Britannia High-Lo Flight Regime
Just reading an article about the Bristol Britannia with the Proteus turboprop engine which turned out to have issues with engine icing flameouts. Unlike more modern issues we have seen on certain types leading to the requirement of increased lateral margins, the Britannia crews managed this with what was called a High-Lo flight regime. While one gets the general idea of what was done based on the name of the procedure, I am curious if anyone knows any of the details about this.