I don't know about influential crashes, but the Thai Airways International A310 crash at Kathmandu on July 31, 1992 remains a classic example of dismal airmanship. Despite ground based navigation aids at the airport and VOR and ADF receivers in the aircraft, the crew apparently disregarded these in preference to giving priority to punching computer keys in their CDU's and meanwhile losing situational awareness in IMC. The crew's use of the FMS for navigation was uncoordinated and may have led to confusing system outputs. Notwithstanding, what should have been a straight forward missed approach turned into tragedy when the crew allowed the aircraft to wander in circles until hitting a mountain at 11,500 ft elevation in an area with MSA of 21,000 ft. The accident was well described in a book (published in October 1993) called Air Disaster Volume Three. The Australian author was MaCarthur Job