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Old 13th Feb 2018, 16:09   #1 (permalink)
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Join Date: Nov 2007
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needs some help if possible

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


thank you in advance


Pierre
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Old 13th Feb 2018, 16:11   #2 (permalink)
 
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broken hobbs?
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Old 13th Feb 2018, 16:16   #3 (permalink)
 
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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.
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Old 13th Feb 2018, 17:19   #4 (permalink)
 
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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.
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Old 13th Feb 2018, 19:56   #5 (permalink)
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Thank you everyone


Pierre
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Old 14th Feb 2018, 03:48   #6 (permalink)
 
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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
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Old 14th Feb 2018, 04:01   #7 (permalink)
 
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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.
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