One wing three Engines
Joined: Oct 2005
Posts: 570
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From: UK
Yep.
The 747, along with some other aircraft types, were designed to be able to externally ferry non-operative engines for urgent aog cases.
The 747 can take another 747 engine at a specific point under it's wing, as shown, in case one is needed urgently.
As the 747 engines are pretty large, only certain aircraft types can carry them to sick aircraft. So it can be most cost effective to ferry an engine on the wing.
The engine nacelle gets a cover put over it to reduce the drag caused by the spare engine. I believe it doesn't affect costs too much and is much cheaper than chartering a freighter aircraft specifically for the task.
The 747, along with some other aircraft types, were designed to be able to externally ferry non-operative engines for urgent aog cases.
The 747 can take another 747 engine at a specific point under it's wing, as shown, in case one is needed urgently.
As the 747 engines are pretty large, only certain aircraft types can carry them to sick aircraft. So it can be most cost effective to ferry an engine on the wing.
The engine nacelle gets a cover put over it to reduce the drag caused by the spare engine. I believe it doesn't affect costs too much and is much cheaper than chartering a freighter aircraft specifically for the task.
The Cooler King
Joined: Feb 2004
Posts: 1,717
Likes: 30
From: Europe
Yes it's real......The engine is being transported for another plane. It's not used during the flight......happens all the time!
The dome inside this engine is just to streamline it in flight.
The dome inside this engine is just to streamline it in flight.
Joined: Apr 2005
Posts: 569
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From: Stockholm Sweden
When I was working for Gulf Air in the early 80,s we regularly ferried engines from BAH to LHR. But it was very inefficient.
First you had to put 7 tonnes of extra fuel in the opposite wing tank to balance the aircraft, Then you were limited to (I think) 250kts which meant you had to stop for fuel in Larnaca. We tried not to do it on pax flights, or limited the load to the minimum.
I once took a picture of a GF Tristar with a third pod parked on the ramp next to a BA Tristar with a third pod, but sorry I can't find it at the moment.
The Tristar third pod kit was much more difficult to fit than the B747-200. It could take 3 hours to get it right. The B747 went off or on in an hour, and the B747 was far easier to fit and remove, and didn't have the flight limitations.
First you had to put 7 tonnes of extra fuel in the opposite wing tank to balance the aircraft, Then you were limited to (I think) 250kts which meant you had to stop for fuel in Larnaca. We tried not to do it on pax flights, or limited the load to the minimum.
I once took a picture of a GF Tristar with a third pod parked on the ramp next to a BA Tristar with a third pod, but sorry I can't find it at the moment.
The Tristar third pod kit was much more difficult to fit than the B747-200. It could take 3 hours to get it right. The B747 went off or on in an hour, and the B747 was far easier to fit and remove, and didn't have the flight limitations.
Joined: Jan 2003
Posts: 323
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From: Manchester
Ah the legendary fith pod!!!
This was one of those idears that looks good but in fact has so many downsides to it that most airlines choose to either three engine ferry the aircraft back or to hire a freighter. The cost of the equipment and the disruption to the operation being the main ones.
I was on the 747's for four years a while ago and I never saw one done. I did hang a fourth pod on a Tristar once and I will confirm what Swedish Steve says by saying it was a long back breaking job that I would not choose to repeat!!
Hears a question ,can the 747-400 carry one?
Rgds Dr I
This was one of those idears that looks good but in fact has so many downsides to it that most airlines choose to either three engine ferry the aircraft back or to hire a freighter. The cost of the equipment and the disruption to the operation being the main ones.
I was on the 747's for four years a while ago and I never saw one done. I did hang a fourth pod on a Tristar once and I will confirm what Swedish Steve says by saying it was a long back breaking job that I would not choose to repeat!!
Hears a question ,can the 747-400 carry one?
Rgds Dr I
Joined: Jul 2000
Posts: 1,424
Likes: 0
From: Smogsville
Joined: Jan 2003
Posts: 323
Likes: 0
From: Manchester
Found it!!!
http://forum.keypublishing.co.uk/sho...t=engine+ferry
The story is that during an engine change they found that the pylon was cracked. So they flew it to a repair shop like that!. I would love to have been a fly on the wall when they broke the news to the crew!!
"Aircrafts fueled Captain and the daily has been done. Oh there's just one more thing..........."
Rgds Dr.I
http://forum.keypublishing.co.uk/sho...t=engine+ferry
The story is that during an engine change they found that the pylon was cracked. So they flew it to a repair shop like that!. I would love to have been a fly on the wall when they broke the news to the crew!!
"Aircrafts fueled Captain and the daily has been done. Oh there's just one more thing..........."
Rgds Dr.I
Está servira para distraerle.
Joined: Jan 2002
Posts: 6
Likes: 1
From: In a perambulator.
Some little time ago when I wrote Flight Planning for the ATPL licence, the 747 ferry graphs were in the schedules provided and we got flight planning questions on it.
Hope this helps.
Hope this helps.
Joined: Aug 1999
Posts: 978
Likes: 0
From: EGCC
BOAC VC-10
Also recall seeing a BOAC Super VC-10 at Manchester with a spare engine in a very streamlined pod under the left wing.
Out of interest why does it seem to be the left wing that is always used?
Scottie Dog
Out of interest why does it seem to be the left wing that is always used?
Scottie Dog
Joined: Jan 2003
Posts: 323
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From: Manchester
Don't know for certain but I'll hazzard a guess that they want to keep the area around the freight bay doors clear. That will enable the loading and the 5th podding can happen at the same time. As I said its only a guess it could be rubbish
RGds Dr I
RGds Dr I
Joined: May 1999
Posts: 605
Likes: 10
From: UK
interestedparty, the difference of course is that the RB211 VC-10 (G-AXLR) was a trials aircraft used for development of the engine, rather than in use an operational ferry task.
It caught the attention, though.
It caught the attention, though.
Joined: Dec 2003
Posts: 147
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From: South of Watford
In the early days of the 742 we 5th podded from LHR to MIA, with very little information, but it worked ! Subsequenly an ASI overlay was provided with the speed limits for future flights (290kt / M 0.85 I believe) Above those speeds a light harmonic vibration was noticed. For added interest it was the first flight in a 742 for all of us. (G-BDXB 9/8/77)
The original plan was to route via JFK, but the Captain wisely suggested non-stop which was easily achieved. Sorry about the 20+ staff pax who were offloaded !
I think a photo even made the front page of the Miami Herald - "5 little engines" was the caption if my long term memory is accurate.
p.s., The 3 engined VC10 and 5 engined Vulcan (Olympus for Concorde) were regularly seen in the Filton Area many moons ago.
The original plan was to route via JFK, but the Captain wisely suggested non-stop which was easily achieved. Sorry about the 20+ staff pax who were offloaded !
I think a photo even made the front page of the Miami Herald - "5 little engines" was the caption if my long term memory is accurate.
p.s., The 3 engined VC10 and 5 engined Vulcan (Olympus for Concorde) were regularly seen in the Filton Area many moons ago.
Joined: May 1999
Posts: 605
Likes: 10
From: UK
Whilst I'm finding engine testbed pics:
5 engined Vulcan (Olympus):
5 engined Vulcan (RB199):
Same airframe (Vulcan B1 - XA903).
There was also a Pegasus testbed Vulcan, I believe. Anyone have a picture of that?
5 engined Vulcan (Olympus):
5 engined Vulcan (RB199):
Same airframe (Vulcan B1 - XA903).
There was also a Pegasus testbed Vulcan, I believe. Anyone have a picture of that?