Accession Number:

ADP013848

Title:

G-Transition Induced Loss of Orientation and Reduced G Threshold

Descriptive Note:

Corporate Author:

DEFENCE AND CIVIL INST OF ENVIRONMENTALMEDICINE DOWNSVIEW (ONTARIO)

Personal Author(s):

Report Date:

2003-02-01

Pagination or Media Count:

8.0

Abstract:

It has been suggested that the psychophysical and physiological responses to the interplay of rotation and acceleration stresses may result in spatial disorientation SD 18, 4. The purpose of this presentation is to review past and current evidence on the possible relationship between disorientation and acceleration stress. Accident scenarios and a number of in-flight observations will be presented together with some theoretical postulates on the mechanisms involved. Our investigation suggests that execution of a series of rapid roll maneuvers prior to or following G transition may lead to loss of attitude awareness. This loss of attitude awareness can be attributed to perceptual confusion during roll maneuvers and the normal response of the vestibular apparatus to the rotary accelerative force acting on the semicircular canals. In addition, G threshold can also be significantly reduced immediately after prolonged rotation. This phenomenon is supported by past and current scientific evidence that the vestibular system exerts an influence on cardiovascular control. The next generation of high agility aircraft has enhanced maneuverability, which will expose pilots to a combination of translational and extraordinary angular accelerations. An understanding of the interaction between SD and acceleration stress is crucial to establish future research initiatives that will lead to appropriate countermeasures.

Subject Categories:

  • Psychology
  • Stress Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE