ACS Keyed Ignition Switch A-510-5

Add to Wishlist
Part# 11-03169
MFR Model# A-510-5


These fine quality switches are being 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 broth 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.

Experimental aircraft only or 337 Form required for Production aircraft.

Without Starter Position., Supplied with switch plate & 2 keys. (diode not required) A-510-5.

Made in USA

Multiple ignition switches & lock sets are available with the same key. This is a special order and extra charges & lead times will apply. Please call sales for a price & lead time.
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


  • Frequently Purchased With
  • Customers Also Viewed
  • Related Items


Works as it should immediately after installation, the proof in the pudding can only be determined 5 years from now

Gladstone A Verified Purchase


September 28, 2023

A wiring diagram would have been nice. Some kind of assurance that it was getting installed correctly.

Aurora C Verified Purchase


February 25, 2022

Form fit and function are exactly what I was looking for on my 68 year old airplane.

Roy B
April 15, 2021

Great !! As order and on time

August 24, 2020

Nice switch. Works good. Love the keys and the fact that they are non-directional. However...this switch has lug-type connectors on the back, not threaded post type like on a Bendix. Little screws, tiny star lock-washers. If you have tight access for connecting P-leads and ground (like on my RV-4), trust me, you WILL say bad words when trying to get the leads connected with these tiny screws/washers. Threaded posts with nuts (like a Bendix) would be soooo much easier.

Randy C
December 11, 2021

This product is fine for certified aircraft as it is FAA PMA approved. However if you are building an experimental stay away from it. Replacement keys are very expensive IF you have a key with a number stamped on it. I originally got 4 keys for 4 locks and only one had a number on it. The locks do not have any number on them. If you don’t have the original number you have to ship a lock to ACS to get a key. Find something that does not go in a certified aircraft. Some locks that go in cabinets would work fine.

Robert J
November 5, 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: Is this switch rated for 25 volts or more?

Per the manufacturer: No, this ignition switch, part number 11-03169 is only rated for 14V systems.

Q: What kind and size of screws are used on the terminals? My switch did not come with any.

The screws are packaged in the same bag as the keys. Please check the bag, and if they are not there please contact our customer service department and they will ask the supplier to send them to you.

Q: When in the L position , R position or the Both position does that make the switch internal connection go to the ground terminal?

In the L position, the R terminal is ground and vice versa. Then the both position, neither are grounded.


No, this switch is not FAA PMA Approved.

Q: How many amps at 14v is the switch rated for?

2 amps inductive at 12 volts and 1 amp inductive at 24 volts.

Q: How can I get a replacement ignition key?

We can source cut keys from ACS, we would just need the number from your key or lock. Please contact our sales department with this information.

View in Catalog

View Image View in Catalog