 The NTSB Air Safety Investigator who wrote the CRM recommendation was aviation psychologist Alan Diehl.Assigned to investigate this accident, Diehl realized it was similar to several other major airline accidents including United Airlines Flight 2860, which occurred a little over a year before Flight 173 and under near identical circumstances; Eastern Air Lines Flight 401; and the Tenerife airport disaster.Diehl was familiar with the research being conducted at NASA’s Ames Research Center and believed these training concepts could reduce the likelihood of human error.