Engine Changes

[Saintsman]

As a rough guide, how long does it take to change an engine on a large wide bodied aircraft and how many people do you need?

Also, if an aircraft was undergoing something like a C8, a D check or a long modification. Are there any requirements (apart from possibly inhibiting) for the engines? ie do they need to be rotated periodically so that all the weigh is not on one part of the bearings etc.

Thanks,

Saintsman