TASK 73-21-12-404-005-N00
 3. Install 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.
Install the Discretes Card for the EEC/TMC

 S 424-006-N00
 (1)  
Install the applicable discretes card for the EEC/TMC
 (AMM 20-11-22/401).

 D.
Put the Airplane Back to Its Usual Condition

 S 864-007-N00
 (1)  
For the applicable engine, remove the DO-NOT-CLOSE tag and close this circuit breaker as follows:

 (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
 5) 6D10 ENG 3 IDLE CONT/TMC DISCRETES
 6) 6H23 PROBE HEAT ENG 3
 7) 6C10 ENG 4 IDLE CONT/TMC DISCRETES
 8) 6H25 PROBE HEAT ENG 4

 S 864-008-N00
 (2)  Remove the DO-NOT-CLOSE tag and close this circuit breaker, 414D25 ENG IDLE CONT, on the main power distribution panel, P414.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
E. Do a Test of the Discretes Card for the EEC/TMC
 S 864-013-N00
 (1)  
Put the applicable EEC MAINT ENG (1, 2, 3, or 4) POWER switch on the P461 panel to the TEST position.

 S 864-012-N00

 (2)  
Get access to the CMCS Input Monitoring (AMM 45-10-00/201).

 S 714-011-N00

 (3)  
Make sure the discretes card transmits the correct signal to the
 Idle bit (Label 275 Bit 21).

 (a)  
For the applicable engine, add these codes:
 ~.....................................
 | ENG | CH | CODE | PAGE |
 .......................................
 | 1 | A | E/082/275/00 | 1/2 |
 .......................................
 | 1 | B | E/090/275/00 | 2/2 |
 .......................................
 | 2 | A | E/084/275/00 | 1/2 |
 .......................................
 | 2 | B | E/092/275/00 | 2/2 |
 .......................................
 | 3 | A | E/083/275/00 | 1/2 |
 .......................................
 | 3 | B | E/091/275/00 | 2/2 |
 .......................................
 | 4 | A | E/085/275/00 | 1/2 |
 .......................................
 | 4 | B | E/093/275/00 | 2/2 |
 2......…......…..............…........1

 (b)  
Make sure the Idle bit 21 shows 0 (fifth bit from the right on the top line).

 (c)  
For the applicable engine, open this circuit breaker and attach the DO-NOT-CLOSE tag: 1) P6 Main Power Distribution Panel

 a) 6H19 Probe Heat Engine 1
 b) 6H21 Probe Heat Engine 2
 c) 6H23 Probe Heat Engine 3
 d) 6H25 Probe Heat Engine 4

 (d)  
Put the Cowl Anti-Ice on the applicable engine to the ON position.

 (e)  
Open these circuit breakers for the air-ground mode and attach the DO-NOT-CLOSE tags: 1) P7 Overhead Circuit Breaker panel

 a) 7F22 Landing Gear Dsp & Cont Pri b) 7F23 Landing Gear Dsp & Cont Altn

 (f)  
Make sure the Idle bit goes to 1.

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