Let's put that one next to the CABIN ALTITUDE and TAKEOFF CONFIG
lights. Those came from crashes where the warning horn was dual purpose: improper takeoff configuration or cabin pressure corresponding to an altitude over 10000 feet.<p>In the Helios 522 crash, the crew departed with an incorrect cabin pressure controller setting. When the horn went off, they were thinking, "Why are we getting the takeoff config warning? There must be a bad switch somewhere..."<p>Modern planes shouldn't just beep or do ambiguous complaining. People must die before planes like the 737 are modded to give proper annunciations.