Results 1 to 8 of 8
  1. #1
    75+ Posting Member


    peterkwu's Avatar
    Join Date
    Mar 2008
    Location
    Washington, DC
    Posts
    76
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Wiring diagram for real B737 landing gear selector lever

    I apologize if this has been discussed before. I couldn't find it by searching.

    I manged to get a real B737 landing gear lever, complete with solenoid and switches. Does anyone have a wiring diagram for this beast?

    There are two wires coming from the solenoid, which is marked 28v, hard to tell if it's 5A or .5A. There seemed to be a diode between the two leads coming off the solenoid.

    Any advice would be appreciated.

    Peterphoto(2).jpgphoto.jpg
    Last edited by peterkwu; 01-19-2010 at 07:00 PM. Reason: Changing incorrect title

  2. #2
    500+ This must be a daytime job 737NUT's Avatar
    Join Date
    Feb 2006
    Location
    Indianapolis, IN
    Posts
    778
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Wiring diagram for real B737 throttle lever

    It is .5 amp. The diode is standard on solenoids and is used as a voltage clamp to protect the circuit when the solenoids releases. Usually, +28Vdc goes to the connection where the Anode or (line painted on diode) is facing. Hope that helps.

  3. #3
    150+ Forum Groupie verticallimit's Avatar
    Join Date
    Apr 2009
    Location
    Denmark, Sinding
    Posts
    230
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Wiring diagram for real B737 throttle lever

    You can easily remove the diode and then try to put a separate 24 V dc voltage on the coil. The diode blocks trancients that occur when power is turned off from the coil.
    I recommend that you mounting the diode again, and better two diodes, since trancients can destroy electronics.
    Put an ampere meter in series with the coil and read your power (0.5 or 5 amp).
    If you have an ohmmeter you can measure the resistance. 5.6 ohms is 5 amp / 56 ohms is 0.5 amp

    Sincerely,

    Claus


  4. #4
    500+ This must be a daytime job 737NUT's Avatar
    Join Date
    Feb 2006
    Location
    Indianapolis, IN
    Posts
    778
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Wiring diagram for real B737 throttle lever

    I've had 2 of these. Its a .5 amp. I activated it with a phidget I/O card. The micro switch is seperate from the solenoid so no need to go overboard on protection.

  5. #5
    Executive Assistant Geremy Britton's Avatar
    Join Date
    Jul 2007
    Location
    North,East England
    Posts
    1,597
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Wiring diagram for real B737 throttle lever

    Title says wiring diagram for the throttle lever and in the post you're talking about the landing gear lever. Sure it's just a mistake, but you don't want to get clearence pushing full thrust and you realise you're retracting the gear
    Geremy Britton
    Executive Assistant, MyCockpit Inc
    Head of GLB Flight Products
    www.geremy.co.uk

  6. #6
    75+ Posting Member


    peterkwu's Avatar
    Join Date
    Mar 2008
    Location
    Washington, DC
    Posts
    76
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Wiring diagram for real B737 throttle lever

    Thanks, corrected it. I'm working on a TQ at the same time, hence the throttle on my brain.

  7. #7
    75+ Posting Member


    peterkwu's Avatar
    Join Date
    Mar 2008
    Location
    Washington, DC
    Posts
    76
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Wiring diagram for real B737 throttle lever

    Thanks, it does turn out to be 0.5 A. I activated it successfully today with a 28v 1.8A rated power supply.

    I managed to destroy the diode while trying to identify it. There was some sort of super thick, hardened heat shrink on the diode. What would be appropriate diodes to put in this circuit?

  8. #8
    75+ Posting Member


    peterkwu's Avatar
    Join Date
    Mar 2008
    Location
    Washington, DC
    Posts
    76
    Contribute If you enjoy reading the
    content here, click the below
    image to support MyCockpit site.
    Click Here To Contribute To Our Site

    Re: Wiring diagram for real B737 throttle lever

    The only other thing I've found to put on this dedicated 28V power supply are some Cole starter switches. The diodes are easy enough to add so I probably will put them back on.

Similar Threads

  1. B737 Gear lever
    By Westozy in forum Westozy's Mechanical Engineering
    Replies: 25
    Last Post: 02-09-2012, 02:59 AM
  2. B737 NG Gear lever
    By archen in forum General Builder Questions All Aircraft Types
    Replies: 4
    Last Post: 01-25-2011, 07:00 AM
  3. For Sale B737 Real Cockpit Sections (more than 1)
    By blueskydriver in forum Off Site Articles For Sale
    Replies: 8
    Last Post: 03-20-2010, 07:03 AM
  4. Is it a throttle, power lever or thrust lever?
    By fweinrebe in forum Pilots Lounge - Let your Hair down
    Replies: 2
    Last Post: 03-21-2009, 10:50 AM
  5. thrust lever position in B737
    By michelmvd in forum PM General Q & A
    Replies: 6
    Last Post: 08-12-2008, 10:54 AM