Hello Bizjetdriver,
It has been a long time since I have seen the Jeppesen NDB approach chart used by Clipper 812. Clipper 812 turned too early because one ADF needle showed station passage while the other needle showed the aircraft North of the station. You can view the ILS-DME Arc Clipper 806 was using in the accident records on-line through ERAU. The very first time I saw these accident reports there was no such thing as the internet. The reason I remember these Pan Am accidents are for many reasons such as many accidents close together, Clipper 812, 816 final destination was San Francisco, CA. Pan Am's Pacific base of operations. Clipper 806 final destination was Los Angeles, CA., my hometown and also whereas the FAA's Western regional office in charge of watching Pan Am's Pacific operations. Pan Am was torched over these accidents because some of the Pilots were known to be airmen with questionable skills.