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Atlas / NTSB / ANC23LA050

NTSB CAROL · Event

Event ANC23LA050

2023-07-13 Matanuska Glacier, Alaska, United States None 1 aircraft Status: Completed

Registry · N460JC

FAA Aircraft Registry record.

Make / Model

AVIAT AIRCRAFT INC A-1B

Year of manufacture

2006 · 17 years old at event

Engine

LYCOMING O-360-A1P (180 hp)

Seats / Engines

2 seats · 1 engine

Last airworthiness date

20060328

ADS-B equipped

Yes — Mode-S A59A66

Registrant of record

COPPER RIVER AIRMOTIVE LLC

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

Probable cause & findings

The airplane’s encounter with downdrafts resulting in decreased performance insufficient to outclimb rising terrain.

Factual narrative

The pilot reported he encountered downdrafts during landing on a remote gravel airstrip near a glacial base camp known for downdrafts and mountain rotors. He elected to depart the airstrip into rising terrain due to more favorable winds. During initial climb out the pilot reported the airplane encountered more downdrafts than expected. Unable to outclimb rising terrain, the pilot performed a forced landing in an area of rough, rock-covered terrain, and during landing the airplane sustained substantial damage to the wings and fuselage. The pilot reported that there were no pre-accident mechanical malfunctions or failures with the airplane that would have precluded normal operation. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

Hierarchical cause / factor breakdown from the FAA bulk avdata database. Each finding tagged C (Cause) or F (Factor).

  • Personnel issues-Action/decision-Info processing/decision-Decision making/judgment-Pilot
  • Personnel issues-Task performance-Planning/preparation-Flight planning/navigation-Pilot
  • Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Climb rate-Not attained/maintained
  • Environmental issues-Conditions/weather/phenomena-Wind-Downdraft-Contributed to outcome

Verbatim from NTSB's published report. Source file NTSB_2023_ANC23LA050.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.