Date: June 2, 1990 Type: Boeing 737-2X6C Registration: N670MA Operator: MarkAir, Inc. Where: Unalakleet, Alaska Report No. NTSB/AAR-91/02 Report Date: January 23, 1991 Pages: 85 [This is the Executive Summary, not the Abstract. New format.] On June 2, 1990, at 0937 Alaskan Daylight Time, MarkAir, Inc., Flight 3087, a Boeing 737-2X6C, registered in the US as N670MA, crashed about 7.5 miles short of runway 14, Unalakleet, Alaska, while executing a localizer approach to that runway. The flight originated at 0828 at Anchorage International Airport, Anchorage, Alaska. Instrument meteorological conditions existed at the time, and the flight was on an IFR flight plan. The captain, the first officer, and a flight attendant sustained minor injuries. Another flight attendant sustained serious injuries. There were no passengers on board, and the airplane was destroyed. The flight was operated under FAR Part 121. The National Transportation Safety Board determines that the probable cause of this accident was deficiencies in flightcrew coordination, their failure to adequately prepare for and properly execute the UNK LOC Rwy 14 nonprecision approach and their subsequent premature descent. The safety issues discussed in this report include cockpit resource management and approach chart symbology. The Safety Board issued a safety recommendation on approach chart standardization to the Federal Aviation Administration. Safety recommendations were also issued to MarkAir, Inc., on the subjects of cockpit resource management and checklist usage.