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Thread: Flight Hour Meter Pressure Switch

  1. #1

    Flight Hour Meter Pressure Switch

    Greetings All,

    I was browsing through my maintenance manual (Sport 150 MB-901) and
    came across an electrical drawing for the Cigar Lighter and Flight Hour
    Meter circuit (Page 4-76 169-590015G5). It shows a "Flight Hour Meter
    Pressure Switch" I was just wondering what pressure (oil, Pitot
    Static?) is this needing to make the circuit. I was under the
    assumption that our Hobbs runs as soon as the master is turned on. Not
    a big deal, seems to be clocking OK. Just curiosity as I hardly use
    the thing anymore.

    Thanks Much

    Gary H
    N2012K

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  2. #2

    Flight Hour Meter Pressure Switch

    > Greetings All,
    >
    > I was browsing through my maintenance manual (Sport 150 MB-901) and
    > came across an electrical drawing for the Cigar Lighter and Flight Hour
    > Meter circuit (Page 4-76 169-590015G5). It shows a "Flight Hour Meter
    > Pressure Switch" I was just wondering what pressure (oil, Pitot
    > Static?) is this needing to make the circuit. I was under the
    > assumption that our Hobbs runs as soon as the master is turned on. Not
    > a big deal, seems to be clocking OK. Just curiosity as I hardly use
    > the thing anymore.

    *** Usually oil pressure. When you have oil pressure, you know for sure
    that the engine's running. So you can use it to schedule maintenance,
    charge for run time, etc.

    - Jerry Kaidor


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  3. #3
    An oil pressure hobbs time is good for charging for use except for the following case.

    In a muli-engine aircraft used for training, if an engine is shut down then the clock stops ticking. Instructors will usually figure this out and shut down the other engine because they get paid based on the time.

    Maintenance is only required based on flight hours so time spent on the ground is wasted time. My Duchess has a switch similar to a stall warning switch mounted underneath that is activated by air flow to run a special hobbs meter used for maintenance. Helicopers that I fly have a switch on the collective.

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