engine 5

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  • Joined 4 years ago
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  • Maryland, United States
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  • Mark updated his profile
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  • Mark created a new forum post in ATA 29 Hydraulic Systems
    Ram Air Turbine "Pressure" indication on overhead with center hydraulic pumps on.



    (Light on via lamp test.)


    Module replaced in right wheel well. No help.



    Check valve in left wheel well replaced also. Still had light with center hydraulic pumps on.

    All previous manual runs of turbine were short in duration. Finally ran the unit for 2+ minutes. Fault corrected itself. Possible vapor lock in turbine unit or feed lines????



    Lesson learned. If problem ever reoccurs, dropping the turbine along with a long run time will be tried "first". Both the control module and check valve replacements were not fun (and not needed).

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  • Mark replied to the topic ATA 33-40, Logo Lights in ATA 33 Lights
    Both lights will be inop if you pull the inner assembly and see "this".

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  • Mark created a new forum post in ATA 33 Lights
    There are two logo lights installed on each side of the horizontal stabilizer. The inner light has a step-down transformer incorporated in the assembly. This transformer takes the 115VAC input down to 13VAC which is used by the lights themselves.



    The outer light is wired across to the inner assembly's transformer for its 13VAC power.



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  • The system incorporates a couple of in-line filters used on both the sensor signal output and ground wires.



    The filters are a capacitor wired to ground on one leg and an inductor wired in series. They are located in the stabilizer jackscrew area at rear of aircraft.




    We had an aircraft with quite a history of the left elevator position indication being intermittent. A sensor change did not correct the issue. It turned out to be the output signal filter that was causing the problem.

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  • Mark created a new forum post in ATA 27 Flight Controls
    Intermittent EICAS failure warning of the Auto-Speedbrake system.



    Found an associated relay K218 (P33 Panel) that had a bad coil. It would act like a car blinker. The coil got hot and went open. It would cool down again and activate the relay.



    767-300 WDM 27-62-11
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