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BN727227Ultra
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Joined: Fri Jan 10, 2014 7:15 pm

Maint support for the JT3D v. JT8D

Tue Oct 08, 2019 4:17 pm

I've wanted around in Civil for a while, thought I'd ask a Military question:

MD-80 series being phased out, one reason why is P&W stopping support for the JT8D and the lack of 'Golden Engines'. Fine, understood--they're economic disasters.

But what about the B-52 engines? Older design--just as inefficient, antidiluvian technology. Is it different for the USAF? Does P&W still support the JT3D? Or is the USAF the de facto manufacturer for new engines? You don't hear about B-52 being parked for parts, or going maint, like you heard about the Mad Dogs toward the end.

Thanks!
 
GalaxyFlyer
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Re: Maint support for the JT3D v. JT8D

Tue Oct 08, 2019 9:11 pm

In civil aviation, it’s about economics, is it worth supporting the JT8D and its variants? Not with fleet size. In the government/military world, it’s not so much. P&W or another vendor is issued a sole source contract for support. Done.

I also suspect the number of TF-33s in USAF service is or was large enough to provide a parts source. Thousands were built but no longer in use. We always had a C-5 in “cann status”; used exclusively for parts, every 60 days, it was reassembled replacing the parts cannibalized with parts off the next plane becoming a cann bird. Any major contingency and various bases would have a “cann bird” usually the first plane hard broke became the cann bird. Always fun going to bring it home after fixed.

GF
 
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BN727227Ultra
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Re: Maint support for the JT3D v. JT8D

Tue Oct 08, 2019 9:15 pm

GalaxyFlyer wrote:
In civil aviation, it’s about economics, is it worth supporting the JT8D and its variants? Not with fleet size. In the government/military world, it’s not so much. P&W or another vendor is issued a sole source contract for support. Done.

I also suspect the number of TF-33s in USAF service is or was large enough to provide a parts source. Thousands were built but no longer in use.


Thankee!

GalaxyFlyer wrote:
We always had a C-5 in “cann status”; used exclusively for parts, every 60 days, it was reassembled replacing the parts cannibalized with parts off the next plane becoming a cann bird.


:-)
 
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Spacepope
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Re: Maint support for the JT3D v. JT8D

Wed Oct 09, 2019 12:35 pm

The last TF-33 was supposedly made in 1984. During the beginning of the Afghan expedition and invasion of Iraq, an AWACS crewmember on here claimed they had years and years worth of TF-33s in storage. At that time, the USAF was running C-141s, KC-135s, TC-18s, E-3s and E-8s all using hte engine in addition to the BUFF. Fast forward about 10 years later and the spares were eaten up very quickly. The C-141, TC-18 and KC-125 fleets were all parked reducing demand and freeing up engines for the remaining aircraft. The E-8s were trialed with a JT8D reengine project as well.

Spares should be good now, but you can imagine how many engine hours a B-52 strike in Iraq would eat up when launched from the CONUS, suppored locally by KC-135Es , E-3s and E-8s.
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