A dc8 or 707 took off out of South America. After the aircraft was washed they failed to remove the tape over the static system. After take off they noticed the problem. Instead of staying in slight of the lights of the city they went off into the dark. Lost all visual reference and ended up in the sea with a total loss of life.
Key word here. VISUAL.
Cheers.
Learn from the past. Prevent before it happens again