouraged due to their impact on combustion hardware life.

Помогите плиз перевести:
lean-lean and/or extended lean-lean modes
extended sub-piloted premix modes
extended piloted premix modes

Всем спасибо!

[Ivanog]

http://www.proz.com/kudoz/english_to_french/engineering:_industrial/1966926-lean_lean_mode.html