Guardian Avionics Aero 353 CO Detector For Experimental / Homebuilt

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The AERO 353 has a built-in state-of-the art CO sensor that immediately reacts to the presence of CO. It was designed for pilots who want the unit to be small, so it takes up a minimum of panel space, and provides pilots a peace of mind.

Detector will go into alarm mode within five minutes if CO level is greater than 50 PPM.

The unit has dual light LED alarm; Amber less than 99 PPM and Red 100 PPM and above.
Very simple installation (2-4 hours).
California Prop 65 Warning Symbol

WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm.


  • Designed for non-certified single and multi-engine piston engine aircraft.
  • Dimensions: 3.35 in. L x 2.25 in. W x 1.50 in. H.
  • Weight 3.5 oz.
  • Input Power 14/28 VDC.
  • Internal fan for optimum sensing.
  • Shielded to prevent EMI (Electro-Magnetic Interference) with aircraft systems.
  • Audible alarm with varying pitch at 85 dB.
  • LED Red and Amber CO Alert lights. LED Green nominal indication light.
  • Temperature ranges 0 F to 110 F.
  • Built-in Temperature compensating circuit.


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Great product except the thread for the supplied mounting screws (in the unit body) was badly over sized, actually to the point that the supplied screws would not tighten. Put the next size screw in after taping out and that fixed the problem, but you then have 2 screw heads that are bigger than the rest of the pannel but no biggy can live with that

Rory H
March 1, 2018


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: What does the sensor of the CO guardian Aero 353 CO detector do?

The sensor detects the presence of CO and the detector will go into alarm mode within five minutes if CO level is greater than 50 PPM.

Q: What is the function of the pressure sensor?

The pressure switch which is the 353P version is for pressurized aircraft. The 353 is for non pressurized aircraft.

Q: When the unit is on and no CO is being detected (Almost all of the time) are there any lights on? Please confirm that the product remains dark unless it is in an alarm mode. And that the green LED light is only illuminated when the test button is pressed and the unit tests serviceable.

The green light will always remain on showing the unit is working. In case of a carbon monoxide alert, the pilot will receive an amber alert annunciator light.

Q: Does the CO Guardian Aero 353 CO Detector fit a standard Hobbs hole dimensions?

We have added a drawing to the dimensions tab for the CO Guardian Aero 353. Please see the dimensions tab for specific mounting details.

Q: Im confused. The specifications include Audible alarm with varying pitch at 85DB but a question about this is the Q+A has an answer that states this unit does not have an audible alarm Which is it?

According to the manufacturer this unit has an audible alarm that will bleep until you press the test/reset button. Once this is done the sound will be muted but the light will remain on.

Q: Does this device require installation by an A&P to be legal or can this be installed by the owner?

As this is for experimental aircaraft only, this unit can be installed be the owner of the aircraft.

Q: I have limited panel room and do not have a wide enough space for the horizontal oriented unit as available. Can this be ordered with the mounting face in a vertical orientation?

Dimensions: 3.35 in. L x 2.25 in. W x 1.50 in. H. This is designed to be mounted horizontal.

Q: Is the amber light included? what type of electrical connector is supplied?

Yes, this is a dual led alarm. The alarm indicator lights up amber, then red.This comes with a 9-pin solder type connector.

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