RTNOBLE
Topic Author
Posts: 5
Joined: Thu Feb 07, 2019 3:29 am

PAE An-124 Spoolup

Thu Feb 07, 2019 3:36 am

I was out at PAE today and noticed an AN124 holding for Takeoff.

A new Fedex 763 was inbound, it came in to land, did a go around and took a nice long lap around Snohomish before coming back,

In the meantime, this AN124 rolled onto the runway, held for a second, then spooled up engines - and then sat there with engines at what sounded like takeoff thrust for what must have been 10 minutes. Flightaware said the Fedex bird would come at 12:22 (it then went around) and flightaware says the AN124 departed at 12:32. It was 10 minutes of screaming AN124 engines. Is this common? Why would this have happened? How much fuel would have been burned off?

I spend a reasonable amount of time at PAE, I don't see the Ruslan very often on the ground but I am sure I've never seen such a protracted start up. What was going on here?
 
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akiss20
Posts: 931
Joined: Tue Sep 04, 2007 9:50 am

Re: PAE An-124 Spoolup

Thu Feb 07, 2019 4:02 am

Maybe taxi out/delays were shorter than expected and they needed to get down to MTOW? If you need to burn fuel fast, TO power is your best bet and probably not too many places you can throttle up near a runway besides the runway itself.
Change will not come if we wait for some other person or some other time. We are the ones we've been waiting for. We are
 
portcolumbus
Posts: 1654
Joined: Tue Nov 14, 2000 7:10 am

Re: PAE An-124 Spoolup

Thu Feb 07, 2019 4:13 am

They're in-and-out of IAH all the time and ALWAYS require around 4-6 minutes on the runway for spool-up.
 
crownvic
Posts: 2445
Joined: Wed Oct 20, 2004 10:16 pm

Re: PAE An-124 Spoolup

Thu Feb 07, 2019 4:15 am

Most AN-124 take offs I have ever seen do this. Maybe not 10 minutes, but a full throttle spool up for several minutes is not uncommon at all.
 
GalaxyFlyer
Posts: 3517
Joined: Fri Jan 01, 2016 4:44 am

Re: PAE An-124 Spoolup

Thu Feb 07, 2019 4:28 am

It was a procedure in the early days of the TF-39 powered C-5 and, I suspect, was done here. The problem was stabilizing temps and internal clearances to achieve full thrust required what old engineer’s called “cooking the engines”. The Russians had difficulty finding advanced metallurgy and the fuel burn on that thing is pretty high.

GF
 
Max Q
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Joined: Wed May 09, 2001 12:40 pm

Re: PAE An-124 Spoolup

Thu Feb 07, 2019 5:03 am

Pretty amazing their engine technology is still at this level


I read an article recently that said they are looking at re-engining the -124 with the GE - CF6-80


Seems like a solid plan
The best contribution to safety is a competent Pilot.


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CATIIIevery5yrs
Posts: 120
Joined: Wed Jun 29, 2016 4:40 am

Re: PAE An-124 Spoolup

Thu Feb 07, 2019 5:25 am

I remember seeing an An-124 perform the same run up on ATL’s 27R with a long line of departures. They then held subsequent departures because the An-124 was reported as barely climbing and real slow across the ground.
 
iamlucky13
Posts: 1052
Joined: Wed Aug 08, 2007 12:35 pm

Re: PAE An-124 Spoolup

Thu Feb 07, 2019 6:33 am

Yes, I have also noticed the An-124's at PAE sit for several minutes spooled up. I suppose the relatively cold weather may have led to a longer warm up today.

I found some further discussion here:
https://www.pprune.org/tech-log/273290- ... e-t-o.html
 
slcguy
Posts: 350
Joined: Wed Jul 09, 2008 12:09 pm

Re: PAE An-124 Spoolup

Thu Feb 07, 2019 1:10 pm

All An-124s I've seen in SLC have done the same thing, power up for awhile before rolling. Usually only for a minute or so, never seen one do it for 10 minutes. I have no idea what the reason for this procedure is.
 
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mach144
Posts: 11
Joined: Sun Aug 19, 2018 10:28 am

Re: PAE An-124 Spoolup

Mon Feb 11, 2019 1:59 pm

At runway line-up point just before take-off roll An-124 warms-up all four engines at 70% nominal (max. cruising) power for two, four or six minutes (depending on take-off weight, outside temperature and aerodrome location).
One minute before start high-lift devices are set in take-off position and one of the engines is set to 80% for a while and then set back to 70%.
3 seconds after brake release initiating take-off roll all four engines are set to calculated take-off power and this regime is maintained up to reaching height of 120 m, when throttles are set to nominal power.
Engines warming-up procedure is used to prevent possible engine-surge at take-off.
 
acjbbj
Posts: 310
Joined: Sat Mar 17, 2018 7:06 pm

Re: PAE An-124 Spoolup

Tue Feb 12, 2019 4:24 am

Max Q wrote:
Pretty amazing their engine technology is still at this level


I read an article recently that said they are looking at re-engining the -124 with the GE - CF6-80


Seems like a solid plan


They should do the Trent 560. Either way, they should do it for both the 124 and the 225
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