TY  - JOUR
PY  - 2016//
TI  - G-induced visual symptoms in a military helicopter pilot
JO  - Military medicine
A1  - McMahon, Terry W.
A1  - Newman, David G.
SP  - e1696
EP  - e1699
VL  - 181
IS  - 11
N2  - INTRODUCTION: Military helicopters are increasingly agile and capable of producing significant G forces experienced in the longitudinal (z) axis of the body in a head-to-foot direction (+Gz). Dehydration and fatigue can adversely affect a pilot's +Gz tolerance, leading to +Gz-induced symptomatology occurring at lower +Gz levels than expected. The potential for adverse consequences of +Gz exposure to affect flight safety in military helicopter operations needs to be recognized. This case report describes a helicopter pilot who experienced +Gz-induced visual impairment during low-level flight. CASE STUDY: The incident occurred during a tropical training exercise, with an ambient temperature of around 35°C (95°F). As a result of the operational tempo and the environmental conditions, aircrew were generally fatigued and dehydrated. During a low-level steep turn, a Blackhawk pilot experienced significant visual deterioration. The +Gz level was estimated at +2.5 Gz. After completing the turn, the pilot's vision returned to normal, and the flight concluded without further incident. <br><br>DISCUSSION: This case highlights the potential dangers of +Gz exposure in tactical helicopters. Although the +Gz level was moderate, the pilot's +Gz tolerance was reduced by the combined effects of dehydration and fatigue. The dangers of such +Gz-induced visual impairment during low-level flight are clear. More awareness of +Gz physiology and +Gz tolerance-reducing factors in helicopter operations is needed.<br><br>Reprint & Copyright © 2016 Association of Military Surgeons of the U.S.<p />  <p>Language: en</p>
LA  - en
SN  - 0026-4075
UR  - http://dx.doi.org/10.7205/MILMED-D-16-00073
ID  - ref1
ER  -