Originally Posted by
pattern_is_full
How is "airbourne time" measured and verified?
At my flight school, most of our aircraft have air switch activated Hobbs meters. Start and finish meter readings are recorded in the aircraft tech log and the calculated airbourn time subsequently transferred to the Engine, Prop and Airframe maintenance logs.
When we fly aircraft which are not fitted with the air switched Hobbs meter, we simply record take off and landing times in addition to the brakes off/brakes on times used for personal flight time logging. Both sets of times are entered in the tech log, but only the take off to landing times are used to calculate airbourn time for the maintenance logs.