TM 1-1680-361-10
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THEORY OF OPERATION WORK PACKAGE –
Continued
0003 00
SRU-36/P HEED
Inhaling creates a negative pressure within the demand chamber
which pulls the diaphragm down. The diaphragm depresses the
poppet lever, forcing the poppet valve into the open position. This
permits cylinder air to flow through the regulator assembly to the
mouthpiece. When inhalation ceases, the diaphragm returns to its
static position. The poppet lever also returns to its static position, the
poppet valve closes, and air flow from the cylinder ceases. Exhaled
air flows through the mouthpiece into the demand chamber and out
the main body exhaust ports in the bottom of the regulator. When
exhaled air pressure ceases, the flexible exhaust disc seats to prevent
water entry. The SRU-36/P will continue to function until air pressure
in the cylinder is depleted.
SRT
The tether is intended to provide the aircrew member with a safety
“backup” attachment while being extracted externally on
thefollowing aircraft with limited internal space: AH-64A, AH-1F,
and OH-58D(I).
