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  • Mark created a new forum post in ATA 22 Auto-Pilot
    On the 767, all auto-pilot actuators are the same part. There are nine total. 3 each for pitch, roll, and yaw.
      
      
      

    On each servo there are line replaceable electrohydraulic servo valves and shutoff valves.
      
      
     
      
      
      
      
      
      
      
      
      
      
    We recently had an aircraft with a center auto-pilot that was not engaging.  The MCDP checks showed a failed command circuit for the rudder (or directional) servo. The rudder servos are inside the vertical stabilizer.
      
      
      
      
      
      
      
      
    When the valve was checked from the Center FCC, a reading of approx 1100Ω was seen.
      
      
     
      
      
     
      
      
    You would think "I've got continuity so the valve is good", but that would be wrong.

    There are actually two coils wired in parallel. 1100Ω is the resistance of "one" of the coils.

    When two coils of basically the same value of 1000Ω are wired in parallel, total resistance is about half the value of one.
      
      
     
      
      
    When the replacement valve was plugged in, the value read at the FCC rack dropped to about 500Ω.
      

        
     
      
      
    It should be noted.... the servo (or shut-off) valves plug into the case of the actuator. If we had the same resistance reading with the replacement valve, we would most likely have a open wire internally "in" the actuator. That would suck as now the whole unit would require replacement.
      
      
     
      
      
     
      
     
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  • Mark replied to the topic Leach Relay P/N BACR13CF2A in Relays
    Leach relay P/N BACR13CJ2 causing a cycling "FLAP/SLAT ELEC" warning on the lower EICAS display.
      
      
        
      
      
        

    This is different from the posts above because this one has a 115 VAC coil. All previous intermittent relays were direct current.
      
      
        

    This particular one was failed for about 90 seconds and energized around 10. (I wouldn't have caught it if I wasn't looking at the EICAS screens for another reason.)

    When failed the message was in view.

    I pulled the relay and checked for power (X1) and ground (X2). These inputs never dropped off. I then jumped the 115VAC and a separate hard ground to the removed relay. It dropped off within 10-15 seconds after power was applied.

    A new relay fixed the problem.

    In the schematic below, the EICAS computers do not want to see a ground on "F3" of the "D" plug. If a ground is present..... the warning will display.
    K730 has 115 VAC available all the time. It's looking for a ground to energize. That ground comes from the Flap Slat Electronics Unit on pin "K13" of the "B' plug. If the FSEU is operational, it will provide that ground and there will be no warning present.
      
      
        
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  • Mark created a new forum post in ATA 34 Navigation
    Old, but it still gives some good information.
    Same system on 767.
      

      
     
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  • Glad you got it working, share a picture of your print once it comes out.
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  • SamAero replied to the topic G450 Gear Pin Holder in 3D Printing
    Your awesome! This one looks great.
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  • Actually after looking back in my files I had already started a new one in CAD it has dimensions as well, its slightly bigger than the one i posted above I wanted to slightly increase the size because depending on how the pins were put in they could kind of get stuck. I never finished cleaning it up but attached is another STL and Autodesk file with dimensions. 

    File Attachment:

    File Name: NewPinHolderv1.zip
    File Size:86 KB
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  • SamAero replied to the topic G450 Gear Pin Holder in 3D Printing
    I dont understand what that means... haha
    Thanks for the help, but it is still creating the weird lines on my side.
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  • I think I see your issue, when I open the file in blender and Creality the model is sharp, I opened it in meshmixer and I see the odd lines and fragmented faces. I think it just comes down to the boolean operations destroying the faces. Let me know if your not able to get it to turn out I will re create it in Autodesk tomorrow.
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