TM 1-1510-223-10 3-42           Change 3 Table 3-4.  Digital Flight Control System Error Codes FZ-450 Error Codes Err 00 Processor Reset/Lost Processor Err 35 Trim Test Fail 01 +15 Volt DC Fail 36 Lateral Accelerometer Fail 02 -15 Volt DC Fail 50 Aircraft ID Fail 03 -5 Volt DC Fail 51 Abbreviated Trim Test Fail 04 +10 Volt DC Fail 52 DG Fail 05 LVC Monitor Fail 53 Hardware Fail 06 Sawtooth Monitor Fail 54 VG No. 1 Fail 07 26 VAC Reference Fail 55 VG No. 2 Fail 08 Watchdog Monitor Fail 56 Pitch Current Monitor Fail 09 Interrupt Register Fail 57 Roll Current Monitor Fail 10 A/D End-Around Fail 59 Vertical 11 EEPROM Fail Gyro Comparison Fail 12 PROM Checksum Fail 60 Pitch Servo Loop Fail 13 RAM Read/Write Fail 61 Roll Servo Loop Fail 14 CPU Register Fail 63 Servo Fail 15 CPU Instruction Set Fail 64 Excessive 16 RAM Continuous Fail Lateral Acceleration 17 Essential RAM Checksum Fail 65 Pitch Trim Fail 18 Continuous 66 Excessive A/D and D/A Test Fail Vertical Acceleration 19 Continuous PROM Test Fail 67 Excessive Roll Rate 20 Ticket Fail 68 Wrong Trim Polarity 21 CPU Fail 69 RG Valid Fail 30 Pitch Magnitude 70 26 VAC Crosside Rate Limiter Fail Reference Fail 31 Roll Magnitude 71 AP Disconnect PB Fail Rate Limiter Fail 72 Turn Knob Detent Fail 33 Roll Torque Fail 73 Manual Trim Input Fail 34 Pitch Torque Fail (VS) or indicated air speed (IAS) selected on the mode selector, rotation of the pitch wheel will change the re- spective air data command vertical mode reference (with autopilot engaged or disengaged) which is displayed on the EADI. VS or IAS modes may be cancelled by press- ing the mode button on the mode selector panel. Move- ment of the pitch wheel has no effect with the autopilot coupled to the glideslope. (2)    Bank limit switch-indicator. The BANK LIMIT switch provides a lower maximum bank angle while in the heading select mode. Depressing the bank limit switch- indicator will illuminate the LOW indicator on the switch face. Depressing the switch again will cause the LOW indicator to be extinguished and the autopilot to return to normal bank limits. The lower bank limit is inhibited and the LOW indicator will be extinguished during NAV mode captures. If heading select is again engaged, LOW will again be illuminated on the bank limit switch-indicator. (3)    Soft  ride  switch-indicator.  The  SOFT  RIDE mode  provides  reduced  pitch  and  roll  autopilot  gains while still maintaining stability in rough air. This mode may be used with any flight director mode, but should only be selected ON in turbulence. Depressing the SOFT RIDE switch-indicator will cause the ON indicator to illu- minate on the switch face. (4)    Turn knob. Rotation of the turn knob out of the detent results in a roll command. The roll angle is propor- tional and in the direction of turn knob rotation. The turn knob must be in the detent (center position) before the autopilot can be engaged. Rotation of the turn knob can- cels any other previously selected lateral mode. (5)    Yaw damper switch-indicator. Depressing the yaw damper (YD) switch will engage the yaw damper and illuminate the ENGAGE indicator on the switch face. With the autopilot (AP) and yaw damper (YD) engaged, de- pressing the yaw damper switch-indicator will engage or disengage  the  yaw  damper  only  (autopilot  will  remain engaged).