Stickler Posted October 4, 2024 Posted October 4, 2024 I am not sure if this issue was introduced in 2.9.8.1214, however I haven't noticed it before: When doing a stored heading or BATH alignment and switching the INS power knob to ALIGN while the HEAT light is still illuminated, a later INS refinement/realignment on the ground fails in the sense that any accumulated drift as indicated by the GROUND SPEED dial showing a value > 0 when the aircraft is stationary is NOT reset. The erroneous GROUND SPEED value will instead persist during and after realignment. In stored heading, the INS align lamp will blink after a short period in ALIGN even though the ground speed is not reset to zero. In BATH and ALIGN, the INS align lamp will never reach the blinking state but remain steady only (tested with a 15 minute realignment period). This does not occur with a gyrocompass alignment or if waiting for the HEAT light to extinguish before switching to ALIGN in case of a stored heading alignment. This is especially problematic with Jester and when doing a stored heading alignment since he will report a successful refinement even though the ground speed indication (and probably the entire INS) is still erroneous. This issue also causes (non-heated) stored heading and BATH alignments to lose a lot of their operational value since a later refinement (say in the last chance) is not possible. 1
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