I don't know whether or not it has been previously mentioned, but I recall learning
a long time ago that when you set take-off power on a jet engine, all of the engine
gauges will be pointing to either the nine
o'clock or the three o'clock position. I
know that the JT-8D is 9 o'clock, and the CF-6 is 3 o'clock. In the case of the Air
Florida 737 that crashed out of DCA some years back, though EPR was set at 9'clock, all the other gauges were pointing to about 7 o'clock! As the probe starts to ice closed,
it will start to indicate a power setting higher than actual. EBD