Mar 10 2025
Boeing 737 classic aircraft use cockpit panels which are backlighted by incandescent bulbs. They are driven by 5V (not 28V like all other bulbs, so please don’t burn them, it happened to me). The bulbs are connected in parallel, they are directly soldered onto a PCB and fit through holes into the semi-transparent backplate. Unfortunately, …
Mar 08 2025
Korry annunciators are used in many larger aircraft. Boeing often uses (or: used, e.g. in the Boeing 737 classic series) the Korry 318 annunciator. It consists of two 28V white light bulbs (Type 387 T1 3/4 Midget Flanged). The annunciator can be pressed, activating a switch to test the annunciator’s light bulbs. The light bulbs …