(39)
 Open the 6E7 IRS DC LEFT circuit breaker on the P6 panel.

 (40)
 Close the 6E8 IRS DC CENTER circuit breaker on the P6 panel.

 S 865-105
 S 865-106
 S 865-107
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 S 865-108
 (41) Set the IRS C mode switch on the MSU to the ATT position.
 (a)  Make sure that >IRS AC CENTER comes into view on the main EICAS display.
 S 865-109
 (42)
 Set the IRS C mode switch on the MSU to the OFF position.

 S 865-110

 (43)
 Open the 6E8 IRS DC CENTER circuit breaker on the P6 panel.

 S 865-111

 (44)
 Close the 6E9 IRS DC RIGHT circuit breaker on the P6 panel.

 S 865-112

 (45)
 Set the IRS R mode switch on the MSU to the ATT position.

 (a)  Make sure that >IRS AC RIGHT comes into view on the main EICAS display.
 S 865-320
 (46) Close these circuit breakers:
 (a)  
P6 Main Power Distribution Panel
 1) 6D7, IRS AC LEFT
 2) 6D8, IRS AC CENTER
 3) 6D9, IRS AC RIGHT
 4) 6E7, IRS DC LEFT
 5) 6E8, IRS DC CENTER

 (b)  
P7 Overhead Circuit Breaker Panel
 1) 7F9, EIU L
 2) 7F10, EIU C

 F. IRS Alignment
 S 865-248
 (1)  
Set all the IRS mode switches on the MSU to the OFF position.

 S 715-249

 (2)  
Align the IRS (AMM 34-21-00/201).

 G. Put the Airplane Back to Its Usual Condition
 S 865-250
 (1)  
If you do not want to use the IRS, set the mode switches on the MSU to the OFF position.

 (2)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 845-251
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747-400 MAINTENANCE MANUAL
 TASK 34-21-00-715-219
 3.  Ground Test - Inertial Reference System_______________________________________
 A. General
 (1)  The ground test of the Inertial Reference System displays outputs from the inertial reference units on the primary flight displays and the navigational displays. At this time, failures are not recorded.
 B. References
 (1)  AMM 24-22-00/201, Manual Control
 C. Access
 (1)  Location Zones
 221 Control Cabin, LH
 222 Control Cabin, RH

 D. Prepare for the Test
 S 865-215
 (1)  Make sure these circuit breakers are closed:
 (a)  
P6 Main Power Distribution Panel
 1) 6D7, IRS AC LEFT
 2) 6D8, IRS AC CENTER
 3) 6D9, IRS AC RIGHT
 4) 6E7, IRS DC LEFT
 5) 6E8, IRS DC CENTER
 6) 6E9, IRS DC RIGHT
 7) 6E32, C IRS DISCONNECT

 (b)  
P7 Overhead Circuit Breaker Panel
 1) 7F8, UPR EICAS
 2) 7F9, EIU L
 3) 7F10, EIU C
 4) 7F11, EFIS CONT L
 5) 7F12, ND L
 6) 7F14, LWR EICAS
 7) 7F15, EIU R
 8) 7F16, EFIS CONT R

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 9) 7F17, ND R
 S 865-216
 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 865-247

 (3)  
　
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