What is nominal n1 and fuel flow behavior during cruise climb?
Thread Starter
Join Date: Nov 2019
Location: usa
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
What is nominal n1 and fuel flow behavior during cruise climb?
For a commuter airliner (e.g. 737) performing a cruise climb (step climb) at a constant Mach, how should n1 and fuel flow behave?
I know that fuel flow should decrease with altitude (air fuel ratio). Should fuel flow also decrease with weight (fuel burn off)?
Is n1 kept constant? Does it decrease with weight? Is it unaffected by altitude?
If it depends, then what systems (fadec?) or settings (rated/non-rated mode?) are responsible for setting the behavior.
I know that fuel flow should decrease with altitude (air fuel ratio). Should fuel flow also decrease with weight (fuel burn off)?
Is n1 kept constant? Does it decrease with weight? Is it unaffected by altitude?
If it depends, then what systems (fadec?) or settings (rated/non-rated mode?) are responsible for setting the behavior.
Join Date: Apr 2012
Location: In Space
Posts: 683
Likes: 0
Received 0 Likes
on
0 Posts
Actually the fuel flow will increase as the engines spool up to climb power. However, the fuel flow will decrease with the weight if comparing two different AC weights in the same condition.
N1 CLB power will increase with altitude due to the air being less dense at altitude.
N1 CLB power will increase with altitude due to the air being less dense at altitude.