B727LVR
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Usaf E-8 Re-engine Program

Fri May 20, 2011 4:10 pm

A question was asked in the OMEGA accident thread abuot 707's being re-engined with JT8D-219 engines. Doing some research I found that the USAF is going to put the -219 engine on their E-8's instead of the CFM engine like the KC-135 and so on. Any guesses as to why?

http://www.pw.utc.com/media_center/assets/me_jt8d-219_product_card.pdf

http://www.pw.utc.com/media_center/p.../2001/11_nov/11-7-2001_6112724.asp

http://www.youtube.com/watch?v=16Ts8Ebkd_I&feature=related

http://www.youtube.com/watch?v=8-IHRw-UbV0&feature=related
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zanl188
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RE: Usaf E-8 Re-engine Program

Fri May 20, 2011 8:40 pm

IIRC the CFM had an adverse impact on the operation of the mission radar that the JT8D did not.
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litz
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RE: Usaf E-8 Re-engine Program

Fri May 20, 2011 9:23 pm

To clarify - the JT8D is a much narrower profile, and therefore doesn't block part of the radar operating area ...

That big fat fan (by comparison) on the CFM simply gets in the way.
 
LAXintl
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RE: Usaf E-8 Re-engine Program

Fri May 20, 2011 10:06 pm

Good previous discussion here:
Re-engined E-8 To Begin Flight Test 17 Dec. 08 (by KC135TopBoom Dec 6 2008 in Military Aviation & Space Flight)

Also article discussing the choice of CFM versus JT8D.
http://www.defenseindustrydaily.com/Re-engining-the-E-8-JSTARS-04891/

http://media.defenseindustrydaily.com/images/AIR_E-8C_Re-engined_First_Flight_2008-12-20_lg.jpg
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dlednicer
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RE: Usaf E-8 Re-engine Program

Sun May 22, 2011 11:19 pm

As this picture shows, the smaller JT8D-200 nacelles also work well with the MS-177 Senior Year sensor:
 
JoeCanuck
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RE: Usaf E-8 Re-engine Program

Tue May 24, 2011 7:19 am

It sounds like a shockingly sensible idea. A 19% savings in fuel burn, probably millions more per plane saved in retrofitting each plane, a huge performance increase, works better with their sensor arrays, way cheaper per engine...and only 6% less fuel efficient than the -56.

Makes so much sense I'm surprised they are actually doing it.
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litz
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RE: Usaf E-8 Re-engine Program

Thu May 26, 2011 9:28 pm

And don't forget, as the DC9's and MD80s get retired ... a plentiful supply of engines and engine parts.

- litz
 
Spacepope
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RE: Usaf E-8 Re-engine Program

Thu May 26, 2011 10:14 pm

Quoting litz (Reply 6):
And don't forget, as the DC9's and MD80s get retired ... a plentiful supply of engines and engine parts.

- litz

How would the DC-9 retirement help?

Pratt has just recently restarted production of the JT8D-219 for this project. The E-8 will get new production units.
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B727LVR
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RE: Usaf E-8 Re-engine Program

Sat May 28, 2011 6:23 am

Quoting Spacepope (Reply 7):
Pratt has just recently restarted production of the JT8D-219 for this project. The E-8 will get new production units.

This is huge for P&W... enough engines for 17 aircraft, plus spares... This is a good sum of money. Looks like the 707 is going the way of the the B-52 for the military...
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AWACSooner
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RE: Usaf E-8 Re-engine Program

Tue May 31, 2011 5:08 am

Too bad they're not even thinking about re-engining my aircraft.
 
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kc135topboom
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RE: Usaf E-8 Re-engine Program

Tue May 31, 2011 12:04 pm

Quoting AWACSooner (Reply 9):
Too bad they're not even thinking about re-engining my aircraft.

It would make sense to reengine the USAF E-3B/Cs with the F-108 (CFM-56) engines of the E-6Bs, KC-135Rs, and some RC-135 models..
 
Spacepope
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RE: Usaf E-8 Re-engine Program

Tue May 31, 2011 1:14 pm

Quoting KC135TopBoom (Reply 10):
It would make sense to reengine the USAF E-3B/Cs with the F-108 (CFM-56) engines of the E-6Bs, KC-135Rs, and some RC-135 models..

Nah, give them the JT8D, they can have thrust reversers then!

AWACSSooner: wasn't the mantra a few years ago "We've got all the JT3s we ever need" in storage?
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AWACSooner
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RE: Usaf E-8 Re-engine Program

Tue May 31, 2011 6:10 pm

Quoting Spacepope (Reply 11):
AWACSSooner: wasn't the mantra a few years ago "We've got all the JT3s we ever need" in storage?

That was BEFORE most of them were de-rated on their thrust and sent to re-engine all the Buffs. Can't go into too much detail, but it's now a point of concern for my airframe.
 
JoeCanuck
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RE: Usaf E-8 Re-engine Program

Wed Jun 01, 2011 7:23 pm

Quoting AWACSooner (Reply 12):

Maybe take the big dish off of the top the slide a frame or two into the E-8 re-engine line...who'd know...?
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AWACSooner
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RE: Usaf E-8 Re-engine Program

Wed Jun 01, 2011 7:54 pm

The lack of a trough radar underneath would give us away...
 
JoeCanuck
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RE: Usaf E-8 Re-engine Program

Thu Jun 02, 2011 12:36 am

Quoting AWACSooner (Reply 14):
The lack of a trough radar underneath would give us away...

...eventually...maybe. Tell 'em it's in the shop...or it's got the new slim contoured double extra dopplerish super wide scan, flush mounted unit...very hush, hush.
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