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The A-790 vernier control has a .078" dia. stainless steel wire core. Both the wire and Teflon™ lined flexible casing may be shortened as required. The Teflon liner provides low friction with heat resistance in high temperature areas such as engine compartments. Furnished with FAA-style knobs (Black, Red & Blue). Max. travel: 3-3/8". Stocked in the following lengths (measurement taken from under the panel nut to end of wire with knob pushed in).

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I’m still in the process of installing it however I just want to warn you to NOT Pull the knob out more than 3 1/ 8th inches otherwise a stainless steel ball about the size of a BB will fall out. Fortunately there is a link on how to reinstall the ball, assuming you can find it😀. You can also email the manufacturer, HCS products, and I’m sure they’ll send you a new ball. Here’s my suggestion for Aircraft Spruce, attach a note in bold letters for real men like me. Regards, John

John M
April 6, 2021


Please note, Aircraft Spruce'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 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.

Q: Are these A-790 controls FAA Approved?

Yes and no. Only the A-790-12 vernier mixture control is approved for Cessna 172, 172A thru Q; Cessna 150, 150A thru M, A150K, A150L, A150M; Cessna 152, A152. Other approvals pending. Order by Part Number and state Cessna model and serial number. A790-12 is 53" long.

Q: Re: A-790 VERNIER CONTROL. Will this control (p/n 05-08036) lock in place resisting pull of the Rotax 912 carburetor springs?

Yes. this will work on the Rotax.

Q: Can this A-790 cable be shortened, ie, cut to length in the field?

Yes, the A-790 control cable can be shortened as required.

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