The T-6A has its own self-sustaining oxygen system.  Known as the On-board Oxygen Generation System or OBOGGS, it is capable of providing pilots with automatically regulated oxygen up to an altitude of 31,000 ft under positive pressure.  The oxygen is obtained from the engine's left-side P3 port.  The oxygen is "extracted from conditioned air by pressure swing absorption through a molecular sieve." 

The only negative aspect of the OBOGS is its reliance on the engine.  If the engine dies, the OBOGS fails.  However, each pilot oxygen connector is fitted with an anti-suffocation valve.  In my opinion, I think it should be called a "suffocation" valve since it takes quite an effort to breathe without OBOGS. 

Some numbers you should know:

• From sea level to 15K', OBOGS provides 25-70% oxygen concentration

• From 15K' and up, OBOGS provides 45-95% oxygen concentration

• When the temperature in the ducting exceeds 200 deg C, an amber OBOGS TEMP light will appear on the CAWS

• Red OBOGS FAIL means that controller either detects a low concentration or the pressure in the system is low

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