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Re Engine 707 In Service

Sonic67 From United States of America, joined Jan 2005, 290 posts, RR: 0
Posted (8 years 1 month 2 weeks 5 days 17 hours ago) and read 2024 times:

I was wondering if any commercial or privately owned 707 carriers other than the military have re engine their AC with modern high bypass turbofan such as the Pratt & Whitney CFM56 or the TF33 (JT3D) conversion kits. The newer engines can increase thrust by 35 percent and fuel consumption by 15-22 percent. I was wondering can the newer engines make it economical to operate the 707?

Greg nosy

8 replies: All unread, jump to last

707fan From Norway, joined Jun 2001, 36 posts, RR: 2
Reply 1, posted (8 years 1 month 2 weeks 5 days 15 hours ago) and read 1985 times:

In 1978 Boeing contemplated offering a 707 version to be powered by CFM56-1B turbofan giving 22000ib trust. This move followed studies carried out for the USAF concerning the re-engining of the KC-135s and although generally similar to the 320B, the 700 as intended for long range work. One civil airframe was equipped with the new engines and was first flown 27 November 1979. Trials were completed during the following July but lack of airline interest or modernised 320B/Cs sealed the fate of the project.
Although there was an increase in weight, this penalty was more than offset by lower fuel consumption, reduced noise levels and less smoke emission. The only civil airframe was reverted to normal and sold to the Government of Morocco as CN-ANR in 1982.

Sonic67 From United States of America, joined Jan 2005, 290 posts, RR: 0
Reply 2, posted (8 years 1 month 2 weeks 5 days 15 hours ago) and read 1966 times:

Now that I think of it I may have seen that AC at LAX about 10 years ago.

Thanks for the info.
cool

Duke From Canada, joined Sep 1999, 1135 posts, RR: 2
Reply 3, posted (8 years 1 month 2 weeks 5 days 12 hours ago) and read 1907 times:

I know there is one test aircraft re-engined with JT8Ds, but don't know of any conversions having been made so far.

UAcsOKC From United States of America, joined Dec 2004, 107 posts, RR: 1
Reply 4, posted (8 years 1 month 2 weeks 5 days 11 hours ago) and read 1885 times:

Quoting Duke (Reply 3):
I know there is one test aircraft re-engined with JT8Ds, but don't know of any conversions having been made so far.

The Dash Eighty had at least one JT8D on it at some point. In fact it flew with four different engines many times in it's career. Don't know of any others.

I love the rumble of a 727 takeoff in the morning!

KC135TopBoom From United States of America, joined Jan 2005, 11708 posts, RR: 52
Reply 5, posted (8 years 1 month 2 weeks 5 days 11 hours ago) and read 1869 times:

There were military B-707-700s (new builds). The USN E-6A/B Mercury is a B-707-700, as are the E-3Fs sold to the RAF and France. Additionally the E/KE-3Gs sold to the RSAF are all B-707-700 airframes.

Ryan h From Australia, joined Aug 2001, 1451 posts, RR: 1
Reply 6, posted (8 years 1 month 2 weeks 5 days 10 hours ago) and read 1857 times:

There is one 707 with JT8Ds as far as I know, N88ZL owned by the Lowa Group.

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SATL382G From , joined Dec 1969, posts, RR:
Reply 7, posted (8 years 1 month 2 weeks 5 days 10 hours ago) and read 1824 times:

Quoting Sonic67 (Thread starter):
I was wondering if any commercial or privately owned 707 carriers other than the military have re engine their AC with modern high bypass turbofan such as the Pratt & Whitney CFM56 or the TF33 (JT3D) conversion kits

The CFM56 is a SNECMA engine not Pratt & Whitney. Many 707s & 720s got the JT3D conversions in the 60s, AA did a bunch of these as I recall.

regards

Spacepope From Vatican City, joined Dec 1999, 2736 posts, RR: 1
Reply 8, posted (8 years 1 month 2 weeks 5 days 8 hours ago) and read 1746 times:

Quoting Ryan h (Reply 6):
There is one 707 with JT8Ds as far as I know, N88ZL owned by the Lowa Group.

Those are JT3D's, just in an improved nacelle.

N707HE is the only one fitted with JT8D's so far

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