757 Aircon pack control
A couple of flight deck procedure questions as I'm an oily engineer on a 757 course at mo and hopefully a few answers will help to explain all the different pack control modes.
1. What is the procedure for a 'ZONE' inop warning on the temp selectors?
2. Under what circumstance would you revert to using STBY pack control? which mode do you use N,C,W? and what do you notice as the difference between each?
3. Do you ever turn trim air off? Does trim air work in STBY?
Thanks in advance.