The current tach time along with an offset are used to calculate the current TTAF (Total time airframe) and TSMOH (Time since major overhaul - for the engine).
These fields are entered on the resource information page for each aircraft in the Scheduled Maintenance section as pictured above.
TTAF Offset = Current TTAF minus current tach (or both numbers as of the same date).
TSMOH Offset = Current TSMOH minus current tach (or both numbers as of the same date). This number is probably negative or 0.
TSMOH Offset (Right) = Current TSMOH of right engine minus current tach of right engine (or both numbers as of the same date). This number is probably negative or 0. This field will only be visible if the class has MEL (multi-engine land) somewhere in the field.
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