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Home / Airframe Parts / McFarlane Aviation Products / Propeller Controls /  /McFarlane Control Vernier-Assist 6' - MCVA3035-20-072
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McFarlane Control Vernier-Assist 6' - MCVA3035-20-072

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Part# 05-15859
MFR Model# MCVA3035-20-072

Overview

  • Throttle control with 5/64" diameter 1x7 twisted stainless steel wire end.
  • P/N 6515
    barrel stop assembly is included.
  • Knob is not included. Requires a knob with 1/4-20 threads.


Universal Vernier-Assist ControlsMcFarlane invents a new type of vernier engine control
This new type of control has all the fine adjustment benefits of an old-style push-button release vernier control, with the simplicity, responsiveness and jam-proof safety of a friction lock control.
McFarlane’s patented Vernier-Assist™ offers the pilot precision control of the engine, unlike anything else on the market! The Vernier-Assist assembly operates on friction alone by simply turning the knob, with no threads or locking balls/pins. It also allows for normal coarse movement by pushing in or out on the knob. Unlike standard threaded vernier controls, this design cannot be jammed. The friction control provides smoothness and precision when operating the throttle and a friction lock secures the control in position, but it can be easily overridden in the case of an emergency. It is SAFE!
You asked for it and now we have it. Not only do we offer Vernier-Assist for non-certified aircraft and an extended line of FAA-PMA approved controls, the breakthrough design is now approved on throttle controls for Cessna, Piper, Beechcraft, Grumman, and Bellanca.
  • Jam-proof safety
  • Precision power adjustments
  • Smooth friction control
  • Light and compact
  • Standard Vernier performance without the button!


These light weight controls use a patented roller action and do not use a positive lock thread engagement. Coarse adjustments are made by pushing the knob inwards or pulling the knob outwards. Fine adjustments are made by rotating the knob clockwise or counterclockwise. For extreme conduit routing or heavy carburetor load installation, slight inward or outward assist pressure could be required during rotation.
US Patent No. 8,485,057 B1 
MCVA Series ControlsAvailable in a variety of standard lengths or custom fabricated to your unique requirements.
Installation Instructions:
Control with 0.061" diameter solid wire endOrder part number MCVA0241-03-LLL (LLL = length in inches)
  • Knob is not included. Requires a knob with 1/4-20 thread. 
  • Available in 4, 6 and 10 foot lengths
  • May be trimmed to length
  • Requires a 3/8" panel hole
  • Ideal for aircraft with tight space constraints! Extends about 3.5 inches behind the dash
Control with 10-32 threaded endOrder part number MCVA1035-20-LLL (LLL = length in inches)
  • Knob is not included. Requires a knob with 1/4-20 thread. 
  • Available in 3, 4, 5, 6, 7 and 8 foot lengths
  • Vernier and friction lock
  • Requires a 3/4" panel hole
Control with 1/4-28 threaded endOrder part number MCVA2035-20-LLL (LLL = length in inches)
  • Knob is not included. Requires a knob with 1/4-20 thread. 
  • Available in 3, 4, 5, 6, 7 and 8 foot lengths
  • Vernier and friction lock
  • Requires a 3/4" panel hole
Control with 5/64" diameter 1x7 twisted stainless steel wire endOrder part number MCVA3035-20-LLL (LLL = length in inches)
  • Knob is not included. Requires a knob with 1/4-20 thread. 
  • Available in 4, 6, 8 and 12 foot lengths
  • Vernier and friction lock
  • Includes 6515 Barrel Stop Assembly
  • Requires a 3/4" panel hole
Dual Control with 1/16" diameter 1x7 twisted stainless steel wire endsOrder part number MCVA0005-30DLLL (LLL = length in inches)
  • Knob is not included. Requires a knob with 1/4-20 thread. 
  • Available in 4, 6, 8 and 12 foot lengths
  • Vernier and friction lock
  • Includes 6408 Hardware Kit
  • Perfect for Rotax 912/914 engines!

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Please note, Aircraft Spruce Canada's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce Canada assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.