McFarlane Aviation Products FAA-PMA Replacement Aircraft Parts

MC6160 Push-to-Unlock Controls - Square Knob

Ideal for carburetor heat or alternate air control 



  • Perfect for homebuilt or custom projects
  • Quality stainless steel construction
  • High temperature Teflon lined conduit for smooth, consistent control 
    • Cheapy controls with poly liners will not tolerate engine temperatures
  • Available in 6, 8 and 12 foot lengths
    • May be trimmed to length
  • Anodized aluminum square knobs 
    • Meets FAA Regulation 23.781 for cockpit control knob shape for carburetor heat and alternate air
    • Available with black knob and black or clear (silver) anodized aluminum push-button


For ordering information, go to MC6160 Controls.




  • Conduit:  0.24 inch OD Teflon lined wound conduit 
  • Inner wire:  0.071 inch diameter music wire
  • Travel (stroke):  3 inch maximum
  • Maximum work loads:  25 lbs (Pull), ~10 lbs* (Push)
  • Minimum locking force:  15 lbs
  • Operating temp:  -65 to 450 deg F **

* Max push load dependent on wire size, length of trimmed wire (unsupported by conduit), geometry of wire rigging, and configuration of actuator

** Operating temperature of knob/guide tube assembly: -65 to 250 deg F 



Custom Engraved Knobs:

Custom laser marking of the knobs is available for $25.00 per knob. Receive a $15.00 discount for each additional knob with the same design. Please call Randy at 866-920-2741 ext. 289, or email him at for details.


Engraving Request Form




These controls are not for use on certified aircraft, or for use for flight controls or flight control trim tabs.

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