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ASN Wikibase Occurrence # 38177
 
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Date:17-JUL-1999
Time:13:00
Type:Silhouette image of generic P337 model; specific model in this crash may look slightly different    
Cessna T337G Turbo Super Skymaster
Owner/operator:Private
Registration: N98C
MSN: P3370135
Fatalities:Fatalities: 2 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Snoqualmie Pass, WA -   United States of America
Phase: Unknown
Nature:Private
Departure airport:Lewistown, MT (LWT)
Destination airport:Seattle, WA (BFI)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
While en route from Lewistown, Montana, to Olympia, Washington, on an instrument flight plan, the pilot developed a problem with the aircraft's autopilot and elected to cancel his instrument flight plan and proceed to Seattle, Washington, where repairs to the aircraft could be made. The pilot stated he was going to continue on his IFR flight plan until reaching Ellensburg, Washington, and then '...change to VFR and drop down and fly through the pass.' Approximately 30 minutes after the pilot canceled his IFR flight plan, a witness observed an aircraft 'with two tail fins' fly out of the clouds and proceed westbound along the Interstate Highway. The witness, who did not see the crash, also stated that the visibility was 100-300 feet, and the clouds were low to the ground. The aircraft collided with mountainous terrain approximately 25 miles east of Seattle, Washington.

Probable Cause: The pilot's failure to maintain clearance from mountainous terrain while maneuvering below low ceilings. Factors include low ceilings and inadequate in-flight planning.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X19360&key=1


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
21-Dec-2016 19:23 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
14-Dec-2017 08:40 ASN Update Bot Updated [Operator, Source, Narrative]

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