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Positive G will cause the blood to the brain to:
  • A
    first increase, then decrease
  • B
    decrease
  • C
    increase
  • D
    remain constant

Radial Accelerations +Gz.

Radial accelerations are caused by rotation about a distant axis. They act outwards from the centre of rotation and are experienced whenever an aircraft changes direction (predominantly +Gz). This type of acceleration is the most significant to pilots. During radial accelerations, fluid and tissues are displaced downwards.

A pressure gradient develops in the blood between the heart and the brain, resulting in reduced blood pressure at head level. This can reduce the supply of oxygen to the eye and brain, ultimately leading to G-Induced Loss of Consciousness (G-LOC). The blood pressure in the blood vessels of the lower parts of the body rises with increasing G, and flow of blood back to the heart is reduced. The high blood pressure in parts of the body below heart level can be sufficient to rupture small capillaries in the feet and forearms.

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