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  • To be honest.... I was trying to eliminate a hydraulic reversible pump change. Fairly nasty job in center wheel well. We had to change it anyway.
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  • Mark created a new forum post in ATA 23 Communication
    A/C just out of "C" check. Both mask mics inop.

    After some digging, found wires one and two swapped at back of stowage box plugs.

    This reverse bias's the microphone and it will not work.






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  • Mark created a new forum post in Electrical and Wiring
    We had a discripency on ordering the right type of plugs for one of the gear junction boxes. Some aircraft had 2206 and 2210 mixed up.

    We needed a double master keyway type plug for P2206J when we ordered out of the IPC, we received a single keyway plug.

    I'm just adding this to the site for reference: The double keyway plug is actually the 2210 part number.

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  • Mark created a new forum post in ATA 34 Navigation
    Crew report of the Standby Airspeed indication reading high.

    As discussed here , cabin pressure leaks into a static system will cause an altimeter to read low in flight. When there is a leak on the pitot side, airspeeds will indicate high.

    For some reason..... Boeing runs two alternate static lines and two pitot sense lines from the front of the aircraft to a Elevator Feel Actuator (limits elevator movement at high speeds) behind the aft pressure dome. We isolated our leak to one of the pitot lines running to the back of the aircraft.

    We had to do some serious gutting of the aircraft to expose the lines running towards the back. By process of elimination (disconnecting and plugging the line at different points) we found this in the left sidewall about 10 feet aft of the main cargo door.



    This is 3/8" OD tubing. That hole was so big, leak detector didn't bubble at all.

    Actual isolation involved applying pressure into the system with a pitot/static test box. We used 300 Knts as a test speed. Of the sections we had connected, we knew we still had the leak in our line just by watching how fast the tester was able to reach 300. If it was slow to increase.... we still had our leak. Removing test pressure caused the test box indication to go from 300 to 0 in about two seconds.
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  • Mark created a new forum post in ATA 29 Hydraulic Systems
    Left system electric hydraulic pump inop.


    Pump had thermally shut down and it was too hot to touch.

    After some cool-down time it did function again.

    Usually, when a three phase motor is missing a phase it will run, but it tends to get hot because of the lack of power on one input leg.

    In our case, the "B" phase pump pin and matching plug socket were fried.


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