Originally Posted by
beardy
Interesting to hear of your experiences. I suppose the rotational friction includes the ancillaries (pumps, generators etc..) and of course the compressor.
I wonder what the procedure was when ferrying the 5th engine on the 747? But I suppose they may have had problems lubricating the shafts. Similarly for dead engine ferry flights.
Don't know about 747 etc but going back to the BAe 146/RJ engines, both spools were gagged for ferry flights to combat the lubrication issues you mention.