needs some help if possible
Join Date: Feb 2006
Location: Hanging off the end of a thread
Posts: 33,021
Received 2,900 Likes
on
1,242 Posts
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.
Join Date: Jun 2009
Location: South East Asia
Posts: 430
Likes: 0
Received 0 Likes
on
0 Posts
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.
