EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 73-21-10
 ALL  ú ú N03 Page 407 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
EEC/TMC DISCRETES CARD - REMOVAL/INSTALLATION
_____________________________________________
 1.  General_______
 A.  This procedure includes the instructions to remove and install the
 EEC/TMC discretes card.

 B.  There are four EEC/TMC discretes cards installed in the electrical
 systems card file (M7603). The discretes cards are identified as
 follows:

 ~............................................ | Engine Number | Equipment Number | .............................................. | 1 | YMLA002 | .............................................. | 2 | YMLA004 | .............................................. | 3 | YMLA006 | .............................................. | 4 | YMLA008 | 2....................….......................1
 TASK 73-21-12-004-001-N00
 2.  Remove the EEC/TMC Discretes Card (Fig. 401)_________________________________
 A.  References
 (1)  
AMM 20-11-22/401, Rack-Mounted Electrical/Electronic Module

 (2)  
IPC 73-21-80 Fig. 1

 (3)  
WDM 73-21-12, 73-21-22, 73-21-32, 73-21-42, 73-21-79

 (4)  
SSM 73-21-01, 73-21-07

 B.  
Access

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

 C.  
Prepare to Remove the Discretes Card for the EEC/TMC

 S 864-014-N00
 CAUTION: YOU MUST OPEN THE CIRCUIT BREAKER FOR THE PROBE HEAT ENG 1, 2,
_______ 3, OR 4 IN LESS THAN 10 SECONDS AFTER THE CIRCUIT BREAKER FOR THE ENG 1, 2, 3, OR 4 IDLE CONT/TMC DISCRETES IS OPENED. WHEN YOU OPEN THE CIRCUIT BREAKER FOR THE ENG 1, 2, 3, OR 4 IDLE CONT/TMC DISCRETES, POWER IS SUPPLIED TO THE PT2/TT2 PROBE HEAT. IF YOU DO NOT OPEN THE CIRCUIT BREAKER FOR THE PROBE HEAT ENG 1, 2, 3, OR 4 IN LESS THAN 10 SECONDS, YOU CAN CAUSE DAMAGE TO THE PT2/TT2 PROBE.
 (1)  
For the applicable engine, open this circuit breaker and install the DO-NOT-CLOSE tag:

 (a)  
P6 Main Power Distribution Panel
 1) 6F10 ENG 1 IDLE CONT/TMC DISCRETES
 2) 6H19 PROBE HEAT ENG 1
 3) 6E10 ENG 2 IDLE CONT/TMC DISCRETES
 4) 6H21 PROBE HEAT ENG 2

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 73-21-12
 ALL  ú ú N01 Page 401 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE  A 
SEE  B 
ENGINE
SPEED CARD (REF) 
ELECTRICAL SYSTEMS CARD FILE M7603 
A 
ENG 1 
EEC/TMC 
DISCRETE 
CARD 
YMLA002  ENG 3 
ENG 2  EEC/TMC DISCRETE 
EEC/TMC  CARD 
DISCRETE  YMLA006 
CARD 
YMLA004  ENG 4 
EEC/TMC 
DISCRETE 
CARD 
YMLA008 

B
EEC/TMC Discretes Card Installation Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 73-21-12
 ALL  ú ú N01 Page 402 ú Oct 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
5) 6D10 ENG 3 IDLE CONT/TMC DISCRETES 6) 6H23 PROBE HEAT ENG 3 7) 6C10 ENG 4 IDLE CONT/TMC DISCRETES 8) 6H23 PROBE HEAT ENG 4
 S 864-003-N00
 (2)  
Open this circuit breaker, 414D25 ENG IDLE CONT, on the main power distribution panel, P414, and install the DO-NOT-CLOSE tag.

 D.
Remove the Discretes Card for the EEC/TMC

 S 024-004-N00
　
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