ACS Keyed Ignition Switch With Start Position A-510-2 FAA-PMA

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Part# 11-03170
MFR Model# A-510-2


These fine quality switches are used in many aircraft. The switch housing is now machined from billet aluminum which makes this switch 25% lighter. They provide “ON” and “OFF” electrical control of both magnetos on single engine aircraft. The Key-operated switches mount from the rear of the panel in a 7/8” dia hole. Available with or without starter position.

With Starter Position. Supplied w/switch plate two keys. (diode included) A-510-2

FAA PMA Approved.

Made in USA
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Good quality product

Michael G Verified Purchase


December 8, 2021


Brm A Verified Purchase


August 29, 2021

works great. looks good. screws a little short if you have more than one connector on connection such as ground.

Louis D Verified Purchase


August 24, 2021


West F Verified Purchase


July 21, 2021

Great product. the order was processed quickly

Richard M Verified Purchase


July 13, 2021

Fast delivery by Aircraft Spruce, works as advertised. Like the new faceplate that comes with the switch but I didnt need it as my panel is still in great shape.

Brian W
March 31, 2021

no comment

Philippe M
March 15, 2021

This order was satisfactory, not rescheduled like others.

Airborne I
December 3, 2020

Replaced my 15 year old switch. Exact replacement. Wiring diagram and diode included. Arrived quickly.

Tom R
September 23, 2020

delivered on time, Thanks !!

Burt R
September 5, 2020


Please note, Pilotshop'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. Pilotshop 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: Is it possible to get the connection diagram for the terminals on the back of the A510-2? I want to connect my Hobbs meter to it so Hobbs meter only runs when Master *and* ignition are both on. Is this possible with the A510-2?

Please see the Documents tab of this web page. There is a link to the "Installation Diagram". This will provide all available terminal connection information for this ACS keyed ignition switch.

Q: what is the AMP rating?

This switch (11-03170) is rated at 2 amps in a 12V system, or 1 amp in a 24V system.

Q: Does the jumper for terminal 1 come with the switch?

Yes, there is a jumper cable included with P/N# 11-03170 switch.

Q: What is the start function contact ratings? What is maximum voltage?

Momentary "on" function on "start" (spring-return to "both"). Current through "BAT" & "S" terminals is 2 amps inductive at 12 volts or 1 amp inductive at 24 volts. Current through "L" and "R" magneto grounding circuits is less than 0.5 amps. Open circuit voltage is 300 volts.

Q: What is the proper instrument panel cutout hole size required to install the ASC Keyed Ignition Switch A-510-2?

The O.D. of the threads are approx. 7/8", but you will want to have a notch in the hole so the switch does not rotate. The drawing is in the documents tab.

Q: What is the warranty on this ACS ignition A-510-2 switch?

1 year manufacturer's warranty.

Q: What are the overall dimensions of this switch?

This is 2.28" length and 2.23" at its widest point.

Q: What is the weight of the ignition switch A-510-2 on it's own?

Approx .209 lbs.

Q: When the switch is in the L position is the right Ignition disabled by providing a ground? I want to use this on a Rotax engine and the off signal is ground.

In the left position the right mag is grounded and in the right position the left mag is grounded.

Q: What size ring terminals fit the wiring connections?

You will need a stud size #6 for the ring terminal to be used on Part # 11-03170.