Interstate S1B1 accident near Beluga River, Alaska, May 26, 1990
On May 26, 1990 at about 2:30 am local time, a Interstate S1B1, registered N55AD, was substantially damaged in an accident near Beluga River, Alaska. It was a personal flight under general aviation rules (Part 91). No one was hurt; 1 person was on board or involved. The weather was visual conditions (good weather).
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The NTSB's probable cause their words, unchanged
THE PILOT SELECTED UNSUITABLE TERRAIN. CONTRIBUTING FACTORS WERE THE SOFT TERRAIN AND THE PILOT'S LACK OF EXPERIENCE IN OFF-AIRPORT OPERATIONS.
Source: NTSB aviation accident database, copy made September 29, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- May 26, 1990 · about 2:30 am local time
- Place
- Beluga River, Alaska
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Interstate S1B1 · all S1B1s on the register
- Registration
- N55AD · registry record · serial 1006
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
THE PILOT REPORTED THAT HE WAS MAKING HIS SECOND LANDING AT A SANDBAR DURING A FISHING TRIP. HE SAID THAT HE WAS SEEKING A BETTER LANDING SITE PRIOR TO BRINGING ANOTHER PASSENGER TO THE SANDBAR. DURING THE LANDING ROLL THE MAIN LANDING GEAR ENCOUNTERED A SOFT SPOT AND THE AIRPLANE NOSED OVER.
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Other NTSB records under N55AD the same tail number, which may have belonged to a different aircraft at the time
About this page
Everything above comes from the NTSB's public accident database: the narrative, probable cause and findings are the NTSB's own words, and the coded tables behind its report (pilot, aircraft, flight, weather, injuries, sequence of events) are written out in plain English. Pilots' ages, home towns and medical details are left out on purpose. The docket at the NTSB holds the report as a PDF and the investigation's photographs and documents. This site never names pilots, passengers or anyone else involved. A preliminary report describes what is known soon after the event and can change; the final report, with the probable cause, usually follows one to two years later and this page is refreshed when it does. Case number ANC90LA080.