This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed.
https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=N344CS
On August 11, 2025, at about 1146 local time, a De Havilland Canada DHC-6-300 Twin Otter, N344CS, registered to Transport Company LLC out of Colorado Springs, Colorado, and being operated by Rampart Aviation, sustained substantial damage when it was involved in an accident at San Clemente Island Naval Auxiliary Landing Field (NUC/KNUC), San Clemente Island, California. Injury status is unknown at this point.
The NTSB added the event as an accident with case number WPR25LA250. Still awaiting further information from the FAA reports that will be released today. This event was not reported on social media/news outlets.
Preliminary ADS-B data shows that the airplane departed the San Diego-North Island NAS (NZY/KNZY), San Diego, California, at about 1109 LT, on a flight to KNUC. The airplane landed on runway 24 and suffered a runway excursion to the left.
Figure 1: ADS-B Exchange data
KNUC features a single concrete runway 6/24 that is 9301 x 200 ft.
The KNUC weather observation recorded at 1156 (10 minutes after the accident) noted: winds 210 at 8 knots, visibility 10 statute miles, an overcast (OVC) ceiling at 600ft AGL, temperature 18°C, dew point 14°C, and an altimeter setting of 30.00 inches of mercury (inHg).
- METARs:
METAR KNUC 111756Z 23008KT 10SM OVC005 18/14 A3000 RMK AO2 SLP156 6//// T01780144 10183 20156 53004 PNO $
METAR KNUC 111856Z 21008KT 10SM OVC006 18/14 A3000 RMK AO2 SLP157 T01830144 PNO $
Second runway excursion in 2 days resulting in substantial damage.
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