Definition
The interior cockpit lighting used to illuminate instruments, controls, and panels. In thunderstorm or night-flying contexts, these lights are turned up to full brightness so that sudden lightning flashes outside the aircraft do not temporarily blind the pilot.
Plain English
The lights inside the cockpit that let you see your instruments and switches. Turning them up bright before flying through a thunderstorm helps protect your eyes from being dazzled by lightning.
Context Anchor
Seen in procedures for night flying and for inadvertent thunderstorm encounters, where bright interior lighting can help reduce the blinding effect of lightning flashes.
Derivation
“Flight deck” comes from the idea of a deck as a working platform or operating area, first common in ships and later used for the pilot’s operating area in an aircraft. In this term, it means the place where the aircraft is controlled, not an outside deck.
Why Pilots Care
Setting flight deck lights to full bright before thunderstorm entry prevents temporary blindness from lightning flashes.
Analogy
It is like turning on a room light before a camera flash goes off; the flash is still bright, but it is less startling because your eyes are not fully adjusted to darkness.
Intuition Check
Do not confuse flight deck lights with the airplane’s outside lights. Flight deck lights are inside the cockpit; landing lights, position lights, and anti-collision lights are outside the aircraft.
Example Sentence 1
Before entering the area of weather, the captain turned the flight deck lights to full bright to reduce the risk of being blinded by lightning.
Example Sentence 2
Dimming the flight deck lights preserved night vision during the instrument approach.