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  • Mark
    Mark replied to the topic B737-300 Grid No in Electrical and Wiring
    Editing
    Topic-icon B737-300 Grid No
    I've never really used "grid" from chapter 91.

    I looked at my copies of the 737-300/400 and 767-200 chapter 91, "grid" is not mentioned at all.
    I'm assuming grid location would be Vertical (letters) and Horizontal (numbers) of each breaker on a particular panel.

    From your sheet and one I dug out of a 767 manual.
      
      
     
      
      
     
      


    Each breaker has a specific location on each panel. Maintenance Manuals usually call for breakers to be pulled before a task is started. Breaker location is usually mentioned by Panel, Row, and Number.

    The pilot's "Red Tab Book" (Emergency Procedures Book) will mention breaker location in the same way.
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  • dynamics
    dynamics created a new forum post in Electrical and Wiring
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    Topic-icon B737-300 Grid No
    for b737-300 some grid locations (Grid No) are associated with Circuit Breaker No.
    what does the Grid No mean and how is it used?
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    dynamics just registered on the site
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  • Mark
    Mark replied to the topic Thermocouples in Troubleshooting Tips
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    Topic-icon Thermocouples
    When replacing thermocouple wiring, how do you know what color (green or white) is what material? 
      
      
     
      
      
    Chromel (green) is magnetic. It should be attracted to a magnet.

    We found the opposite for the pins. Alumel pins seemed to have a greater pull to a magnet.
     
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