(2)
Open the 7C23 FMCS FMC R circuit breaker on the P7 panel.

 (3)
Align the left IRU (AMM 34-21-00/201).

 (4)
Set the IRS C mode switch on the MSU to the ATT position.

 (5)
Set the IRS R mode switch on the MSU to the OFF position.

 S 865-258
 S 865-259
 S 865-260
 S 865-261
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 S 735-262
 (6) Do a test of the IRS source select switch interface.
 (a)
Set the SOURCE SELECT panel as shown in the tables that follow:

 (b)
Make sure the PFD shows the correct indication for each of the

 switch positions. ~................................................................. | Captain's | | | SOURCE SELECT Panel | | ........................... | | EIU Switch | IRS Switch | Captain's PFD | ................................................................... | | | | | L | L | PITCH, ROLL, HDG INDICATIONS PRESENT | | | | | | L | C | HEADING COMPASS BLANK | | | | | | L | R | ATT FLAG DISPLAYED | | | | | | C | L | PITCH, ROLL, HDG INDICATIONS PRESENT | | | | | | C | C | HEADING COMPASS BLANK | | | | | | C | R | ATT FLAG DISPLAYED | | | | | | R | L | PITCH, ROLL, HDG INDICATIONS PRESENT | | | | | | R | C | HEADING COMPASS BLANK | | | | | | R | R | ATT FLAG DISPLAYED | 2............…............….......................................1
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MAINTENANCE MANUAL

 ~................................................................. | First Officer's | | | SOURCE SELECT Panel | | ........................... | | EIU Switch | IRS Switch | First Officer's PFD | ...................................................................
 |  L  |  L  |  PITCH, ROLL, HDG INDICATIONS PRESENT |
 |  |  |  |
 |  L  |  C  |  HEADING COMPASS BLANK  |
 |  |  |  |
 |  L  |  R  |  ATT FLAG DISPLAYED  |
 |  |  |  |
 |  C  |  L  |  PITCH, ROLL, HDG INDICATIONS PRESENT |
 |  |  |  |
 |  C  |  C  |  HEADING COMPASS BLANK  |
 |  |  |  |
 |  C  |  R  |  ATT FLAG DISPLAYED  |
 |  |  |  |
 |  R  |  L  |  PITCH, ROLL, HDG INDICATIONS PRESENT |
 |  |  |  |
 |  R  |  C  |  HEADING COMPASS BLANK  |
 |  |  |  |
 |  R  |  R  |  ATT FLAG DISPLAYED  |

 2............…............….......................................1
 S 865-275
 (7)
Close the 7C1 FMCS FMC L circuit breaker on the P7 panel.

 S 865-276

 (8)
Close the 7C23 FMCS FMC R circuit breaker on the P7 panel.

 S 865-202

 (9)
Set the IRS C mode switch on the MSU to the OFF position.

 S 865-203

 (10)
 Align the center and right IRUs (AMM 34-21-00/201).

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747-400 MAINTENANCE MANUAL
 F.  Prepare for a Test of the Analog Fault Discrete and of the CMC Interface
　
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