kingair 200 bleed air failure

[joe north]

if you have a real bleed air failure would you also have a decrease in torque, increase in ITT with the same fuel flow?

[cessna24]

Does the bleed valve fail shut?
If not, Im only guessing that you would turn your applicable engine bleed to off and would not get any difference in engine parameters. But if the bleed is failed and you assess the problem as you say, I would imagine it would cause a decrease in torque as you are removing air from the engine.
Not sure if thats any good? :ok:
c24

[joe north]

yup thats what I was thinking, more bleed is actually suppplied from the flow pack to compensate for the extra demand on the enviro side, not sure if instrument air pipe leak would make a whole lot difference.

[cessna24]

only for the instruments.
;)
c24

[purgatore75]

If you start spilling air from the HPC in the case of an eng bleed vlv failure the turboshaft (or any gas turbine engine) surely tends to compensate this loss of air in burning more fuel ( FF rises ) in order to maintain the same Torque value, this causes a rise in ITT and as a consequence the rises of N2 so the torque lowers a little bit first then turns it back to the previous value....
Each time you ask the engine for a spill of air, you are requesting to that engine to spend more fuel to maintain the setting parameters......you want air, you don't want loss in power.