(e)  
Set the captain's IRS source select switch to ALTN position.

 (f)  
Make sure the BIT (DISCRETE) 2 shows a 0.

 S 865-870-001
 (2) Set the Captain's IRS select switch back to the NORM position.
 L. IRS Data Bus Test
 S 735-617-001
 (1)  Do the IRS data bus test that follows:
 (a)  Make sure the IRS is operational (Ref 34-21-00)
 
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757 MAINTENANCE MANUAL
 (b)  
Open these circuit breakers on the P11 circuit breaker panel.

 (c)  
11E9, FMC CMPT L

 (d)  
11E30, FMC CMPT R

 (e)  
Set the left IRS mode select switch to the NAV position.

 NOTE: Alignment may take about 10 minutes.
____
 (f)  
Push and hold the TEST switch on the left IRU for at least 10 seconds.

 (g)  
Set the SUBFRAME and WORD for each signal in the IRS DATA BUS SIGNAL table.

 ~.................................................... | IRS DATA BUS SIGNAL | ...................................................... | | TESTER SETUP | | | PARAMETER ........................... TESTER | | | SUBFRAME | WORD | DISPLAY | ...................................................... | LATITUDE | 1 | 42 | 0400 | | | | | | | LONGITUDE | 3 | 42 | 0400 | 2..............…............…............…...........1
 S 865-871-001
 (2)  Return the IRS back to normal.
 M. Captain's EFIS Select Switch Test
 S 735-618-001
 (1)  Do the EFIS switch test that follows:
 (a)  
Make sure the EFIS system is operational (AMM 34-22-00/501).

 (b)  
On the tester, set the SUBFRAME to 1 and the WORD to 32.

 (c)  
Set the Left EFI instrument source select switch to the NORM position.

 (d)  
Make sure the BIT (DISCRETE) 2 shows a 1.

 (e)  
Set the Left EFI instrument select switch to the ALTN position.

 (f)  
Make sure the BIT (DISCRETE) 2 shows a 0.

 S 865-872-001
 (2)  Set the left EFIS switch to the NORM position.
 N. EFIS Data Bus Test
 S 735-619-001
 (1)  Do the EFIS data bus test that follows:
 (a)  
Make sure the EFIS system is operational (AMM 34-22-00/501).

 (b)  
Make sure the L EFIS instrument source select switch is at the NORM position.

 (c)  
Make sure the left IRU is operational (AMM 34-21-00/501).

 (d)  
Set the left IRU source select switch to the NORM position.
　
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本文鏈接地址：757 AMM 飛機維護手冊 儀表 CHAPTER 31 - INSTRUMENTS 1(65)