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Atlas / NTSB / GAA18CA469

NTSB CAROL · Event

Event GAA18CA469

2018-08-04 Kenai, Alaska, United States Airport · PVT Minor 1 aircraft Status: Completed

Registry · N8443B

FAA Aircraft Registry record.

Make / Model

RANS RANS S7S

Year of manufacture

2006 · 12 years old at event

Engine

ROTAX 912S (100 hp)

Seats / Engines

2 seats · 1 engine

Last airworthiness date

20060928

ADS-B equipped

Yes — Mode-S AB9178

Registrant of record

DERLETH SCOTT M

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

Probable cause & findings

The pilot's exceedance of the airplane's climb capability due to his use of full flaps during a short-field takeoff, his failure to attain a positive climb rate after takeoff, and his exceedance of the airplane’s critical angle of attack, which resulted in an aerodynamic stall.

Factual narrative

The pilot in the tailwheel-equipped airplane reported that during the takeoff roll about 40 knots airspeed, with full flaps and about 50 percent of the 900ft runway remaining, the airplane lifted off and began to climb. The airplane climbed above the tree line but then descended into ground effect. The pilot attempted to clear the trees ahead, but the airplane stalled. The left wing dropped, and the airplane descended below the tree line and touched down on the main landing gear but collided with trees and it came to rest inverted. The airplane sustained substantial damage to the left wing lift struts. The pilot reported that he could have utilized the additional runway surface and held the airplane on the ground to achieve a more desirable airspeed. Additionally, the pilot operating handbook does not suggest the use of full flap application during short-field takeoffs. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. The pilot in the tailwheel-equipped airplane reported that, during the takeoff roll about 40 knots airspeed with full flaps and about 50% of the 900-ft-long runway remaining, the airplane lifted off and began to climb. The airplane climbed above the tree line but then descended into ground effect. The pilot attempted to clear the trees ahead, but the airplane stalled. The left wing dropped, and the airplane descended below the tree line and touched down on the main landing gear, collided with trees, and then came to rest inverted. The airplane sustained substantial damage to the left wing lift struts. The pilot reported that he could have used the additional runway surface and held the airplane on the ground to achieve a more desirable airspeed. Additionally, the Pilot’s Operating Handbook stated not to use full flap application during short-field takeoffs. The pilot reported that there were no preaccident 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 Personnel issues-Task performance-Use of equip/info-Aircraft control-Pilot - C
  • C Personnel issues-Task performance-Use of equip/info-Use of equip/system-Pilot - C
  • C Aircraft-Aircraft oper/perf/capability-Aircraft capability-Climb capability-Capability exceeded - C
  • C Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Angle of attack-Capability exceeded - C
  • Environmental issues-Physical environment-Object/animal/substance-Tree(s)-Contributed to outcome

Verbatim from NTSB's published report. Source file NTSB_2018_GAA18CA469.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

Related research

What the literature says.

Academic papers and agency reports matching this event's aircraft type or causal vocabulary (stall). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.

Browse the full corpus — academia portal ↗