N1 Vibes
OK this is from the RB211-524G MM 77-11-00
Signals from the LP compressor exhaust pressure (fan outlet)(P1.3) and gas generator exhaust pressure (P5) are supplied from rakes to the multiple connector where they are integrated and the resultant pressure (PINT) then moves to the FAFC.
LP compressor entrance air goes to the P2/T2 probe and flows to the FAFC.
The FAFC supplies EPR to the flightdeck.
The multiple connector is a tube with two different sized baffles in it, one baffle for P5 and one baffle for P1.3.
Combustor pressure is not involved in EPR.