From the Flight Deck with Captain Doug: A zoom with a view
Dec 01, 2019

If you're a frequent flyer, you've probably wondered about the windows from which you peer out during your flight.

Passenger windows feature two acrylic panes built to withstand the significant differences between the cabin pressure and the pressure outside.

A third plastic pane is fitted with a sliding window blind, though aircraft like the  B787 Dreamliner are outfitted with an adjustable dimming window that makes the third pane unnecessary.

And have you ever noticed that very small hole  at the bottom centre of the inner pane? It's called a 'bleed hole ' and it allows cabin air to equalize pressure and temperature between the two panes.