needs some help if possible
Joined: Feb 2006
Aviation Qualifications: LAME
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From: Falling off the end of the thread
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.
Joined: Sep 2003
Posts: 2,081
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From: Redding CA, or on a fire somewhere
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.
Joined: Jun 2009
Posts: 430
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From: South East Asia
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.
