NTSB CAROL · Event
Event ERA13CA077
Registry · N5787S
FAA Aircraft Registry record.
Make / Model
SCHWEIZER SGS 2-33A
Year of manufacture
1968 · 44 years old at event
Engine
NONE NONE
Seats / Engines
2 seats · 1 engine
Last airworthiness date
19680702
ADS-B equipped
Yes — Mode-S A76F7F
Registrant of record
VALLEY SOARING CLUB INC
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
The pilot's improper altitude management in the landing pattern that caused the glider to impact trees on final approach.
Factual narrative
According to the student pilot, while on the downwind leg to runway 26, he "knew that he was too high" for a normal approach. He deployed the spoilers to full and extended the downwind leg to lose altitude. While turning onto base leg for final approach, he retracted the spoilers to one half thinking that he was still too high in the turn. The pilot stated that he flew into a pocket of air that caused the glider to sink. The pilot realized that he was going to be "quite" low and stated that he retracted the spoilers all the way in. While turning on to final approach, he clipped a tree with the left wing and the glider spun around to the left and came to rest in a tree, 25 feet above the ground. Post-accident examination of the airplane by a Federal Aviation Administration inspector revealed that the left and right wing leading edges incurred substantial damage due to impact with trees. Both spoilers were found in the full extended position. The student pilot reported no pre-impact mechanical malfunctions or failures with the airplane that would have precluded normal operation. According to the student pilot, while on the downwind leg to runway 26, he "knew that he was too high" for a normal approach. He deployed the spoilers to full and extended the downwind leg to lose altitude. While turning onto base leg for final approach, he retracted the spoilers to one half thinking that he was still too high in the turn. The pilot stated that he flew into a pocket of air that caused the glider to sink. The pilot realized that he was going to be "quite" low and stated that he retracted the spoilers all the way in. While turning on to final approach, he clipped a tree with the left wing and the glider spun around to the left and came to rest in a tree, 25 feet above the ground. Post-accident examination of the airplane revealed that the left and right wing leading edges incurred substantial damage due to impact with trees. Both spoilers were found in the full extended position. The student pilot reported no pre-impact 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).
- C Personnel issues-Action/decision-Info processing/decision-Decision making/judgment-Pilot - C
- C Aircraft-Aircraft oper/perf/capability-Performance/control parameters-Altitude-Not attained/maintained - C
- F Environmental issues-Physical environment-Object/animal/substance-Tree(s)-Contributed to outcome - F
Verbatim from NTSB's published report. Source file
NTSB_2012_ERA13CA077.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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