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B737NG_Pilot
28th Sep 2023, 12:35
There is no mention of engine warms up for the P&W1100G, unlike the Leap-1A.

Any Reason Why?

Amadis of Gaul
10th Oct 2023, 23:33
There is no mention of engine warms up for the P&W1100G, unlike the Leap-1A.

Any Reason Why?

Be specific, please, no mention of it where? Your manuals? I ask because our manuals require a 5-minute warm-up after a shutdown of more than 2 hours, and a 3-min warm-up less than 2 hours after last shutdown. This is both for 1100G and for IAE.

AerocatS2A
11th Oct 2023, 17:41
5 minutes warm up is required after 2 hours of not running to prevent thermal shock. There is no requirement to warm up the engines after a short turn-around, however there is a requirement to wait 2 minutes (not 3) after the last engine start to give the centre tank pumps time to complete their self test. MSNs that donít have centre tank pumps donít have this requirement so there is no minimum wait time after start in this case. In our fleet this includes late model CEOs and all NEOs.

Refer to FCOM PRO-NOR-SOP-AFTER START.

You can identify aircraft without centre tank pumps by the overhead panel. If the centre tank transfer switches are labelled ďPUMPĒ then they are mechanical pumps, if they are labelled L/R XFR then they are jet pumps and donít have the self test requirement.

Lawrence2725
26th Nov 2023, 13:42
There is no mention of engine warms up for the P&W1100G, unlike the Leap-1A.

Any Reason Why?

It must be stated somewhere. The warm-up time of the GTF is/was a key gripe of the operators of this engine.

AerocatS2A
26th Nov 2023, 17:21
It must be stated somewhere. The warm-up time of the GTF is/was a key gripe of the operators of this engine.
Really? Are you thinking of the pre-start cooling perhaps?

hans brinker
27th Nov 2023, 06:24
5 minutes warm up is required after 2 hours of not running to prevent thermal shock. There is no requirement to warm up the engines after a short turn-around, however there is a requirement to wait 2 minutes (not 3) after the last engine start to give the centre tank pumps time to complete their self test. MSNs that donít have centre tank pumps donít have this requirement so there is no minimum wait time after start in this case. In our fleet this includes late model CEOs and all NEOs.

Refer to FCOM PRO-NOR-SOP-AFTER START.

You can identify aircraft without centre tank pumps by the overhead panel. If the centre tank transfer switches are labelled ďPUMPĒ then they are mechanical pumps, if they are labelled L/R XFR then they are jet pumps and donít have the self test requirement.

My company is in the proces of getting the FCOM. Currently using AOM+COM. Haven't read the whole FCOM yet, as it just came out last week and won't be controlling till March earliest. Our current and controlling manual has in AOM2-Normal Procedures-Taxi Expanded:
"When Engine 2 reaches idle, continue flow:
Consider starting the CHRONO to monitor engine warm-up time:
Shutdown for ≥ 2 hrs 5 min before high power.
Shutdown for < 2 hrs 3 min before takeoff."
Now, this might be because we try to fly the NEOs and CEOs the same, but it is in my book, and has nothing to do with the 2 minute center tank thing for the older CEOs.

AerocatS2A
27th Nov 2023, 08:47
My company is in the proces of getting the FCOM. Currently using AOM+COM. Haven't read the whole FCOM yet, as it just came out last week and won't be controlling till March earliest. Our current and controlling manual has in AOM2-Normal Procedures-Taxi Expanded:
"When Engine 2 reaches idle, continue flow:
Consider starting the CHRONO to monitor engine warm-up time:
Shutdown for ≥ 2 hrs 5 min before high power.
Shutdown for < 2 hrs 3 min before takeoff."
Now, this might be because we try to fly the NEOs and CEOs the same, but it is in my book, and has nothing to do with the 2 minute center tank thing for the older CEOs.

What engine type are you using on the CEOs? Ours are IAE V2500.

My FCOM says the following, the first paragraph is for aircraft with centre tank transfer pumps (older CEOs) and the second paragraph applies to aircraft with jet pumps (newer CEOs and all NEOs):


ENG MODE
ENG MODE selector -- NORM
For additional information on the automatic starting sequence, Refer to DSC-70-80-40 Sequence of the Automatic Start.

After a shutdown period greater than 2 h, to avoid thermal shock, the pilot should operate the engine at idle or near idle for at least 5 min before advancing the thrust lever to high power. Taxi time at idle may be included in the warm-up period. The last engine started must run for at least 2 min before takeoff initiation, to ensure that takeoff is not initiated before the center tank pumps test is finished, since takeoff on center tank is prohibited.

ENG MODE
ENG MODE selector -- NORM
For additional information on the automatic starting sequence, Refer to DSC-70-80-40 Sequence of the Automatic Start.

After a shutdown period greater than 2 h, to avoid thermal shock, the pilot should operate the engine at idle or near idle for at least 5 min before advancing the thrust lever to high power. Taxi time at idle may be included in the warm-up period.
So from that it appears there is no engine warm up required for a short turn around, only a 2 minute wait time for the centre tank pumps to complete their test if fitted. It's possible that this is an error with the FCOM of course.

hans brinker
28th Nov 2023, 05:19
What engine type are you using on the CEOs? Ours are IAE V2500.

My FCOM says the following, the first paragraph is for aircraft with centre tank transfer pumps (older CEOs) and the second paragraph applies to aircraft with jet pumps (newer CEOs and all NEOs):


So from that it appears there is no engine warm up required for a short turn around, only a 2 minute wait time for the centre tank pumps to complete their test if fitted. It's possible that this is an error with the FCOM of course.


Or it could be they didn't update my manual.... 🤷‍♂️ I just follow the book they gave me.
We have IAE CEO & 1100 NEO.