B 737 eng bleed
Thread Starter
Joined: Nov 2003
Posts: 34
Likes: 0
From: Somewhere out there
B 737 eng bleed
Can an engine be started with the engine bleed engine switch in the OFF position?
Why would you be asked this question, because the bleed air valve is signaled closed from the start valve durring engine start anyway.
Any thoughts?
GTM
Why would you be asked this question, because the bleed air valve is signaled closed from the start valve durring engine start anyway.
Any thoughts?
GTM
Joined: Apr 2004
Posts: 775
Likes: 2
From: near EDDF
It does not matter, if bleed SW is ON or OFF.
As you can see in the bleed schematic below, the duct to the starter is upstream of the PRSOV.
At 737NG you are right with closing signal from the (not closed) start VLV.
But at the 737CL the closing signal comes from the start SW when he is in GRD position.
B737CL
Ingo
As you can see in the bleed schematic below, the duct to the starter is upstream of the PRSOV.
At 737NG you are right with closing signal from the (not closed) start VLV.
But at the 737CL the closing signal comes from the start SW when he is in GRD position.
B737CL
Ingo
