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Sure enough, in less than a minute, I was able to find this In the "desription and use of operators controls and indicators" chapter(on the first page. 18. Audible Alarm. A steady tone sounds when air pressure is below 65 psi (448 kPa). A wavering (dual tone) sounds when troop transport alarm...

I wonder what it's called in the -10. Often correct terminology is helpful when diagnosing problems.