ASN Aircraft accident Boeing 737-2X6C N670MA Unalakleet Airport, AK (UNK)
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Status:Accident investigation report completed and information captured
Date:Saturday 2 June 1990
Type:Silhouette image of generic B732 model; specific model in this crash may look slightly different
Boeing 737-2X6C
Registration: N670MA
MSN: 23121/1025
First flight: 1984-05-02 (6 years 1 months)
Engines: 2 Pratt & Whitney JT8D-17A
Crew:Fatalities: 0 / Occupants: 4
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 0 / Occupants: 4
Aircraft damage: Destroyed
Aircraft fate: Written off (damaged beyond repair)
Location:12 km (7.5 mls) from Unalakleet Airport, AK (UNK) (   United States of America)
Phase: Approach (APR)
Departure airport:Anchorage International Airport, AK (ANC/PANC), United States of America
Destination airport:Unalakleet Airport, AK (UNK/PAUN), United States of America
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:

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:

Investigating agency: NTSB
Status: Investigation completed
Duration: 235 days (8 months)
Accident number: NTSB/AAR-91-02
Download report: Final report

Premature descent
Controlled Flight Into Terrain (CFIT) - Mountain

» NTSB/AAR-91/02

Follow-up / safety actions

NTSB issued 4 Safety Recommendations

Show all...


photo of Boeing-737-2X6C-N670MA
accident date: 02-06-1990
type: Boeing 737-2X6C
registration: N670MA
photo of Boeing-737-2X6C-N670MA
accident date: 02-06-1990
type: Boeing 737-2X6C
registration: N670MA

This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Anchorage International Airport, AK to Unalakleet Airport, AK as the crow flies is 625 km (391 miles).
Accident location: Exact; as reported in the official accident report.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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Boeing 737-200

  • 1114 built
  • 48th loss
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