| Date: | Saturday 2 June 1990 |
| Time: | 09:37 |
| Type: | Boeing 737-2X6C |
| Owner/operator: | MarkAir |
| Registration: | N670MA |
| MSN: | 23121/1025 |
| Year of manufacture: | 1984 |
| Engine model: | Pratt & Whitney JT8D-17A |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Other fatalities: | 0 |
| Aircraft damage: | Destroyed, written off |
| Category: | Accident |
| Location: | 12 km from Unalakleet Airport, AK (UNK) -
United States of America
|
| Phase: | Approach |
| Nature: | Ferry/positioning |
| Departure airport: | Anchorage International Airport, AK (ANC/PANC) |
| Destination airport: | Unalakleet Airport, AK (UNK/PAUN) |
| Investigating agency: | NTSB |
| Confidence Rating: | Accident investigation report completed and information captured |
Narrative:The Boeing struck the ground during a runway 14 DME approach, 12 km short of the runway. The aircraft skidded a few hundred feet, coming to rest with an engine and the tail section separated.
PROBABLE CAUSE: "Deficiencies in flight crew coordination, their failure to adequately prepare for and properly execute the non-precision approach and their subsequent premature descent."
Accident investigation:
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| Investigating agency: | NTSB |
| Report number: | NTSB/AAR-91-02 |
| Status: | Investigation completed |
| Duration: | 7 months |
| Download report: | Final report
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Sources:
NTSB/AAR-91/02
Location
Images:

photo (c) NTSB; 12 km from Unalakleet Airport, AK (UNK); 02 June 1990; (publicdomain)

photo (c) Reinhard Schmidt, via Werner Fischdick; Seattle-Boeing Field International Airport, WA (BFI/KBFI); May 1984
Revision history:
| Date/time | Contributor | Updates |