I guess you mean approach phase, not face, but english isnt your first language! Good attempt.
It wont be anywhere in the manuals, but the BA 777 incident at LHR raised some awareness of the scenario of doing a long idle power continuous descent, then finding the engines wont spool up on approach.
Our company too, is encouraging a level off, or power-up before finals. More to warm the fuel heater than stabilise temps, I would have thought. Isn't that more for pistons?