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  • Mark created a new forum post in Test Equipment
    Just staring to learn how to effectively use the 900AST Time Domain Reflectometer.

    This tester was discontinued years ago, but I know there are plenty still out there.

    There are probably more advanced units available now, but this unit was designed specifically for fault isolation of aircraft wiring.

    As the learning process continues, this post will be updated.

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  • Mark replied to the topic Test Leads in Test Equipment
    Test leads made with thick safety wire doubled up used with these sockets .

    These are great for rack and circuit card connectors where you're not quite able to squeeze your hand in with a regular type of test lead.


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  • Mark created a new forum post in Locations
    Topic-icon 57
    Plug disconnects, wing to spar.

    Second (square) panel inboard from spar.



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  • As they age, they sometimes get pitted and rough on the case. This can come from a combination of external heat, cold, or moisture. Sometimes the internal heat generated by the relay coil itself can add to the external case aging.

    If I find a pitted case, I'm looking at a decade or older relay. This doesn't necessarily mean it's bad...... just old.

    The relay in question above was not that old.
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  • Mark created a new forum post in Proximity Sensors
    Quick two wire proximity sensor check with LCR meter.


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  • Mark created a new forum post in ATA 73 Fuel and Control
    Another case of an intermittent relay on 767's.

    Please reference http://rotate.aero/forum/ata24-767/314-ata-24-33-stby-power-failure-indication for a previous example.


    Intermittent flight/ground idle control relay.

    When the engine was run previously, N2 speed would jump from the mid-60's to 78% and then back down again.There was no defined time sequence for this failure. Engine bleed or electrical loads configurations also had no effect on the engine going to flight idle.

    When this relay (K434, Flt/Gnd control relay) was removed and powered separately, it would cycle on/off.

    This relay is energized on the ground. Failure rates of constantly energized relays seem to be higher than those that are not on the majority of time.




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  • Mark created a new forum post in ATA 30 Ice and Rain Protection
    Around 310 ohms for the sensors and 20 for the heater coil....

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