View Full Version : Jet engine warm-up time
Flughaven
30th Nov 2007, 12:02
Quick question.
Is there a minimum engine warm-up time on a CFM-56 (B738) before take off?
I'm finding it that I'm taking-off within 2 mins of engine 1 start due short taxy to runway.
My concern is now during winter time the A/C will have been standing static during the night in temps of -5 to -10 celcius, with a departure at 6.30am.
Cheers for the help.
Piltdown Man
30th Nov 2007, 12:22
For your engine I can not answer, but for a Tay (620 & 650), we give the following minimum times based on oil temperature: < +20 Celcius = 4 minutes, +20 to +30 Celcius = 3 minutes, > +30 celcius = 4 minutes.
PM
lomapaseo
30th Nov 2007, 12:33
Whatever the manual says for your specific engine instalation, all others may vary
Dream Land
30th Nov 2007, 13:20
Think 5 minutes on the V2500, and don't recall for the CFM, 50C for the oil I think. :}
FlightDetent
30th Nov 2007, 13:51
FH: I can only quote an Airbus manual, yet I believe the engine limitations are not airframe dependant:
minimum oil temperature for take-off -10° C
no other information! I seem to recall 3 minutes requirement from start-up to take-off thrust, yet couldn't find it. :yuk:
fokkerjet
30th Nov 2007, 14:00
For your engine I can not answer, but for a Tay (620 & 650), we give the following minimum times based on oil temperature: < +20 Celcius = 4 minutes, +20 to +30 Celcius = 3 minutes, > +30 celcius = 4 minutes.
Between +20c to +40c, with the Tays it's 3 minutes, and above +40c it's 2 minutes.
Your companies cold weather operating procedures should answer this.
Most of the time its a limitation based on oil temp.
Flughaven
30th Nov 2007, 14:56
Thanks for the reply's.
Unfortunatly nothing mentioned in the OPS manual :hmm:
Dream Land
30th Nov 2007, 15:03
minimum oil temperature for take-off -10° C
Oil Temperature
Minimum prior to exceeding idle..........................-10 C