Re: B 737-500 Depressurization Incident

Date:         11 Mar 99 03:54:08 
From:         JF Mezei <>
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Puranjai Dass wrote:
> The cabin altitude
> warning (an intermittent horn) sounded at 10,000 cabin altitude and this
> was silenced by the F/O operating the horn cutout. He then armed the
> passenger oxygen switch. The aircraft cabin altitude continued to climb.
> Approaching a cabin altitude of 14,000 ft the Captain ordered manual
> deployment of the passenger oxygen masks.

Is it an urban myth that oxygen masks automatically deploy ?  How come they
required manual intervention to be deployed when just about every safety
briefing to pax mention "will automatically deploy in the unlikely event of a
de-pressurisation" ? ?

> Negative altitudes are not a
> reality of life, are they?

There are a few areas on earth where ground is significantly below sea level
(a few hundred feet).
There is an area in California USA like that.