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 5.  Indication (Fig. 2)
__________
 A.  N1 indication is shown on the main EICAS display with a vertical bar graph for each engine and a digital readout, in percent, just above the graph. For more information on N1 indication, refer to Integrated Display System, AMM 31-61-00/001.
 B.  Primary N2 indication signals are received from the EEC and are shown on the auxiliary EICAS display with a vertical bar graph for each engine and a digital readout, in percent, just above the graph. For more information on N2 indication, refer to Integrated Display System, AMM 31-61-00/001.
 6.  Operation (Fig. 3, Fig. 4)
_________
 A.  Functional Description
 (1)  
The EEC speed transducer (N1) generates an inductive signal with a frequency determined by the passing rate of 60 teeth on the LPC/LPT coupling through the coils field, and supplies this signal to the EEC. The EEC sends the signal to the EIU's for display on EICAS.

 (2)  
The EEC receives the N2 speed signal from the frequency of one phase of the power windings output of the EEC alternator. The EEC converts the N2 analog input to a digital signal and sends it to the EIU's.

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE  A  MAIN GEARBOX  EEC ALTERNATOR (N2 TRANSDUCER)  AIR INLET COOLING 
SEE  B 

STATOR
CABLE END
ELECTRICAL
CONNECTORS

FWD
2.9 BLEED VALVE
INTERMEDIATE SOLENOID (REF)CASE LUBRICATION AND SCAVENGE OIL PUMP (REF)
A1
FWD
EEC SPEED TRANSDUCER (N1)
1  IDG AND STARTER NOT SHOWN FOR CLARITY.
B
Engine Tachometer System Component Location
Figure 1 (Sheet 1)

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SEE C
SEE D
ELECTRICAL SYSTEMS CARD FILE M7603 C
ENGINE 3
ENGINE 1
SPEED CARD
SPEED CARD
(YMLA005)
(YMLA001)
ENGINE 4
SPEED CARD
ENGINE 2
(YMLA007)
SPEED CARD
(YMLA003)
NOTE:EEC/TMC CARDS NOT SHOWN FOR CLARITY.
D
Engine Tachometer System Component Location Figure 1 (Sheet 2)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
SEE B
MAIN EICAS DISPLAY
A
TAT +21c D-T0 1 +23c CABIN ALTITUDE
78 21 81
AUTOTHROT DISC
1.83  1.83 REV 1.83 OUTFLOW VLV L
1.62 1.62 1.00 1.65
N2
X-BLD
(11 LINES)
EPR
17.6  17.6 FF 0.0 18.3 CON IGNITION
SEATBELTS RECALL STATUS PG 1
75.6 75.6 N1 15.2 83.7
TAI FL 250 246-324 KTS OIL P
587 587 EGT 97 535 623
65 12
66 N UP GEAR UP
65
XB
78 78 2 21 15 81
17.6 17.6 FF 0.0 18.3 DN DN
OIL T
65 65 OIL P 12 66 105 105 OIL T 103 107 105 105 103 107
F L 5
15 15 OIL Q 19 15
A
15 15 OIL Q 19 15
P
S
N2

N21.2 N21.2 VIB N20.5 N21.2
N2 N2
N2 12 DUCT PRESS 12
1.2
1.2 VIB 0.5
1.2
CAB ALT7500 RATE +250 TOTAL FUEL345.0LBS X
1000LDG ALT 200AUTO ~P 5.6 TEMP +10c
COMPACTED EICAS DISPLAY AUXILIARY EICAS DISPLAY
A OR B B
Engine Tachometer (N1 and N2) Indication
Figure 2

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