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  1. Username Protected
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       #1  

    Hydraulic Pressure Low CAS

    We are AOG in KFXE with a Hydraulic Press Low CAS message. We were holding short for about 30 minutes with limited use of the parking brake, weather flow control. We were cleared onto the runway and went to apply the brakes to stop on the runway and got a brake fail. Was able to pull off the runway fortunately and brake with the parking brake.

    we were able to clear the hydraulic CAS per the QRH but the brake fail needed a full electronics reboot. Rebooting cleared everything but of course it all came back within a minute. So we shut down and got the tow of shame.

    the security guy who escorted us says he sees it all the time with high hold short times and that it’s usually an overtemp problem. But we never got an over temp CAS.

    now after getting bounced around the Contact Center phone system finally got to the right person who will hopefully be able to get a team here.



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  2. Username Protected
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    #2  
    Wow bummer…I believe you should set the parking brake and not hold foot pressure. Holding foot pressure will cause the pump to run and get hot…I always use the parking brake when I stop.
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       #3  
    Just wanted to thank everyone who reached out. We were fortunately able to get a couple of Embraer techs to look at it on Friday and after exhaustive checks of everything they concluded nothing was wrong with the Hydraulic System and that it was likely an operational error of having feet on the brakes for 20-30 minutes straight. Basically, don’t do that.

    We flew out of KFXE on Sunday after it stopped flooding with rain and opted to land at KMYR in South Carolina instead of our usual KCRE for the added benefit of 3,500 extra feet. With 25 knots of wind right down the runway I think our touchdown GS was in the 60s or low 70s. Pressing the brakes slowed the plane down and no error messages. A nice uneventful landed.

    The plane then went on to KMHT to be dropped off for the NXi upgrade this week!

    Thanks again for the help!

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    #4  
    (Username Protected) - using the Parking Brake whenever I come to a complete stop was drilled in to me during training. Even if it's just for 30 seconds. Stop-Parking brake On-Taxi light off.
    Stop-Parking brake On-Taxi light off.
    Now it's habit, and now I know why it was drilled in!

    I've also got my 100 in for the NXi upgrade and am planning to pick it up in the next few days. I had it on my Mustang and the screens were so much easier to read and brighter. Makes a huge difference if you're border-line needing glasses!
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       #5  
    we are definitely going to make that our new SOP.

    Where are you getting the NXi done?

    And are you doing any of the optional upgrades at the same time, ADS-B in, audio, radar…?

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  6. Username Protected
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    #6  
    Quote Originally Posted by (Username Protected) View Post
    we are definitely going to make that our new SOP.
    Where are you getting the NXi done?
    And are you doing any of the optional upgrades at the same time, ADS-B in, audio, radar…?
    Western Aircraft in Boise, and I added the GWX 75 radar.
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    #7  
    Quote Originally Posted by (Username Protected) View Post
    (Username Protected) - using the Parking Brake whenever I come to a complete stop was drilled in to me during training. Even if it's just for 30 seconds. Stop-Parking brake On-Taxi light off.
    Stop-Parking brake On-Taxi light off.
    Now it's habit, and now I know why it was drilled in! !
    Good habit!
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       #8  
    Yup - many flights since then, no more CAS. Lesson learned, planes are very far behind the auto industry.

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    #9  
    (Username Protected), hopefully you got the full explanation on the “why” not just the “don’t do that” part. The hydraulic power pac is cooled by RAM air only so sitting on the ground gets little cooling airflow. Holding the brakes causes the pump to continuously circulate and with little air circulation, overheat. Setting the parking brake relies on accumulator pressure, so no pump operation, no overheat. In the 300 and they fixed the problem…
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       #10  
    Thank you (Username Protected), we had not heard exactly why it happens but that makes sense as the pump was very hot to the touch. Did they fix it in the 300 with a fan?

    Thanks again!

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    #11  
    The 300 uses two engine accessory gearbox mounted hydraulic pumps in lieu of the 100's single electric hydraulic pump. The hydraulic system is probably the biggest systematic difference between the 100 and 300. The other major system difference is the 300s more complex bleed air/pressurization/ECS.

    A related item to consider, the 100 does not have gear uplocks. A loss of hydraulic pressure from the single electric pump will result in the landing gear dropping out of the wells. The 300 has two hydraulic pumps and gear uplocks. Something to think about next time you have a long leg over inhospitable terrain or water. What is your range with the gear dragging?
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    #12  
    (Username Protected) explained it better than I could have!

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