McFarlane Aviation Products FAA-PMA Replacement Aircraft Parts

Vernier-Assist Throttle Controls

Vernier-Assist Throttle Controls

McFarlane 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!
Assembly Video

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

MCTV Throttle Series:
Vernier and friction lock - The best of both!

The new Vernier-Assist^TM throttle control is adjustable for friction and vernier engagement and is available with three different end configurations. Requires a 3/4" panel hole. Available in a variety of standard lengths or can be custom fabricated to your unique requirements.

Control Specifications

Installation Instructions:

Throttle Control with 10-32 threaded end:
Order part number MCTV1035-LLL (knob included) or MCVA1035-20-LLL (without knob).

LLL is the length in inches
Choose control length 036, 048, 060, 072, 084, 096

Throttle Control with 1/4-28 threaded end:
Order part number MCTV2035-LLL (knob included) or MCVA2035-20-LLL (without knob).

LLL is the length in inches
Choose control length 036, 048, 060, 072, 084, 096

Throttle Control with 5/64" dia 1x7 twisted stainless steel wire end:
Order part number MCTV3035-LLL (knob included) or MCVA3035-20-LLL (without knob).

LLL is the length in inches
Choose control length 048, 072, 096, 144

Dual Throttle Control with 1/16" dia 1x7 twisted stainless steel wire ends:
Order part number MCTV0005DLLL (knob included) or MCVA0005-30DLLL (without knob).

LLL is the length in inches
Choose control length 048, 072, 096, 144

Less Detail

Question
How do I clean and sanitize a McFarlane Push-Pull Control? We make the following cleaning and sanitizing recommendations to be completed between flights: Recommended Cleaning Process 1. Put on clean disposable gloves prior to cleaning and disinfection. 2. Pull controls back to the fully retracted position to expose the full length of the control shafts. 3. Apply isopropyl alcohol to a clean microfiber towel. Do not spray any solution directly on the controls or any other surfaces or components in the aircraft. !!! WARNING: DO NOT USE BLEACH WIPES ON ANY MCFARLANE CONTROL !!! 4. Gently and thoroughly wipe down every control knob surface and control shaft. 5. Let cleaning solution dry on these surfaces (contact time). 6. Use a clean and dry microfiber cloth to wipe away any solution residue left on knob and control shaft surface. 7. Remove all gloves, towels, and cleaning supplies from the work area in the aircraft. Please contact McFarlane Sales directly at 866-920-2741 or 785-594-2741 or sales@mcfarlaneaviation.com if you have any additional questions regarding the disinfection of our controls.
I purchased a laser engraved knob and the thickness of the marking is very shallow. What kind of wear resistance can I expect? The laser marking does not harm the hard durable anodize coating on the aluminum knob. The CO2 laser process only bleaches the color from the anodizing leaving a silver white color that contrasts with the surrounding dyed anodize. The durability of the laser marked area is not affected by the laser. Our tests have shown that the laser process actually improves the corrosion resistance of the anodize layer. The CO2 laser engraves aluminum knobs by vaporizing the surface leaving a deep durable groove. This groove is then filled with a special paint for contrast. The result is a durable long lasting mark.
My Vernier-Assist Throttle control came apart during installation or maintenance. Can it be put back together? Yes, this is common and can put back together, provided no components are missing. Please watch the Vernier-Assist Assembly Video for details.
What is the minimum bend radius for my engine control? McFarlane's Storage and Packaging Specification requires a specific packaging minimum radius based on the length of the control, type of wire used, and the configuration of the control end(s). Please contact us to determine the exact requirements for your specific control.
Why is my new engine control too long/short? There are several things that could be different such as engine/aircraft modifications, rigging/clocking of control arm or adjustment of rod end will be needed, placement of clamps or brackets may be different, or a previous installation change such as routing from original.

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