Sorry if this is an old chestnut, but I can't find it anywhere. How do you determine the 100-hour mark on a 912UL when the Hobbs meter is pressure-switched i.e just records flying hours? Do I just take the Hobbs reading, or should I also record my taxi-time and add that to it? After 100 hours flying there could be a 25 per cent discrepancy which don't sound right.
