Originally Posted by
User7861
Excuse me if this was already mentioned before, but I have to ask:
Nobody seems to be disturbed about the fact that the Unreliable Airspeed memory items include two performance settings only, and none of those are suitable for an initial climb after take off.
80% 10 degress pitch is the one with flaps extended and gear up. Starting actions at 400 AGL would mean that somewhere around 1000' these values would be set if I happened to follow the memory items without thinking.
So then what? What about high terrain and MSA?
Why is there no initial thrust and pitch setting for take off?
My personal game plan would be to keep the take off thrust and an initial pitch somewhere 14-16 degrees up until MSA or in case of VMC to an altitude where I'm absolutely sure that there will be no terrain threat, then set the 80% 10 deg.
Can anybody here show me what am I missing? Is there any of you here, who would consider setting that pitch and power right after take off? Is there even any data about the actual climb rate at MTOW for that setting?
I can’t speak for the 737 as I don’t fly it but I fly the 787 with a similar procedure.
Like everything else, common sense and airmanship. Boeing (or Airbus, etc) can’t write a procedure for every possible circumstance (weight, altitude, temperature, terrain) so if one or more of those items precludes you from setting 10 degrees/80% then stick with take-off power/15 degrees or so until you are clear of any threats then go to the recommended values.