Our 757 has RB211-535E4 engines with EEC control. Worst case scenario, a departure with Anti Ice required, but forgotten. Is it possible that the EPR probes could ice up (similar situation to Palm 90) and display erroneous values?
I am used to GE engines, where this was not a factor, as thrust is referenced primarily to N1. I know we used to compute a value back on the Pratt's on the 727 to cater for this scenario.
I have seen a chart for this engine from a previous operator that compares Takeoff N1 to EPR at various temperatures. This is not included in the present QRH. Not sure how it was developed, but to me, indicates this could happen.
Does the EEC prevent this from happening using other N values as a reference?
Many thanks in advance, as this was asked recently, and I don't have an answer.
