User avatar
Ruddman
Topic Author
Posts: 21
Joined: Mon Oct 23, 2017 3:02 pm

TWA / Pan Am 747-100 engines?

Mon Jan 29, 2018 8:10 pm

HI, I was wondering what engines were used in the 741 fleet by these two airlines? Did any use the JT9D-3/A engines? I've read somewhere that many of the 741's with -3 engines were replaced with the -7's. Was this the -7's or -7A's?

Any help greatly appreciated!
 
mmo
Posts: 1604
Joined: Thu Apr 18, 2013 3:04 pm

Re: TWA / Pan Am 747-100 engines?

Tue Jan 30, 2018 6:54 am

IIRC, both PA and TW upgraded the -3A to the -7A due to the increased reliability. I could be wrong, but I can't remember a -7 on any 747. I know NW upgraded their 100s from -3A to -7A also.
If we weren't all crazy we'd all go insane!
 
Apprentice
Posts: 616
Joined: Sat Jan 19, 2013 12:51 pm

Re: TWA / Pan Am 747-100 engines?

Tue Jan 30, 2018 8:29 am

Hi: And with this heavy nacelle, very difficult to close!
Rgds
“An AME, with just a Mechanic Role”, as per one of our pilots
"A NO" is a positive answer., "DON'T KNOW" is not. My Tutor (a wise man)
“CUBANA” 90 years Flying”
 
mmo
Posts: 1604
Joined: Thu Apr 18, 2013 3:04 pm

Re: TWA / Pan Am 747-100 engines?

Tue Jan 30, 2018 9:10 am

Apprentice wrote:
Hi: And with this heavy nacelle, very difficult to close!
Rgds



Forgot about that.. That was done to fix the fan rubbing problem.....IIRC, the first commercial flight was delayed by 4 hours as the result of aircraft change due to fan rubbing on the original aircraft planned.
If we weren't all crazy we'd all go insane!
 
Max Q
Posts: 6668
Joined: Wed May 09, 2001 12:40 pm

Re: TWA / Pan Am 747-100 engines?

Tue Jan 30, 2018 12:31 pm

mmo wrote:
IIRC, both PA and TW upgraded the -3A to the -7A due to the increased reliability. I could be wrong, but I can't remember a -7 on any 747. I know NW upgraded their 100s from -3A to -7A also.



How was this upgrade accomplished and did this particular change increase thrust st all ?
The best contribution to safety is a competent Pilot.
 
mmo
Posts: 1604
Joined: Thu Apr 18, 2013 3:04 pm

Re: TWA / Pan Am 747-100 engines?

Tue Jan 30, 2018 3:16 pm

There was about a 2,000lb increase in thrust from the 3A to 7A. The fan section was redesigned to eliminate the bowing of the fan which was the problem with the initial 3A.
If we weren't all crazy we'd all go insane!
 
User avatar
Ruddman
Topic Author
Posts: 21
Joined: Mon Oct 23, 2017 3:02 pm

Re: TWA / Pan Am 747-100 engines?

Tue Jan 30, 2018 6:17 pm

mmo wrote:
IIRC, both PA and TW upgraded the -3A to the -7A due to the increased reliability. I could be wrong, but I can't remember a -7 on any 747. I know NW upgraded their 100s from -3A to -7A also.



Ok thank you. I’m guessing the -3A wasnt used for any length of time.

And does anyone know what gross weights either used? I’m trying to find some information on them but it’s a little difficult. I guess both airlines having many airframes, they could’ve had several different GW aircraft in the fleet. I think the -100’s ranged from 730,000 to a max of 750,000lb?
 
mmo
Posts: 1604
Joined: Thu Apr 18, 2013 3:04 pm

Re: TWA / Pan Am 747-100 engines?

Wed Jan 31, 2018 6:39 am

IIRC, and it's been a while, the 100s originally had a MTOW of 730 or 735,000. I know NW had their 100s up to 775,000 MTOW. I am pretty sure, the increase was just a paper mod introduced after the original 100s were delivered.
If we weren't all crazy we'd all go insane!
 
User avatar
fr8mech
Posts: 7271
Joined: Mon Sep 26, 2005 9:00 am

Re: TWA / Pan Am 747-100 engines?

Wed Jan 31, 2018 1:43 pm

Back in the -90's, we took our -7A's to -7AH with a "simple" change of the fuel control. Not really sure what the difference between the 2 were.
When seconds count...the authorities are minutes away.
Unless it's expressly prohibited, it's allowed.
You are not entitled to a public safe space.
 
timz
Posts: 6425
Joined: Fri Sep 17, 1999 7:43 am

Re: TWA / Pan Am 747-100 engines

Wed Jan 31, 2018 6:39 pm

Didn't the 747 enter service at 710000 lb?
 
strfyr51
Posts: 3001
Joined: Tue Apr 10, 2012 5:04 pm

Re: TWA / Pan Am 747-100 engines?

Tue Jul 10, 2018 12:40 am

Max Q wrote:
mmo wrote:
IIRC, both PA and TW upgraded the -3A to the -7A due to the increased reliability. I could be wrong, but I can't remember a -7 on any 747. I know NW upgraded their 100s from -3A to -7A also.



How was this upgrade accomplished and did this particular change increase thrust st all ?

Pan Am, TWA, Northwest and United upgraded their JT9D-3A's to the later -7A's, The reliability reportedly Improved greatly.
TransAmerica's B747-200's came with the CF6-50 engine. The British B747-200's were equipped with the Roll RB-211-524's.
At one point or another we got to see all of their airplanes in our Dock 2 Hangar at United's MOC , And at American's "Superbay".

Who is online

Users browsing this forum: No registered users and 15 guests

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos