A CO detector has been installed in 3WF to alert you to the presence of carbon monoxide.
Upon turning on the Avionics Master (bus 2) switch you will briefly hear a new tone as the unit performs a quick self-test.
It alarms when CO levels measure greater than 50 parts-per-million (PPM).
A loud 85 dB aural warning will sound, and an amber warning LED will flash when CO measures 50 to 99 PPM over a 3-5 minute span.
An aural warning and a red LED flashing warning will trigger when levels climb above 99 PPM immediately when detected.
It is possible that the fumes of a jet in front of you in the runup area may trigger the alarm.
You can acknowledge and cancel an alarm sound by pressing the red button on the unit.