4. Provide the pilot with a physical indication
of the approximate acceleration to which the air-
craft is being subjected
Typical Anti-G System
Most anti-g systems are similar to the one
illustrated in figure 1-2. This system consists of
a supply line, an air filter, a pressure regulating
valve, a connecting hose, and a suit attachment
fitting (single quick disconnect or composite quick
disconnect). The air pressure used in this system
may be taken directly from the engine compressor
bleed-air ducting, but is usually taken off the
air-conditioning ducting downstream from the
heat exchanger.
Pressure Regulating (Anti-G) Valves
There are two types of anti-g valves used on
the various naval aircraft. One type has a dual
pressure range (HI or LO) that maybe controlled
by the pilot. The other type has a fixed pressure
output that corresponds roughly to the high (HI)
pressure output of the dual pressure valve. Both
valves perform the dual functions of regulating
the air pressure received from the aircraft’s bleed-
air system and metering this pressure in varying
amounts proportional to the g forces exerted upon
the aircraft and its occupants.
Newer aircraft are designed with an anti-g
system that has a single-stage pressure regulating
valve (fig. 1-3). This valve begins to open at
approximately 1.5 g’s, and pressure is supplied
to the suit at the rate of 1.5 psi for each additional
g. The valve is designed to receive air pressure
from the bleed-air system at varying pressures and
to meter a maximum of 10 psi to the anti-g suit.
A relief valve bleeds off the excess air pressure
Figure 1-3.—Anti-g pressure regulating valve (single
stage)
Figure 1-2.—Anti-g system.
1-3
