Airbus A320 Cockpit Tour: #29 - Signs Panel: What do all those buttons do?!

Follow me on IG@ MikeAbignale Visit my store: https://teespring.com/stores/mikes-sh... *Sorry guys, I didn't mean to say "since the begining of time" regarding the no smoking signs. Smoking on planes was considered normal up through the early 80s I think. Crazy concept to me...but thankfully they changed this policy* In this segent we will discuss the Signs section of the Airbus A320 Overhead. (1) EMER EXIT LT sw The EMER EXIT LT sw can have one of the following configuration: or ON : Overhead emergency lights, EXIT signs and proximity marking system come on. OFF : Above lights are off. ARM : ‐ The proximity emergency escape path marking system comes on when the normal aircraft electrical power or DC SHED ESS BUS is lost ‐ The overhead emergency lights come on if: • Normal aircraft electrical power system fails or • DC SHED ESS BUS fails or • AC BUS 1 fails. ‐ Exit signs come on if: • Normal aircraft electrical power system fails or • DC SHED ESS BUS fails or Note: The LIGHT EMER pb on the Purser's panel can turn on the emergency lighting regardless of the position of the EMER EXIT LT sw. (2) EMER EXIT LT-OFF lt OFF : The amber The emergency lighting system consists of the following: ‐ Proximity emergency escape path marking systems (escape path and exit markers) ‐ Overhead emergency lights ‐ EXIT signs ‐ Lavatory auxiliary lights ‐ Overwing escape route  lighting ‐ Escape slide lighting. The floor proximity emergency escape path marking is a self-luminescent system. When in operation: ‐ The exit markers of the proximity emergency escape path marking system are powered by internal batteries for at least 12 min. ‐ The DC SHED ESS BUS supplies the cabin emergency lighting. ‐ If DC SHED ESS BUS fails, batteries inside the light provides power to cabin emergency lighting. ‐ In nominal case, the DC SHED ESS BUS charges these internal batteries if: • The EMER LT sw is not at ON • The EMER pb on the Purser’s panel is not pressed • The DC BUS 1 is supplied • Depending on the CIDS/CAM programming, when: ▪ The NO SMOKING sw  , or ▪ The NO PORTABLE ELEC DEVICE sw  , or ▪ The EXIT sw  is set to OFF or AUTO when the landing gear is retracted. Lavatory auxiliary lights are always on. They are supplied by 28 V DC ESS BUS. The escape slides have an integral lighting system. The escape slide lights and overwing escape route  lights come on automatically, when the slide is armed and the door or emergency exit is open. They are supplied by internal batteries.