Gear Guide · Safety · 2026
GearSafetyStudent Pilot
5 min read
Aviation CO Detectors — A Safety Item Every Aircraft Should Have
Carbon monoxide from a cracked exhaust manifold is odorless and colorless. It can incapacitate a pilot before they realize anything is wrong. Here's how to protect yourself.
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Why carbon monoxide is an aviation safety priority
Carbon monoxide (CO) is an odorless, colorless, tasteless gas produced by incomplete combustion. In aircraft, it typically enters the cabin through cracks in the exhaust manifold or heat exchanger — the same components that supply cabin heat. Because you cannot detect CO by smell or sight, many pilots are exposed without realizing it until symptoms develop.
CO poisoning causes: headache, dizziness, nausea, confusion, and loss of coordination — all of which severely impair the ability to fly safely. Critically, mild CO poisoning feels remarkably similar to fatigue. Pilots sometimes attribute early symptoms to a long day rather than recognizing them as a serious cockpit emergency.
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If you suspect CO: Immediately turn off cabin heat, open fresh air vents, descend if possible, and land at the nearest suitable airport. Declare an emergency if you feel impaired. Do not continue the flight.
Our pick — CO Guardian Portable CO Detector
Why it works
- Designed specifically for aviation — calibrated to alert at aviation-appropriate CO thresholds
- Audible and visual alarm — hear it over cockpit noise
- Portable — moves between aircraft easily
- No installation required — plugs into cigarette lighter or USB port
- Trusted by flight schools — available at Sporty's Pilot Shop
- Calibrated specifically for cockpit use in general aviation aircraft
- Continuous monitoring with dedicated audible and visual alarm
- Long sensor life with replaceable sensors
Limitations
- More expensive than home CO detectors
- Sensor requires eventual replacement
Budget option — Forensics Detectors CO Detector
Pros
- Fast 9 ppm alarm threshold — designed specifically for vehicle/aircraft use
- Displays actual CO ppm level continuously — not just a simple alarm
- Metal body — durable and heat-resistant in a cockpit environment
- Ultra-compact at 2 oz — fits in a shirt pocket
- Purpose-marketed for pilots, police, bus drivers — aviation-appropriate design
- Significantly less expensive than aviation-specific brands
Cons
- Not aviation-specific — alarm thresholds set for home use (may alarm later than desired)
- Audible alarm may be harder to hear over cockpit noise
- No cockpit mount — must be positioned where you can see or hear it
What about the CO spot indicators?
Some pilots use cardboard CO spot indicators that change color when CO is present. These are passive, require you to actively look at them during flight, and have varying reliability. They're better than nothing but far inferior to an electronic detector with an audible alarm. For the price of a tank of avgas, an electronic detector is the obvious choice.
When to suspect CO in flight
- Unexplained headache that develops during flight, especially during descent with cabin heat on
- Dizziness, nausea, or confusion that seems to come on gradually
- Symptoms that improve when you open fresh air vents or turn off cabin heat
- All occupants feeling similar symptoms simultaneously
- Your CO detector alarming — treat it as real until proven otherwise
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