During a night-time helicopter transfer, the HEMS crew must avoid using certain light sources inside the aircraft. What colour light should be used in...

Question

During a night-time helicopter transfer, the HEMS crew must avoid using certain light sources inside the aircraft. What colour light should be used in the cabin to preserve the pilot's night vision?

Accepted Answer

Red light - it preserves scotopic (rod) vision adaptation while allowing the crew to work

Answer

White light at full brightness

Answer

No light should be used at all during night flights

Answer

Green light - it provides the best contrast in darkness

Answer

Blue light - it has no effect on pupil adaptation

uk-dipimc MCQ (SBA): Night Vision and HEMS Operations

During a night-time helicopter transfer, the HEMS crew must avoid using certain light sources inside the aircraft. What colour light should be used in the cabin to preserve the pilot's night vision?