S 865-176
 (5)  Open the 180M3 IRS ON BAT circuit breaker on the P180 panel.
 (a)  Make sure that the IRS ON BAT annunciator on the P461 panel does not come on.
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 (b)  Make sure that the ground crew call horn in the nose gear wheel well does not operate.
 (6)  S 865-178Close the 180M3 IRS ON BAT circuit breaker on the P180 panel.
 (7)  S 865-177Close the 6D7 IRS AC LEFT circuit breaker on the P6 panel.
 (8)  S 865-179Open the 6D8 IRS AC CENTER circuit breaker on the P6 panel. (a) After 10 seconds, make sure that the IRS ON BAT annunciator on the P461 panel comes on. (b) Make sure that the ground crew call horn on the nose gear wheel well operates.
 (9)  S 865-200Close the 6D8 IRS AC CENTER circuit breaker on the P6 panel. (a) Make sure that the IRS ON BAT annunciator on the P461 panel does not come on. (b) Make sure that the ground crew call horn in the nose gear wheel well does not operate.
 S 865-180

 (10) Open the 6D9 IRS AC RIGHT circuit breaker on the P6 panel.
 (a)  
After 10 seconds, make sure that the IRS ON BAT annunciator on the P461 panel comes on.

 (b)  
Make sure that the ground crew call horn in the nose gear wheel well operates.

 S 865-181
 (11) Close the 6D9 IRS AC RIGHT circuit breaker on the P6 panel.
 (a)  
Make sure that the IRS ON BAT annunciator on the P461 panel does not come on.

 (b)  
Make sure that the ground crew call horn in the nose gear wheel well does not operate.

 S 865-182
 (12) Set the master dim and test switch on the P5 panel to the BRT position.
 (a)  Make sure that the IRS ON BAT annunciator on the P461 overhead panel does not come on.
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 S 865-183
 (13) Set the IND LTS switch on the P5 overhead panel to the DIM position.
 (a)  Make sure that the IRS ON BAT annunciator on the P461 overhead panel does not come on.
 S 865-184
 (14) Set the IND LTS switch on the P5 overhead panel to the TEST
 position.

 (a)  Make sure that the IRS ON BAT annunciator on the P461 overhead panel comes on.
 S 865-185
 (15) Release the IND LTS switch.
 (a)  Make sure that the IRS ON BAT annunciator on the P461 overhead panel goes out.
 L. Center IRU Standby Power Disconnect Test
 S 865-186
 (1) Open the 6E32 C IRS DISCONNECT circuit breaker on the P6 panel.
 (a)  After 4.5 to 5.5 minutes, make sure that >IRS DC CENTER comes into view on the main EICAS display.
 S 865-187
 (2) Close the 6E32 C IRS DISCONNECT circuit breaker on the P6 panel.
 (a)  Make sure that the >IRS DC CENTER advisory message goes out.
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 INERTIAL REFERENCE UNIT - REMOVAL/INSTALLATION
______________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is for the removal of an inertial reference unit (IRU). The second task is for the installation of an IRU.
 B.  The left, center, and right IRUs are installed on shelf number 6 in the electronic equipment rack E1.
 TASK 34-21-01-004-001
　
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