TM 55-1510-222-10 Table 3-6.  INS Malfunction Codes Malf Modes of Recommended Code Failed Test Operation Action Code 10 Invalid heading ALIGN 04 11 GR/CS program pin connected in error ALIGN 01 12* Canned altitude profile in use (input altitude invalid) ALIGN, NAV 05 13 Y velocity change NAV 02 14 X velocity change NAV 02 15 Torque limited ALIGN, NAV 02 16 Invalid pitch and roll ALIGN, NAV 05 17 Invalid magnetic heading ALIGN, NAV 05 18 Excessive saturation time ALIGN 04 20* Bearing to waypoint ALIGN, NAV 03 22* Bearing to waypoint ALIGN, NAV 03 23* Drift angle ALIGN, NAV 03 24* Steering converter ALIGN, NAV 03 25* True heading converter ALIGN, NAV 03 26* XTK converter ALIGN, NAV 03 27* Tick mark too fast STBY 01 31 Ground speed NAV 02 STBY, ALIGN, 02 32 Memory parity NAV NAV 33 Azimuth stabilization loop ALIGN, NAV 01 34 Inner roll stabilization loop ALIGN, NAV 01 35 Pitch stabilization loop ALIGN, NAV 01 36 Accelerometer loop ALIGN, NAV 01 37 Z platform overtemperature NAV 01 38 XY platform overtemperature NAV 01 40 Heading error ALIGN 04 42 Drift angle 450 NAV 02 44 Azimuth gyro drift rate ALIGN 02 45 Gyro scale factor or loaded altitude ALIGN 04 47 15-second loop NAV 02 49 Fix measurement too large NAV 02 51* Excessive wind ALIGN, NAV 05 STBY, ALIGN, 54* Incomplete conversion from UTM to L/L STBY, ALIGN 05 57 XY platform rotation rate ALIGN 02 STBY, ALIGN, 59 600 millisecond loop NAV 02 60 X or Y sample and hold change ALIGN 04 62 XY platform rotation rate NAV 02 STBY, ALIGN, 63 CDU self-checks STBY, ALIGN, 02 NAV * Failed test does not Illuminate WAHN light on CDU. 3-67