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Classic 747 Engines

Fri Feb 06, 2004 1:15 am

Hi there,

Today while checking some pictures from LV-MLO at EZE, I found something that I didn't saw before. Browsing though the database, I found that the same aircraft had different kind of engines through its life. Is it common for an airline change the engines from their planes??? I mean, chage the type of the engines (i.e. from CF6 to JT9D and so on)

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See ya,
Posts: 1048
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RE: Classic 747 Engines

Fri Feb 06, 2004 2:26 am

B747Skipper seems to be gone for a long time!  Sad


EDIT: Forgot to mention the only thing I know about the subject, the older engines are JT-9Ds.

[Edited 2004-02-05 18:28:35]
Posts: 318
Joined: Mon Aug 25, 2003 10:57 am

RE: Classic 747 Engines

Fri Feb 06, 2004 2:43 am

Actually, the top photo which looks like a CF6 is a rare JT9D model called the -70A. Flying Tigers was one of the users of that powerplant and they leased that airplane several times from Aerolineas which is why you see -70As and -7Qs on the same airplane over time. But the actual engine manufacturer did not change. The -70A was, at the time of its release, the only 53000lb option from Pratt & Whitney for the 747. The extended cowl was built by ROHR (well known hush dynamic engineering firm) and was marketed as a "common nacelle" intended to fit on the DC-10-40 as well. The powerplant also had a slightly different accessory section location than the normal JT9D. Because of the increased drag and lower ground clearance, it was not popular and the engine was brought back to the standard design and dubbed the -7Q.
In the Alaska bush I'd rather have a two hour bladder and three hours of gas than vice versa.
Posts: 59
Joined: Tue Sep 18, 2001 1:20 am

RE: Classic 747 Engines

Fri Feb 06, 2004 3:32 am

hehe... someday I'll be able to take month-long holidays like the skipper.... might require me to move to Europe, but someday!

(edit: of course skipper is living in South America now... maybe I'll move down there)


[Edited 2004-02-05 19:33:23]
Posts: 1100
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RE: Classic 747 Engines

Fri Feb 06, 2004 4:15 am

To answer your question in the simplist terms: NO
It involves pylon change, support systems and wiring and way too many things to talk about here.
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
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RE: Classic 747 Engines

Fri Feb 06, 2004 6:15 am

I thought the GE version has 5,000lbs more thrust than the PW version? Either way the Pw version sounds nicer!
Go big or go home
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RE: Classic 747 Engines

Fri Feb 06, 2004 7:20 am

Okay, so this 747 was always P&W, right? And a few 747s changed from P&W to GE, back in the 90s. Did any ever change from GE to P&W?
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RE: Classic 747 Engines

Fri Feb 13, 2004 2:05 am

re. the original question - not common for an airline to change engine types itself, but examples of re-engining fleets include RR Tay on 727s, CFM-56 on DC-8s and C-135s, and JT-3-200?? on 727 positions 1 and 2.

The Tu-144 used a few years ago for the NASA tests used engines from a Blinder bomber IIRC but thats off the point.

Regards - Musang
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RE: Classic 747 Engines

Fri Feb 13, 2004 6:45 am

Didn't Atlas Air get a few 742's converted from P&W to GE?

Statistically, people who have had the most birthdays tend to live the longest.

RE: Classic 747 Engines

Thu Feb 19, 2004 1:11 am

Hola Amigos -
Do you mind if I rest a little bit on the beach...?
LV-MLO was often leased to FTL as their passenger aircraft for military "MAC charters" in the 1980s, and got fitted at one time with JT9D-70A engines, as FTL had inherited with their merge (SWA) of a few 747-245F which had these engines. That was before my start here in Argentina...
The JT9D-70A reversers have bad reputation, some operators went as far as asking crews not to operate reversers unless absolutely necessary.
Correct, Atlas converted some of their P&W 747 with GE CF6 engines. To do so they acquired some old ex-ANA 747-181 parked in the desert, took their engine mounts and struts to convert their P&W powered 747 to CF6 engines. This is the only airline that ever did such major change.
Aerolineas operated a CF6 powered 747 airplane at one time, it was on lease, in the early 1990s, from Varig... Nice engine, like it much (personal opinion).
Happy contrails  Smile
(s) Skipper
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RE: Classic 747 Engines

Thu Feb 19, 2004 4:40 am

Everyone seems to be forgeting the RR RB211. BA, Qantas and Cathay to mention a few used this make and model on the later classics.


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