Engine start-idle thrust
Thread Starter
Joined: Aug 2001
Posts: 755
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From: Europe-the sunshine side
Engine start-idle thrust
HY. I wonder if you know anything about a minimum required time to keep the engine at idle trust before advancing the engines at takeoff thrust?
On our books for CFM on 737 says nothing on this subject.
What about the airbus engines?
I know it is not usual to start the engines and takeoff in 1-2 min,but just from a technical point of view?
Brgds Alex
On our books for CFM on 737 says nothing on this subject.
What about the airbus engines?
I know it is not usual to start the engines and takeoff in 1-2 min,but just from a technical point of view?
Brgds Alex
Joined: Oct 2002
Posts: 30
Likes: 0
From: UK
Hi
On our V2500 equiped A320s, the rule is if the aircraft hasn't flown for two hours or more then they need 5 minutes at idle before applying takeoff power. And after landing they need two minutes at idle before shutdown.
Hope that helps
Santan
On our V2500 equiped A320s, the rule is if the aircraft hasn't flown for two hours or more then they need 5 minutes at idle before applying takeoff power. And after landing they need two minutes at idle before shutdown.
Hope that helps
Santan
Joined: Jan 1999
Posts: 187
Likes: 1
From: hongkong
Our V2500's need 3 mins at idle thrust after landing and 3 mins before take-off if less than 2 hrs on ground. We are the same as Santan on the 5 mins if time on ground greater than 2 hrs.
Understand RR Trents for example are very different (3 spools = quicker heat equalisation?)
Understand RR Trents for example are very different (3 spools = quicker heat equalisation?)
Joined: Jan 2002
Posts: 960
Likes: 0
From: Brisbane, Australia
Hi alexban,
my understanding with the B737NG CFM56-7 engine is that,
when the OAT is -35 to -40 degC, the engine is to be held at idle for two minutes.
Then an overall statement that says that anytime the engine oil pressure is outside the normal operatiung range, stay at idle.
Then, after landing, the normal cooldown time should be three minutes, but if its absolutely needed, one will suffice.
After 3 or more hours cold soak at -40 or less, do not start or motor until maintenance has done their procedure with the starter.
hope this helps,
FD
my understanding with the B737NG CFM56-7 engine is that,
when the OAT is -35 to -40 degC, the engine is to be held at idle for two minutes.
Then an overall statement that says that anytime the engine oil pressure is outside the normal operatiung range, stay at idle.
Then, after landing, the normal cooldown time should be three minutes, but if its absolutely needed, one will suffice.
After 3 or more hours cold soak at -40 or less, do not start or motor until maintenance has done their procedure with the starter.
hope this helps,
FD
