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The Hobbs meter is an instrument measuring elapsed time that is used extensively in aviation The meter is used for a number of time-related aviation record-keeping functions such as log book records, airframe hours, and engine running times.

The Hobbs meter generally returns measurement increments of one hour and 1/10 of an hour and displays the results on a rotary odometer readout.

Also known as an hour meter - this instrument is electrically driven and may be activated in several ways to record specific event sequence periods according to the user's unique requirements.

Common activation methods to start the timing process include the master switch, oil pressure, and undercarriage pressure switch signals.

Aircraft for hire companies also use these instruments to calculate client hourly charges.

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14y ago

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