Results 1 to 4 of 4
  1. #1
    10+ Posting Member
    Join Date
    Oct 2007
    Location
    Australia
    Posts
    11
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    B747-400 APU rotary switch

    Hi guys,

    I have been unsuccessfully searching for a B747-400 style 3 position APU switch. The problem is getting a switch that spring return from right to center.


    Also, I was wondering if authentic Boeing rotaries have a rotation angle of 30 degrees like the rotaries you buy in the electronics stores.

    Finally, where is the best place to buy Boeing style knobs, I found that they can be rather expensive and I need about 20 of them. To me, they all look the same but are there big quality differences with them? Are they usually designed for a round or D shaft, 6mm or 1/4".

    Kind regards

    Thomas

  2. #2
    25+ Posting Member
    Join Date
    May 2008
    Location
    Perth
    Posts
    40
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: B747-400 APU rotary switch

    Hi Thomas,
    I took and ordinary 3 position switch, say from Altronics and bogged in the 3rd position indent on the inside. With the switch mounted underneath the panel, I drill a hole in the shaft for a small stiff spring at R/A to the shaft. The spring hits a "stop" screw mounted in the backing plate to return the switch to the "on" position.
    I would recommend the knobs from FDS and if you buy the unpainted ones the price is quite reasonable.

    Regards
    Greg

  3. Thanks thomas747400 thanked for this post
  4. #3
    10+ Posting Member
    Join Date
    Oct 2007
    Location
    Australia
    Posts
    11
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: B747-400 APU rotary switch

    Hi Greg,

    Thanks for the reply! I think I get the concept... any chance of posting a picture? I am a frequent visitor of Altronics as well... this would have to be one of the best electronics store I know.

    Regards

    Thomas

  5. #4
    25+ Posting Member
    Join Date
    May 2008
    Location
    Perth
    Posts
    40
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: B747-400 APU rotary switch

    APu Switch.jpg

    Hi Thomas,\Hope the pic helps.

    Regards
    Greg

  6. Thanks thomas747400 thanked for this post