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 2)  AIRPLANES WITH -122 YDM AND SUBSEQUENT YDM DASH NUMBERS; If any IRU input, comparison, or preflight test monitor fault is detected, the corresponding IRU fault message is recorded.
 3)  If the airplane is airborne, input faults are latched. The monitors are reset by the power-up reset, IRU auto-reset, or the maintenance reset.
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MAINTENANCE MANUAL

 4)  AIRPLANES WITH YDM DASH NUMBERS -101 THRU -121; The IRU faultball is only reset by the IRU auto-reset or maintenance reset.
 5)  IRU data is declared unacceptable if: a) Two out of three IRUs have comparison faults b) An input fault and a comparison fault are detected. c) All IRUs have input faults
 6)  When IRU data is declared unacceptable, the yaw damper channel goes INOP and is auto-disengaged. An IRU auto-reset is generated with the airplane in-air and the yaw damper not in an INOP status. If sensor data within monitor threshold is detected for 10 seconds, the IRU fault latch is reset, provided there have been no more than four resets since the airplane was on the ground. The maintenance reset is generated by the YDM front panel RESET switch.
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YAW DAMPER SYSTEM
COMPONENT  FIG. 102 SHT  QTY  ACCESS/AREA  REFERENCE 
ACCELEROMETER - MODAL SUPPRESSION L, M10734 1  2  1  822, AFT CARGO DOOR, AFT CARGO COMPT CEILING  22-21-05 
ACCELEROMETER - MODAL SUPPRESSION R, M10735 1  2  1  822, AFT CARGO DOOR, AFT CARGO COMPT CEILING  22-21-05 
CIRCUIT BREAKERS - 1  FLT COMPT, P11  *
 CSEU 1L AC (OR FLT CTRL ELEC 1L AC), C1538 1  11C6  *
 CSEU 1L DC (OR FLT CTRL ELEC 1L DC), C1534 1  11C7  *
 CSEU 1R AC (OR FLT CTRL ELEC 1R AC), C1536 1  11G17  *
 CSEU 1R DC (OR FLT CTRL ELEC 1R DC), C1531 1 11G18  * 
CSEU 2L AC (OR FLT CTRL ELEC 2L AC), C1537 1  11C8  *
 CSEU 2L DC (OR FLT CTRL ELEC 2L DC), C1533 1  11C9  *
 CSEU 2R AC (OR FLT CTRL ELEC 2R AC), C1535 1  11G27  *
 CSEU 2R DC (OR FLT CTRL ELEC 2R DC), C1532 1 11G28  *
 YAW DAMPER L, C1560  1  11A18  *
MODULES - (27-09-00/101) COMPUTERS - (34-12-00/101) COMPUTERS - (31-41-00/101) LEFT POWER SUPPLY 1, M536 LEFT POWER SUPPLY 2, M537 RIGHT POWER SUPPLY 1, M538 RIGHT POWER SUPPLY 2, M539 YAW DAMPER R, C1561 EICAS L, M10181 EICAS R, M10182 AIR DATA R, M101 AIR DATA L, M100  1  11F34  *
　
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