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One of the optional services in Rolls-Royce TotalCare is "Engine Transportation"
This service includes routine transportation of engines between the customer’s main base (or designated station) and the engine shop, and/or remote site transportation.
Jet engines can be very large heavy and expensive items. How are they transported? Are they flown or do they use road transport? Are there dedicated vehicles?
They have the usual transport options: shove into cargo area, on a flatbed truck, shipping container,...
They can also be attached below the wing of a large aircraft and flown with if there is no room in the cargo area.
(stolen from this question)
Notice the extra engine on the near wing.
The Conroy CL-44 "Skymonster" was built for the purpose of transporting three Rolls-Royce RB-211 engines. It was a derivative of the Canadair CL-44 and was meant to transport the engines for the Lockheed Tristar. Jack Conroy had before modified old C-97s to Super Guppy transporters, and those initially transported Saturn rocket stages for NASA.
The picture below was shamelessly copied from the Wikipedia article. Note the bulges near the tail: They cover the hinges for the sideways opening fuselage.
Today, Boeing 747 freighters can swallow most engines, so in the age of widebody transporters there is no more need for special aircraft for engine transport. For the ones that don't fit inside the 747, there is always the Antonov An-124.
Having lived for nearly 15 years around the Boeing factories in Seattle, it was a common sight to see a flat-bed truck with a tarp-covered engine driving up and down the freeway.
Just like other big industrial machinery, they build a mounting for it, put it on a truck, and drive it down I-5.
It's apparently pretty hard to get outer engine dimensions, but based on fan size and adding a bit, all but the largest engines will go on a standard truck. Oversize permits are readily available.
Rolls-Royce makes engines in Derby (amongst other places) but not at the airport. ( East Midlands airport has one runway, 8200 feet, which is a bit tight for a 747.) Therefore, engines must leave the factory by truck at least once.
I expect that the decision to send the dud engine for service by truck, boat, on the wing or in the hold will be purely economics.
Jet engine transportation is a highly specialized task, the primary method is ground transportation via truck and trailer.
It is important that the transport company uses fully air-ride trailers and advanced load securement techniques to ensure zero stress on sensitive engine components.
Peter Kämpf - While you are correct that some engines can fit inside of an aircraft for transport, the cost for this service is enormous when you compare it to a truck and trailer. Also larger engines such as the Trent 1000 (Fits on a 787 Dreamliner) will not fit inside of an air cargo carrier.
