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A hyd lo  msg. no.  A hyd  LATCHED:  Possible Causes: 
off flt  22-21026  off/wire  NO  . Flt control A low pressure light did not extinguish during YDC BITE pressure reducer test . Operator error . Flight control system A pressure switch . Yaw damper coupler Troubleshooting: . Pressurize A system hydraulics . Verify that flt control A switch is in the ON position. . Verify that flt control A low pressure light is off. . Verify wiring between D295 socket 57 and flt control A low pressure light. . Inspect D295 socket 57 and YDC electrical connector for bent or broken pins, contamination, or damage. . Perform the yaw damper coupler installation test, ref AMM12-12-01, page 401 step 4. . If problem persists, replace yaw damper coupler. 

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External input faults, detected by YDC or external LRU 
B hyd  msg. no.  B hyd off  LATCHED:  Possible Causes: 
off  22-21027  YES  . Low pressure in B system hydraulics . Yaw damper coupler Troubleshooting: . Pressurize B system hydraulics. . Verify that flt control B switch is in the ON position. . Verify that flt control B low pressure light is off. . Perform the yaw damper coupler installation test, ref AMM12-12-01, page 401 step 4. . If problem persists, verify wiring between D295 socket 7 and D816 socket 3 at the flight control system B pressure switch. . If problem persists, verify connection to ground at D816 socket 2 at the flight control system B pressure switch. . If problem persists, replace yaw damper coupler. 
AS in  msg. no.  FDE:  AS src  LATCHED:  TYPE:  Possible Causes: 
fault  22-21031  YD disenga  /wrg/YDC  NO  . Air data computer-1 . Yaw damper coupler Troubleshooting: . Verify that air data computer-1 is installed. . Verify wiring between D295 socket 40, D295 socket 41, D295 socket 42, D295 socket 43, and air data computer-1. . If problem persists, replace air data computer-1. . If problem persists, replace yaw damper coupler. 
PR snsr  msg. no.  PR snsr  LATCHED:  TYPE:  Possible Causes: 
in fault  22-21034  /wrg/YDC  NO  . Pressure reducer bypass valve . Yaw damper coupler Troubleshooting: . Verify resistance from D295 socket 31 to ground is 60 ohms. . Verify wiring between D295 socket 31 and D7377 socket 1 at the pressure reducer bypass valve solenoid. . Verify connection to ground from D7377 socket 2 at the pressure reducer bypass valve solenoid. . Verify wiring at the pressure reducer bypass valve : D295 socket 51 and D737 socket 3 D295 socket 52 and D737 socket 2 . Verify connection to ground from D737 socket 1 at the pressure reducer bypass valve. . Inspect electrical connectors for bent or broken pins, contamination, or damage. . If problem persists, replace the pressure reducer bypass valve. . If problem persists, replace yaw damper coupler. 

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LRRA miscompr  msg. no. 22-21041   LRRA #1 /LRRA #2  LATCHED: NO  TYPE:  Possible Causes: . Radio altimiter-1 and radio altimiter-2 radio height disagree . Yaw damper coupler Troubleshooting: . Troubleshoot radio altimiter-1 and radio altimiter-2. . Verify wiring between D295 and radio altimiter-1 D295 socket 13 and D101B socket 12 D295 socket 21 and D101B socket 46 D295 socket 24 and D101B socket 47 . Verify wiring between D295 and radio altimiter-2 D295 socket 39 and D103B socket 12 D295 socket 22 and D103B socket 23 D295 socket 54 and D103B socket 22 . If problem persists, replace yaw damper coupler. 
Uncorrelated response monitor trips 
　
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