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Tach vs Hobbs

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jim(at)PoogieBearRanch.co
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Posted: Tue Mar 14, 2017 7:23 am Post subject: Tach vs Hobbs

<< when the FAA mandates usage-based inspection or maintenance (for

instance, mandatory 100 hour inspections for aircraft used for

instruction) - what is the time that is counted towards those 100 hours?

Is it engine run time, or air time, or tach time, or some other measure?

 	  Quote: 	
		  >


	


Simple answer:  the only recording device on the "required equipment"

list is the tach.  Hobbs meters are optional, and are used to charge

rental customers for their "flight time" (which is truly bogus, because

it's typically about 1.2X the actual flight time for a training flight).



Because tach time was the only "guaranteed to be present" way to measure

time, in the US, all "time-interval" inspections are based on tach time,

including ADs with "every 100 hours" or "every 500 hours" intervals.



And to the OP:  please note that "tach" (with an "H") is short for

"tachometer", not "tackometer"... LOL  



Jim Parker

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