1)  Make sure that both outflow valves move to the closed position.

 (d)  
Set the switch on the breakout box to NORMAL.

 1)  Make sure that both outflow valves move to the open position.
 S 085-022
 (4)  Remove the ICU altitude switch breakout box:
 (a)  Open these circuit breakers:
 1)  P6 Main Power Distribution Panel
 a) 6L6, CABIN PRESS MAN L

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747-400 MAINTENANCE MANUAL
 b) 6L7, CABIN PRESS MAN R c) 6J28, CABIN PRESS AUTO A d) 6J29, CABIN PRESS AUTO B e) 6J30, CABIN PRESS ICU CONT L f) 6J31, CABIN PRESS ICU CONT R
 2)  P414 Left Power Distribution Center a) 414M8, CABIN PRESS ICU L b) 414B8, CABIN PRESS ICU R
 (b)  
Remove the ICU altitude switch breakout box from the ICU's and the connectors DM7950B and DM7951B.

 (c)  
Install connector DM7950B on the left ICU and DM7951B on the right ICU.

 (d)  
Close these circuit breakers:

 1)  P6 Main Power Distribution Panel a) 6L6, CABIN PRESS MAN L b) 6L7, CABIN PRESS MAN R c) 6J28, CABIN PRESS AUTO A d) 6J29, CABIN PRESS AUTO B e) 6J30, CABIN PRESS ICU CONT L f) 6J31, CABIN PRESS ICU CONT R
 2)  P414 Left Power Distribution Center a) 414M8, CABIN PRESS ICU L b) 414B8, CABIN PRESS ICU R
 H.  Do the CPCS EICAS Messages Test
 S 715-025
 (1)  Make sure that there is controller A failure indication:
 (a)  
Open 6J28 CABIN PRESS AUTO A circuit breaker on the P6 Main Power Distribution Panel. 1) Make sure that the EICAS status message CABIN ALT AUTO A

 shows.

 (b)  
Close 6J28 CABIN PRESS AUTO A circuit breaker on the P6 Main Power Distribution Panel. 1) Make sure that the EICAS status message CABIN ALT AUTO A

 does not show.
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 S 715-027
 (2)  Make sure that there is controller B failure indication:
 (a)  
Open 6J29 CABIN PRESS AUTO B circuit breaker on the P6 Main Power Distribution Panel. 1) Make sure that the EICAS status message CABIN ALT AUTO B

 shows.

 (b)  
Close 6J29 CABIN PRESS AUTO B circuit breaker on the P6 Main Power Distribution Panel. 1) Make sure that the EICAS status message CABIN ALT AUTO B

 does not show.
 S 715-029
 (3)  Make sure that there is failure indication of controllers A and B together:
 (a)  
Open 6J28 CABIN PRESS AUTO A and 6J29 CABIN PRESS AUTO B circuit breakers on the P6 Main Power Distribution Panel. 1) Make sure that the EICAS caution message CABIN ALT AUTO

 shows. 2) Make sure that the EICAS status messages CABIN PRESS AUTO A and CABIN PRESS AUTO B show.

 (b)  
Close 6J28 CABIN PRESS AUTO A and 6J29 CABIN PRESS AUTO B circuit breakers on the P6 Main Power Distribution Panel. 1) Make sure that the EICAS caution message CABIN ALT AUTO

 does not show. 2) Make sure that the EICAS status messages CABIN PRESS AUTO A and CABIN PRESS AUTO B do not show.
 I. Do the Cabin Altitude Display and Warning Test
 S 865-080
 (1)  Push the BARO control on the captain's and first officer's EFIS control panels. This will set the PFD barometer readouts to
 29.92 IN.
 S 485-081
 (2)  Connect the vacuum harness to the vacuum source and to the bayonet coupling on the face of each cabin pressure controller.
 (a)  Open the shutoff valve on the harness.
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