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ASN Wikibase Occurrence # 27303
Last updated: 18 September 2019
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Date:05-JAN-1993
Time:20:21
Type:Silhouette image of generic MU2 model; specific model in this crash may look slightly different
Mitsubishi MU-2B-35
Owner/operator:Bering Air Inc
Registration: N900YH
C/n / msn: 584
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:18 nautical miles southeast of Nome, Alaska -   United States of America
Phase: En route
Nature:Ferry/positioning
Departure airport:Bethel, Alaska (PABE/BET)
Destination airport:Nome, Alaska (PAOM/OME)
Investigating agency: NTSB
Narrative:
After making a refuelling stop, the pilot took off at night and was cruising at FL 200. After about 30 minutes of flight, the right engine fuel filter bypass warning light illuminated. About 2 minutes later, the same warning light for the left engine came on. Shortly after this the right, then the left engine, lost power. The pilot made a forced landing on a moving ice pack in the Bering Sea, which resulted in substantial damage.

The subsequent investigation found ice in the engine and main fuel screens. Significant amounts of water and/or ice were found in the three fuel tanks the aircraft had been refuelled from. A higher than normal amount of water was also found in the fuel sample taken from the nozzle of the refuelling tanker. The flight manual required that an approved ice inhibitor be added to the fuel, if not pre-mixed.

Fuel at the refuelling stop was not pre-mixed and the pilot had no icing inhibitor (PRIST) with him on this flight. He did not drain fuel from the tanks during the pre-flight, since the temperature was so cold he feared the drain might freeze open.

The NTSB determined the probable cause to be: Fuel starvation due to improper refuelling procedures by the FBO personnel, inadequate pre-flight by the pilot, and resultant ice in the fuel, which blocked fuel flow to the engines. A factor was the lack of suitable terrain for a forced landing.

Sources:

1. NTSB Accident Report ANC93LA025 at https://www.ntsb.gov/aviationquery/brief2.aspx?ev_id=20001211X11642&ntsbno=ANC93LA025&akey=1
2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?nNumberTxt=900YH
3. http://www.scramble.nl/civil-database/details?bt=mu2&af=389
4. http://web.archive.org/web/20170219140446/http://www.baaa-acro.com/1993/archives/crash-of-a-mitsubishi-mu-2-marquise-in-nome/


Revision history:

Date/timeContributorUpdates
27-Sep-2008 01:00 ASN archive Added
12-Sep-2013 16:51 wf Updated [Operator, Phase, Source, Narrative]
30-Jan-2014 07:37 onward Updated [Date, Time, Operator, Location, Phase, Nature, Departure airport, Destination airport, Source, Narrative]
06-Mar-2016 00:57 Dr.John Smith Updated [Operator, Location, Departure airport, Destination airport, Source, Narrative]
21-Dec-2016 19:14 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:16 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:20 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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