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SEE A SEE B
78 21 81
N2 X-BLD
17.6 17.6 FF 0.0 18.3
OIL P 65
6665 12
OIL T 105
105 103 107
15 15 OIL Q 19 15 N2
N2 N2 N2
1.2
1.2 VIB 0.5
1.2
MAIN EICAS DISPLAY
AUXILIARY EICAS DISPLAY AB
Engine Tachometer (N1 and N2) Indication
Figure 501

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S 865-006-N00
 (4) Stop the engines (AMM 71-00-00/201).
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ENGINE SPEED CARD - REMOVAL/INSTALLATION
________________________________________
 1.  General
_______
 A.  This procedure includes two tasks. One task is the removal of the engine speed card. The other task is the installation of the engine speed card.
 B.  There are four engine speed cards installed in the electrical systems card file (M7603). The speed cards are identified as follows:
 Engine Number_____________ Equipment Number
 1 YMLA001
 2 YMLA003
 3 YMLA005
 4 YMLA007

 TASK 77-12-01-004-001-N00
 2.  Engine Speed Card Removal (Fig. 401)
_________________________
 A.  References
 (1)  
AMM 20-11-22/401, Rack-Mounted Electrical/Electronic Module

 (2)  
AIPC 73-21-80, Fig. 1

 (3)  
WDM 73-21-71, WDM 73-21-72, WDM 73-21-73, WDM 73-21-74

 (4)  
WDM 77-12-21, WDM 77-12-22

 (5)  
WDM 77-12-23, WDM 77-12-24

 (6)  
SSM 73-21-08, SSM 77-12-21

 B.  
Access

 (1)  
Location Zone 115 Area Between Nose Gear Well and Fuselage, LH

 C.  
Procedure

 S 864-002-N00
 (1)  
For the applicable engine, open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  P6 Main Power Distribution Panel
 1) 6K10 SPEED SENSOR ENG 1 1
 2) 6K11 SPEED SENSOR ENG 1 2
 3) 6K12 SPEED SENSOR ENG 2 1
 4) 6K13 SPEED SENSOR ENG 2 2
 5) 6K14 SPEED SENSOR ENG 3 1
 6) 6K15 SPEED SENSOR ENG 3 2
 7) 6K16 SPEED SENSOR ENG 4 1
 8) 6K17 SPEED SENSOR ENG 4 2

 (2)
Remove the applicable engine speed card (AMM 20-11-22/401).

 S 024-003-N00
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
SEE B
ELECTRICAL SYSTEMS CARD FILE M7603 A
ENGINE 3
ENGINE 1
SPEED CARD
SPEED CARD
(YMLA005)
(YMLA001)
ENGINE 4
SPEED CARD
ENGINE 2
(YMLA007)
SPEED CARD
(YMLA003)
____EEC/TMC CARDS NOT
NOTE: SHOWN FOR CLARITY.
B
Engine Speed Card InstallationFigure 401
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TASK 77-12-01-404-004-N00
 3.  Engine Speed Card Installation (Fig. 401)______________________________
 A. References
 (1)  
AMM 20-11-22/401, Rack-Mounted Electrical/Electronic Module

 (2)  
　
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