(b)  
Make sure the EQUIP COOLING switch on the P5 overhead panel is set to NORM.

 (c)  
Make sure the supply fan and the exhaust fan are on.

 (d)  
Make sure the inboard supply valve, ground exhaust valve and E6/E9 valve are open.

 (e)  
Make sure the bypass valve, inboard exhaust valve and smoke/override valve are closed.

 (f)  
Make sure the 3-way valve is set to C-B (port A closed).

 (g)  
Remove the electrical connector DV447 from the ground exhaust valve.

 (h)  
Make sure that after 32 seconds these messages are shown: ~.................................................. | EICAS Caution | EQUIP COOLING | .................................................... | EICAS Status | EE CLNG GND EXH | 2.........................…........................1

 (i)  
Install the electrical connector DV447 on the ground exhaust valve.

 (j)  
Make sure that these messages are not shown:
 ~..................................................
 | EICAS Caution | EQUIP COOLING |
 ....................................................
 | EICAS Status | EE CLNG GND EXH |
 2.........................…........................1

 S 865-168
 (37) Make sure these circuit breakers are open:
 (a)  
Circuit breaker on the DC power distribution panel, P180: 1) 180F4, EQUIP COOL CONT VALVE

 (b)  
Make sure the ground exhaust valve is closed.

 S 865-169
 (38) Make sure these circuit breakers are closed:
 (a)  
Circuit breaker on the DC power distribution panel, P180: 1) 180F4, EQUIP COOL CONT VALVE

 (b)  
Make sure the ground exhaust valve is open.

 (c)  
Set the EQUIP COOLING switch on the P5 overhead panel to STBY.

 (d)  
Make sure that after 32 seconds there are no equipment cooling messages shown on EICAS.

 (e)  
Make sure the inboard supply valve, inboard exhaust valve and E6/E9 valve are open.

 (f)  
Make sure the 3-way valve is set to C-B (port A closed).

 (g)  
Make sure the bypass valve, ground exhaust valve and
 smoke/override valve are closed.

 (h)  
Remove the electrical connector DV447 from the ground exhaust valve.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-58-00
 ALL  ú ú 07 Page 531 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (i)  
Make sure that after 32 seconds these messages are shown: ~.................................................. | EICAS Caution | EQUIP COOLING | .................................................... | EICAS Status | EE CLNG GND EXH | 2.........................…........................1

 (j)  
Install the electrical connector DV447 on the ground exhaust valve.

 (k)  
Make sure that these messages are not shown: ~.................................................. | EICAS Caution | EQUIP COOLING | .................................................... | EICAS Status | EE CLNG GND EXH | 2.........................…........................1

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

 (m)  
Make sure there are no equipment cooling messages shown on EICAS.

 (n)  
Set the EQUIP COOLING switch on the P5 overhead panel to NORM.

 (o)  
Make sure the ground exhaust valve is closed.

 (p)  
Make sure there are no equipment cooling status messages shown on EICAS.

 (q)  
Remove the electrical connector DV444 from the inboard supply valve.

 NOTE: Ignore the EICAS status message EE CLNG SUPPLY V.
____
 (r)  Remove the electrical connector DB7436 from the supply fan.
　
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