Panel (ACP). 2) Push and hold a Push-to-Talk (PTT) switch.
 NOTE: If the PTT is a R/T-INT switch, use the R/T
____
 position.

 3) Make sure that bit 26 is set to a 1.
 4) Release the PTT switch.
 5) Make sure that bit 26 changes to a 0.

 (d)  
Do a test of the VHF-C keyline discrete:
 1) Push the MIC CALL switch for VHF-C on an ACP.
 2) Push and hold a PTT switch.
 3) Make sure that bit 25 is set to a 1.
 4) Release the PTT switch.
 5) Make sure that bit 25 changes to a 0.

 (e)  
Do a test of the VHF-R keyline discrete:
 1) Push the MIC CALL switch for VHF-R on an ACP.
 2) Push and hold a PTT switch.
 3) Make sure that bit 24 is set to a 1.
 4) Release the PTT switch.
 5) Make sure that bit 24 changes to a 0.

 S 735-078
 (3)  Do a test of the HF keyline discrete:
 (a)  
Tune the HF transceivers to an approved test frequency.

 (b)  
Set the CMC to show octal label 270, SDI 00 from CMC port 20 in binary (C/20/270/00).

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747-400 MAINTENANCE MANUAL
 (c)  
Do a test of the HF-L keyline discrete:
 1) Push the MIC CALL switch for HF-L on an ACP.
 2) Push and hold a PTT switch.
 3) Look at bit 26.
 4) Make sure that the bit is set to a 1.
 5) Release the PTT switch.
 6) Make sure that the bit changes to a 0.

 (d)  
Do a test of the HF-R keyline discrete:
 1) Push the MIC CALL switch for HF-R on an ACP.
 2) Push and hold a PTT switch.
 3) Look at bit 24.
 4) Make sure that the bit is set to a 1.
 5) Release the PTT switch.
 6) Make sure that the bit changes to a 0.

 S 735-079
 (4)  Do a test of the accelerometer:
 (a)  
Remove the accelerometer (AMM 31-31-03/401).

 (b)  
Connect electrical connector DX393 to the accelerometer.

 (c)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 1)  P180 DC Power Distribution Panel
 a) 180J26 FLT RCDR DC

 (d)  
Do a test of the vertical acceleration signal: 1) Set the CMC to show octal label 340, SDI 00 from CMC port

 20 in hexidecimal (C/20/340/00).
 2)  Hold the accelerometer in its usual position.
 3)  Make sure the Input Monitoring display is X73E0007 to
 X7B10007.
 4)  Hold the accelerometer with its top side down.
 5)  Make sure the Input Monitoring display is X3D40007 to
 X4400007.
 (e)  Do a test of the lateral acceleration signal: 1) Set the CMC to show octal label 341, SDI 00 from CMC port
 20 in hexidecimal (C/20/341/00). 2) Hold the accelerometer in its usual position.
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747-400 MAINTENANCE MANUAL
 3)  Make sure the Input Monitoring display is X8180087 to
 X88C0087. 4) Hold the accelerometer with its left side up (-1G). 5) Make sure the Input Monitoring display is X06A0087 to
 X0DE0087.
 (f)  Do a test of the longitudinal acceleration signal: 1) Set the CMC to show octal label 343, SDI 00 from CMC port
 20 in hexidecimal (C/20/343/00). 2) Hold the accelerometer in its usual position. 3) Make sure the Input Monitoring display is X81800C7 to
 X88C00C7. 4) Hold the accelerometer with its forward side up (+1G). 5) Make sure the Input Monitoring display is XFC600C7 to
 XFFF00C7.
 (g)  
Install the accelerometer (AMM 31-31-03/401).

 (h)  
Make sure this circuit breaker is closed:

 1)  P180, DC Power Distribution Panel
　
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