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Atlas / NTSB / GAA19CA132

NTSB CAROL · Event

Event GAA19CA132

2019-01-27 McGrath, Alaska, United States None 1 aircraft Status: Completed

Registry · N8170C

FAA Aircraft Registry record.

Make / Model

PIPER PA-18A

Year of manufacture

1954 · 65 years old at event

Engine

LYCOMING 0-320 SERIES (180 hp)

Seats / Engines

2 seats · 1 engine

Last airworthiness date

19630301

ADS-B equipped

Yes — Mode-S AB25B8

Registrant of record

GIBBENS BRETT S

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

Probable cause & findings

The pilot's selection of unsuitable terrain for landing, which resulted in the landing gear collapsing.

Factual narrative

The pilot of the ski-equipped airplane reported that, while landing off-airport on a snow-covered field, he side loaded the landing gear on the left side against a large "tussock" hidden by the snow. The left landing gear folded under the airplane, causing the left wingtip to drop into the snow and impact a snow-covered tussock. The airplane sustained substantial damage to the left wing. The pilot reported that there were no preimpact mechanical failures or malfunctions with the airplane that would have precluded normal operation. The pilot of the ski-equipped airplane reported that, while landing off-airport on a snow-covered field, he side-loaded the landing gear on the left side against a large "tussock" hidden by the snow. The left landing gear folded under the airplane, which caused the left wingtip to drop into the snow and impact a snow-covered tussock. The airplane sustained substantial damage to the left wing. The pilot reported that there were no preimpact mechanical failures or malfunctions 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).

  • C Environmental issues-Physical environment-Runway/land/takeoff/taxi surface-Snow/slush/ice covered surface-Decision related to condition - C
  • C Personnel issues-Action/decision-Info processing/decision-Decision making/judgment-Pilot - C
  • Environmental issues-Physical environment-Runway/land/takeoff/taxi surface-Snow/slush/ice covered surface-Effect on equipment
  • Personnel issues-Psychological-Attention/monitoring-Monitoring environment-Pilot
  • Environmental issues-Physical environment-Object/animal/substance-(general)-Contributed to outcome

Verbatim from NTSB's published report. Source file NTSB_2019_GAA19CA132.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.