(3)  
The EPR signal is biased by the input to the EEC data entry plug to give the correct EPR/thrust relationship and the output (actual EPR) is transmitted from the EEC to the flight management computer (FMC) and the EFIS/EICAS interface units (EIU's), which then displays actual EPR on the main EICAS display.

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SEE B
SEE  A 
FLANGE S  FLANGE P  FLANGE P  FLANGE S 
FLANGE T  FLANGE T 

EPR (PT4.95)MANIFOLD
EPR (PT4.95) PROBE
SEE D
TURBINE EXHAUSTTURBINE CASEEXHAUST
CASE
EPR (PT4.95) PROBE
SEE C
EPR (PT4.95) MANIFOLD
A FWD  B FWD
Engine Pressure Ratio Indicating System Component Location Figure 1 (Sheet 1)
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EGT (TT4.95) THERMOCOUPLE PROBE

EPR (PT4.95) PROBE
SEE

EPR (PT4.95) MANIFOLD
4 O'CLOCK POSITION

EPR (PT4.95) MANIFOLD
EGT (TT4.95) THERMOCOUPLE PROBE
10 O'CLOCK POSITION

EGT (TT4.95) THERMOCOUPLE PROBE (REF)
EPR (PT4.95) MANIFOLD
Engine Pressure Ratio Indicating System Component Location
Figure 1 (Sheet 2)

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Engine Pressure Ratio Indicting System - Component Location
Figure 1 (Sheet 3)

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SEE A
SEE B
TAT +21c D-T0 1
1.83 1.83
1.62 1.62
EPR
75.6 75.6 N1
TAI EGT
587587 78 782
N
17.6 17.6 FF
65 65 OIL P 105 105 OIL T 15 15 OIL Q
N21.2 N21.2  VIB
+23c  CABIN ALTITUDE AUTOTHROT DISC
REV 1.83
OUTFLOW VLV L

1.00 1.65
(11 LINES)
CON IGNITION SEATBELTS RECALL STATUS PG 1
15.2  83.7 FL 250 246-324KTS
97  535 623
XB DOWN

21  1581
GEAR
0.0 18.3
12 66
F

5
103 107
L 1915 A N2 P
0.5  N21.2 S
12 DUCT PRESS 12 CAB ALT 7500 RATE+250 TOTAL FUEL345.0 LDG ALT 200A ~P 5.6 TEMP +10c
COMPACTED EICAS DISPLAY
MAIN EICAS DISPLAY AOR B
A
Engine Pressure Ratio Indication Figure 2
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EPR(PT4.95)
PRESSURE PROBE
(10 O'CLOCK - TURBINE
EXHAUST CASE)

Engine Pressure Ratio Indicating System Simplified Schematic
Figure 3

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