UAL727NE
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DL 757 Engines Question

Fri Apr 09, 2010 11:29 pm

So I just remembered on a night back in 03/04 I was on top of the PHX terminal 3 parking garage watching planes one night. A DL 757 came in and when it shut down, the pilot spooled the engines up a bit then cut fuel flow. When the engines spooled down they started clattering, Now at the time I was a Crew Chief on F-16's and the pilots did the same thing, I have never heard this on an Airliner before. I've flown a few 757's in my time and have never been on, or heard one do this, also never heard of an engine on an airliner clatter from the N1 blades like F-16's and other small aircraft do.
So what engines were they? Pratt's? But I flown on a UA Pratt 757 and never heard this? Any insight? Thanks
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Dalmd88
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RE: DL 757 Engines Question

Sat Apr 10, 2010 1:30 am

The midspans clatter all the time when the engine windmills. Yes, they are Pratt and Whitney.
 
UAL727NE
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RE: DL 757 Engines Question

Sat Apr 10, 2010 2:10 am

Thanks, I must of just never noticed it before. DO you know why they ran the engine up before fuel cutoff?
Gotta love 3 holers!!! MD11,DC10,L-1011,B727 for life!!!!
 
ex52tech
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RE: DL 757 Engines Question

Sat Apr 10, 2010 6:21 am

Quoting UAL727NE (Reply 2):
DO you know why they ran the engine up before fuel cutoff?

Not sure why they ran them up slightly, I was run-up and taxi qualified on them at the airline I worked at. Never remembering hearing, or reading anything on a spool up prior to shutdown.
Some of the older jet engines required a oil scavenge before shutdown, and that involved essentially going to an rpm comparable to flight idle for 20 to 30 seconds then chopping the fuel. This was to ensure that the bearing compartments were scavenged of excess oil that had accumulated while at idle, to help prevent oil from puddling in the inlet or tail pipe. These were JT3s, and JT3Ds, on military aircraft, so it could have been a military requirement also.

If you think the fan blades clank on a 2037, then you should have heard the older JT9s. In a strong wind they will set up such a rattling racket, that you had to yell loudly to be heard over the noise when near them.
"Saddest thing I ever witnessed....an airplane being scrapped"
 
UAL727NE
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RE: DL 757 Engines Question

Sat Apr 10, 2010 6:31 am

Thanks for your reply, yea the 16's I worked had the PRatt's and they had to run up for the oil scavange. Must of been really loud! When I worked for an FBO, the Citation that was based there would clank, and on a really windy day it sounded like the engine was going to fry from the really fast I don't know what you would call the noise, screechy? lol Maybe the pilot was an F-16 pilot or something lol.
Gotta love 3 holers!!! MD11,DC10,L-1011,B727 for life!!!!
 
LASoctoberB6
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RE: DL 757 Engines Question

Sat Apr 10, 2010 9:23 am

Quoting ex52tech (Reply 3):
clank on a 2037,

I have no idea why I thought Delta used PW2024s. Actually, I can't remember what I thought they used...
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Tristarsteve
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RE: DL 757 Engines Question

Sat Apr 10, 2010 9:54 am

Quoting UAL727NE (Thread starter):
the pilot spooled the engines up a bit then cut fuel flow

Don't know the PW2000, but on our B757 we have RB211. When you turn the engines off they run up a little before shutting down. Must be a function of the FFR, its not something the crews do.
 
Western727
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RE: DL 757 Engines Question

Sat Apr 10, 2010 4:50 pm

Quoting LASoctoberB6 (Reply 5):
Delta used PW2024s

PW2037s for sure, and possibly PW2040s (perhaps the ex-TWA 752s?). P&W offered 3 basic powerplants for the 757: the 2037, 2040 and 2043.
Jack @ AUS
 
LASoctoberB6
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RE: DL 757 Engines Question

Sat Apr 10, 2010 6:52 pm

Quoting Western727 (Reply 7):
PW2037s for sure, and possibly PW2040s (perhaps the ex-TWA 752s?). P&W offered 3 basic powerplants for the 757: the 2037, 2040 and 2043.

Ah. That's what they were. Does UA use the PW2040s on their 757s? Or was it NW who used the PW2043s? I can't remember!

Thanks for the DL bit, though.  
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FlyASAGuy2005
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RE: DL 757 Engines Question

Sun Apr 11, 2010 3:10 am

If i'm no mistaken, 2043s hang off the NW 75s.
What gets measured gets done.
 
Transpac787
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RE: DL 757 Engines Question

Sun Apr 11, 2010 4:50 am

Quoting LASoctoberB6 (Reply 8):
Does UA use the PW2040s on their 757s?

At one point, UA had PW2040's on their ETOPS birds. They've long since been derated to 37,000# thrust though and subsequently the entire fleet now has PW2037.

Quoting FlyASAGuy2005 (Reply 9):
If i'm no mistaken, 2043s hang off the NW 75s.

All 757-200's at DL, including the 75A and 75E, have the PW2037. The various subfleets have different thrust-ratings, however. The 75A and 75E have the full 37,000# thrust-rate. The domestic 755 and 756 are in the ~34,000# thrust range.

The ex-NW 757-300's have PW2040's. No 757 in the combined NW/DL fleet as PW2043's.
 
movingtin
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RE: DL 757 Engines Question

Sun Apr 11, 2010 4:55 pm

The 2037 and 2040 are the exact same engine, A data plug change on the EEC is the only difference in them. The 2043 is the 757-300 engine.
 
ex52tech
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RE: DL 757 Engines Question

Sun Apr 11, 2010 6:18 pm

Quoting FlyASAGuy2005 (Reply 9):
If i'm no mistaken, 2043s hang off the NW 75s.

All of NW's 752s had 2037s on them even the 94 package engines were 2037s. The 94 package had different fan blades and more turbine case cooling than the original 2037s, but the fan blades even though they were more robust in the 94 package, they were supposedly less efficient than the original blades. There were some other subtle changes in that package but I don't recall what they were.
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