(k)  
Put the AFT cargo fire switch to the unarmed position.

 (l)  
Make sure that both fans operate.

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 21-26-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 WARNING: YOU MUST CAREFULLY FOLLOW THE STEPS IN THE SPECIFIED TASK
_______ TO PUT THE AIR/GROUND RELAY SYSTEM IN THE AIR MODE. FAILURE TO FOLLOW THE STEPS CORRECTLY CAN CAUSE THE AUTOMATIC OPERATION OF THE AIRPLANE SYSTEMS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (m)  
Do the "Put the Air/Ground Relay System in the Air Mode" task (AMM 32-09-02/201).

 (n)  
Make sure that both fans do not operate.

 (o)  
Put the LOWER LOBE CARGO COND AIR FLOW RATE selector on the P461 panel to AFT LOW.

 (p)  
Put the pack 2 selector to NORM.

 (q)  
Get access to the pack 2 flow control valve and disconnect the electrical connector, DV94 from the flow control valve.

 (r)  
Make sure that both fans do not operate.

 (s)  
Reconnect the electrical connector on the valve.

 (t)  
Make sure that both fans operate.

 E. Put the Airplane Back to its Usual Condition
 S 865-090
 (1)  
Put the pack 2 switch to OFF.

 S 865-091

 (2)  
Put the LOWER LOBE CARGO COND AIR FLOW RATE selector on the P461 panel to OFF.

 S 865-092

 (3)  
Do the "Put the Air/Ground Relay System Back in the Ground Mode" task (AMM 32-09-02/201).

 S 865-093

 (4)  
Put the aft cargo VENT FANS switch to OFF.

 (5)  
Close the aft or the bulk cargo door.

 (6)
Close the air conditioning bay access door (AMM 06-09-02/201).

 S 865-096

 (7)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 S 865-094
 S 415-095
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1.

2.

3.

A
747-400 MAINTENANCE MANUAL
 ECS MISCELLANEOUS CARD - REMOVAL/INSTALLATION
_____________________________________________General
_______
 A.  The procedure contains two tasks, one for removal and one for installation of the Enviromental Control Systems (ECS) miscellaneous card.
 B.  The ECS miscellaneous card is installed in the M7603 electrical systems card file in the main equipment center.
 TASK 21-26-02-004-001
ECS Miscellaneous Card Removal (Fig. 401)

______________________________

 A.  References
 (1)  
20-41-02/201, Electrostatic Discharge Sensitive Devices

 (2)  
IPC 73-21-80 Fig. 1

 (3)  
SSM 21-23-09

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

 C.  Procedure
 S 864-002
 (1)  Open the circuit breaker 6J33 ECS MISC PC ASSY on the P6 main power distribution panel.
 S 024-012
 CAUTION:_______CAUTION: DO NOT TOUCH THE CARD BEFORE YOU DO THE STATIC GROUNDING PROCEDURE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE CARD. THE ECS MISCELLANEOUS CARD IS AN ELECTROSTATIC DISCHARGE SENSITIVE DEVICE AND COULD BE DAMAGED.
 (2)  Remove the ECS miscellaneous card from the M7603 forward electrical systems card file (AMM 20-41-02/201).
 TASK 21-26-02-404-004ECS Miscellaneous Card Installation
___________________________________
 A.  References
 (1)  
21-31-00/501, Cabin Pressure Control System

 (2)  
24-22-00/201, Manual Control

 (3)  
IPC 73-21-80 Fig. 1

 (4)  
SSM 21-23-09

 B.  Access
　
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