Definition
Removable panels or covers placed over an airplane's windshield and cabin windows during ground storage to block sunlight, reduce interior heat buildup, and protect the instrument panel, upholstery, and plastic trim from ultraviolet damage and fading.
Plain English
Covers you put over the airplane's windows when it's parked so the sun doesn't bake the inside or fade the panel and seats.
Context Anchor
Seen during post-flight securing, when the pilot is leaving the airplane parked after a flight.
Derivation
“Screen” comes from an older word meaning a shield or protective barrier. In this term, a sunscreen is not lotion for skin; it is a screen that shields the airplane’s windows from the sun.
Why Pilots Care
Prevents UV damage to interior surfaces and keeps the cabin temperature from becoming dangerously high before the next flight.
Analogy
Like the fold-up reflective shades drivers place behind a car windshield on a hot day.
Intuition Check
Do not read “sunscreen” here as skin lotion. In this aircraft context, window sunscreens are physical covers or shades used on the windows.
Example Sentence 1
After tying down the airplane, the pilot fitted the window sunscreens before walking away from the ramp.
Example Sentence 2
The window sunscreens kept the instrument panel from getting too hot while the plane sat on the ramp in full sun.