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ERA21LA329

2021-07-15 · Sterling, Massachusetts, United States · None · 1 aircraft · Status: Completed

Airport 3B3

Current FAA registration · N129MG

Make / Model
ALEXANDER SCHLEICHER GMBH & CO ASW 27-18
Seats / Engines
1 seats · 1 engine
ADS-B equipped
Yes — Mode-S A0763B

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

Probable cause & findings

The pilot’s failure to maintain the glider’s stability in the roll axis during the takeoff roll, which resulted in a dragged wingtip and ground loop.

Factual narrative

According to the pilot, there was a slight depression in the narrow, paved strip used for glider takeoffs, and that during the takeoff roll, the left wing “flexed” and “dipped” such that the wingtip contacted the turf which created the pivot point around which the glider “ground-looped” which fractured the empennage aft of the cockpit. The pilot added that there had been “3 weeks of heavy rain” prior to the day of the accident and that the grass on either side of the takeoff strip was longer than usual, which reduced his wingtip clearance. He stated that while he had successfully departed the strip earlier that day, a lower grass height would have lowered his risk exposure during the takeoff run. The pilot reported that there were no pre-accident mechanical malfunctions or anomalies that would have precluded normal operation. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

FAA avdata. C = Cause, F = Factor.

  • — Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Lateral/bank control-Not attained/maintained
  • — Personnel issues-Task performance-Use of equip/info-Aircraft control-Pilot

Verbatim from NTSB's published report. Source file NTSB_2021_ERA21LA329.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.