NigelOn Draft-
With your comment about the early GPWS systems, I thought you'd enjoy this story.
Early on when we first got the GPWS, it was sounding off (falsely) on many flights. The crews just kept flipping the switch to the "Off" position to keep it silent. Then management put a guard on the switch and safety wired it "On".
Probably the funniest MX log writeup I've ever seen read, "GPWS safety wire failed in flight".
