needs some help if possible
 

what is the difference between TTSN - 1468 hrs and Hobbs - 268 hours


thank you in advance


Pierre

broken hobbs?

Yes or the Hobbs has been replaced at some point, I do not use the Hobbs reading as it starts when the engine is running as opposed to airborne time. You might also have a Hobbs installed if you have a separate heater onboard, such as a Janitrol, so it could be the reading for that. Or maybe the engine hours if replaced at the same time as the engine.. the total time being the aircrafts.

Hobbs time can be completely different. As already stated, the Hobbs could have been replaced, or you have components that have been replaced. All the aircraft I am familiar with have 2 Hobbs installed, one on thee collective for measuring component times and one on the engine for billing purposes.

Thank you everyone


Pierre

If you do instruction flight and perform a lot of autorotation. Time on hobbs based on the "pitch up" is half than the real flight time ;)

TTSN usually refers to a component or assembly, if you're referring to the aircraft, it's AFTT. What the Hobbs records is dependant on which way it's connected to the aircraft, it may record Time in Service or Flight Time.