Product Details
- 1/4-20 Push rod threads
- 3/4-16 Panel bolt threads
- Knob is not included. Requires a knob with 1/4-20 threads.
Universal Vernier-Assist 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!
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 Controls
Available in a variety of standard lengths or custom fabricated to your unique requirements.
Installation Instructions:
- Control with threaded end
- Control with wire end
Control with 0.061″ diameter solid wire end
Order part number MCVA0241-03-LLL (LLL = length in inches)
- Knobis 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 end
Order part number MCVA1035-20-LLL (LLL = length in inches)
- Knobis 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 end
Order part number MCVA2035-20-LLL (LLL = length in inches)
- Knobis 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 1×7 twisted stainless steel wire end
Order part number MCVA3035-20-LLL (LLL = length in inches)
- Knobis 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 1×7 twisted stainless steel wire ends
Order part number MCVA0005-30DLLL (LLL = length in inches)
- Knobis 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!
Eligible Aircraft
| Make | Model | Start S/N | End S/N |
|---|---|---|---|
| Many | Many | 0 | ZZZZZZZZZZZZZZZ |
Product Documents
Frequently Asked Questions
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.
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.
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.
How do I trim my engine control to length?
Please reference the Installation Instructions included with your new control.
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.
