Is TBO based on Hobbs or tach?
Is TBO based on Hobbs or tach? The tach on the other hand registers engine time and as an owner I don't care much about Hobbs time for maintainence, I use the tach. It reads revolutions and that is how the manufacturer of the engine sets TBO and other time related maintainence.
How to calculate flight time for logbook?
You will, however, have to perform some mental math or use a calculator when making logbook entries using this format; Each decimal hour (0.1) is equal to 6 minutes, which means your flight minutes will have to be divided by 6 to obtain decimal hours (e.g., a flight of one and a half hours (1:30) = 1. [30/6] = 1.5).