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ASN Wikibase Occurrence # 177802
Last updated: 3 July 2021
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Date:11-JUL-2015
Time:07:45
Type:Silhouette image of generic PA22 model; specific model in this crash may look slightly different
Piper PA-22-160 Tri-Pacer
Owner/operator:Private
Registration: N9712D
MSN: 22-6624
Fatalities:Fatalities: 2 / Occupants: 2
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:North Cascades, Twin Sisters Mountain east of Acme, WA -   United States of America
Phase: En route
Nature:Private
Departure airport:Stehekin, WA (K6S9)
Destination airport:Eastsound, WA (KORS)
Investigating agency: NTSB
Narrative:
The noninstrument-rated private pilot was making a cross-country flight over mountainous terrain. Radar data showed the airplane flying in a northwesterly direction and climbing to an altitude of about 10,500 ft mean sea level (msl). About 38 minutes into the flight, the airplane's altitude started to decrease as it continued in a northwesterly direction, and, 6 minutes later, its altitude was 7,500 ft msl. The last radar return occurred 1 minute later at an altitude of 6,000 ft msl. The wreckage was located at the 6,000-ft level of a mountain ridgeline in the vicinity of the final radar return. Photographs of the wreckage revealed that the damage to the airplane was consistent with controlled flight into the terrain. The wreckage was not recovered from the accident site, and no follow-up examination was accomplished.

Weather radar imagery indicated that rain showers moved into the area from the south-southeast as the airplane approached the accident site. These showers extended from about 19,000 ft msl down to ground level. Although no direct weather observations of the accident location were available, the airplane's descent as it approached the site is consistent with an attempt by the pilot to maintain visual meteorological conditions while operating amidst rain and clouds that likely obscured the terrain.


Probable Cause: The noninstrument-rated pilot's continued visual flight into instrument meteorological conditions, which resulted in controlled flight into mountainous terrain.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20150716X91546&key=1
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=9712D

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration:
Download report: Final report
Location


Revision history:

Date/timeContributorUpdates
15-Jul-2015 16:30 gerard57 Added
15-Jul-2015 21:15 Geno Updated [Time, Aircraft type, Registration, Cn, Total fatalities, Total occupants, Other fatalities, Location, Departure airport, Destination airport, Source, Damage, Narrative]
21-Dec-2016 19:30 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
01-Dec-2017 15:04 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]

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