you may be conflating the "Death Fork" found on many Viscount/Lambert with the ALAN, which is also made of alloy but AFAIK did not have a particular record of catastrophic failure.
YMMV
The "common knowledge" weak point ascribed to many ALAN frames is cracking of the headlugs, always good to make periodic checks of them, may as well extend your check to all other lugs, joints and tubes.