Primarily for general aviation discussion, but other aviation topics are also welcome.
I bought a simple Fire Angel from a hardware store, stuck some Velcro on the back and it now sits on the control tunnel carpet in front of the trim wheel in the C120. Its loud enough to hear in cruise with a headset on, its yet to go off in the aircraft, which I hope it never does.
kanga liked this
riverrock wrote:For ref:
35ppm The maximum allowable concentration for continuous exposure for healthy adults in any 8 hour period, as recommended by the
Occupational Safety and Health Administration (OSHA).
200ppm Slight headache, fatigue, dizziness, nausea after 2 - 3 hours.
400ppm Frontal headaches within 1 - 2 hours, life threatening after 3 hours.
800ppm Dizziness, nausea and convulsions within 45 minutes. Unconsciousness within 2
hours. Death within 2 - 3 hours.

Regarding the above table, presume that is for breathing at typical sea level pressures (may even use ISA). As the oxygen partial pressure reduces with altitude, I suggest the above safe limits will reduce. Frank?