A

757 MAINTENANCE MANUAL
 (b)  
Make sure the IRS is operational (AMM 34-21-00/501).

 (c)  
Set the IRS mode select switch to the Nav mode.

 (d)  
Make sure at least one IRU is ALIGNED.

 (e)  
Make sure the left and right yaw dampers are not engaged.

 (f)  
On the tester, set the SUBFRAME to 0 and the WORD to 60.

 (g)  
Make sure the BIT (DISCRETE) 1 shows a 0.

 (h)  
Engage the left yaw damper (AMM 22-21-00).

 (i)  
Make sure the BIT (DISCRETE) 1 shows a 1.

 (j)  
Disengage the left yaw damper (AMM 22-21-00).

 (k)  
On the tester, set the WORD to 33.

 (l)  
Make sure the BIT (DISCRETE) 1 shows a 0.

 (m)  
Engage the right yaw damper (AMM 22-21-00).

 (n)  
Make sure the BIT (DISCRETE) 1 shows a 1.

 (o)  
Disengage the right yaw damper (AMM 22-21-00/501).

 S 865-819-002
 (2) Set the yaw damper system to the usual condition (AMM 22-21-00/501).
 U. VHF Omnidirectional Range (VOR) Data Bus Test
 S 735-743-002
 (1)  Do the VOR data bus test that follows:
 (a)  
Make sure the VOR is operational (AMM 34-51-00).

 (b)  
Set the frequency to 110.00 MHZ on the left VOR control panel.

 (c)  
Set the SUBFRAME to 1 and the WORD to 30.

 (d)  
Make sure the tester display shows 4000 or 4001.

 (e)  
Set the frequency to 109.60 MHZ on the right VOR control panel.

 (f)  
Set the WORD to 31.

 (g)  
Make sure the tester display shows 2260 or 2261.

 S 865-744-002
 (2)  Set the VOR control panel back to normal (AMM 34-51-00).
 V. Master Warning Test
 S 735-713-002
 (1)  Do the master warning test that follows:
 (a)  
Make sure these circuit breakers on the overhead circuit breaker panel, P11, are closed: 1) 11A31, IND LTS TEST 2) 11A34, IND LTS 3 3) 11F4, GND PROX CMPTR

 (b)  
On the tester, set the SUBFRAME to 0 and the WORD to 29.

 (c)  
Momentarily set the test switch on the miscellaneous test panel to the GND PROX position.

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

 (e)  
Push the MASTER WARNING light switch.

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

 
 GUN 001-008, 010, 101 POST-EO B531006;  ú 31-31-00
 GUN 051, 102-999  ú CONFIG 2 ú 06 Page 519 ú Sep 28/01
　
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