(a)  Circuit breaker on the DC power distribution panel, P180: 1) 180F4, EQUIP COOL CONT VALVE
 S 715-156
 (16)
 Make sure the inboard supply valve and inboard exhaust valve are open.

 (17)
 Make sure the bypass valve is closed.

 S 715-157
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747-400 MAINTENANCE MANUAL
 S 865-158
 (18) Make sure these circuit breakers are closed:
 (a)  Circuit breaker on the DC power distribution panel, P180: 1) 180F4, EQUIP COOL CONT VALVE
 S 715-159
 (19)
 Make sure the inboard supply valve and inboard exhaust valve are closed.

 S 715-160

 (20)
 Make sure the bypass valve is open.

 (a)  Circuit breaker on Power Distribution center-left, P414: 1) 414R30 EQPT COOLING SUPPLY FAN
 S 865-161
 (21) Make sure these circuit breakers are open:
 (a)  
Circuit breaker on the DC Power Distribution panel, P180: 1) 180J4 EQUIP COOL CONT SUPPLY FAN

 (b)  
Make sure the status message EE CLNG SUP FAN is shown on EICAS.

 S 865-162
 (22) Make sure these circuit breakers are closed:
 (a)  
Circuit breaker on the DC Power Distribution panel, P180: 1) 180J4, EQUIP COOL CONT SUPPLY FAN

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

 (c)  
Make sure the supply fan is on.

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

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

 S 865-167
 (23) Make sure these circuit breakers are open:
 (a)  Circuit breaker on the DC power distribution panel, P180: 1) 180H30, EQUIP COOL CONT EXH FAN
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747-400 MAINTENANCE MANUAL
 (b)  Make sure the supply fan is on and the exhaust fan is off.
 S 865-163
 (24) Make sure these circuit breakers are closed:
 (a)  Circuit breaker on the DC Power Distribution panel, P180: 1) 180H30, EQUIP COOL CONT EXH FAN
 S 715-164
 (25)
 Make sure the supply fan and the exhaust fan are on.

 S 865-165

 (26)
 Make sure these circuit breakers are open:

 (a)  
Circuit breaker on Power Distribution center-right, P415: 1) 415R38, EQPT COOLING EXHAUST FAN

 (b)  
Make sure the supply fan is on and the exhaust fan is off.

 (c)  
Make sure the bypass valve and the E6/E9 valve are open.

 (d)  
Make sure the inboard exhaust valve, inboard supply valve, ground exhaust valve and smoke/override valve are closed.

 (e)  
Make sure the status message EE CLNG EXH FAN is the only equipment cooling message shown on EICAS.

 S 865-170
 (27) Make sure these circuit breakers are closed:
 (a)  Circuit breaker on Power Distribution center-right, P415: 1) 415R38, EQPT COOLING EXHAUST FAN
 S 865-171
 (28) Make sure these circuit breakers are open:
 (a)  
Circuit breaker on the DC power distribution panel, P180: 1) 180H30, EQUIP COOL CONT EXH FAN

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

 S 865-166
 (29) Make sure these circuit breakers are closed:
 (a)  
Circuit breaker on the DC power distribution panel, P180: 1) 180H30, EQUIP COOL CONT EXH FAN

 (b)  
Make sure the exhaust fan is on.

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