ERA22LA407

NTSB accident investigation · Schweizer SGS 2-33A · Mount Bethel, PA · September 3, 2022

Accident · Minor injuriesClass 4 · LimitedFinal report
Date
September 3, 2022, 16:23 local (20:23 UTC)
Place
Mount Bethel, PA
Injuries
1 minor, 1 uninjured
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N17867Schweizer SGS 2-33A
Defining event
Maneuvering-low-alt flying: Loss of lift
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Eastern Region Aviation
Parties
FAA/FSDO
Case key
105904

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

The glider’s encounter with atmospheric conditions, where the lift was not sufficient to maintain flight resulting in an off-airport landing and collision with powerlines.

Findings · 2

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Performance/control parameters: altitudeAircraft › Aircraft oper/perf/capability · Attain/maintain not possibleSchweizer SGS 2-33A: 6 casesAll aircraft: 1,310 casesProbable cause
Temp/humidity/pressure: thermal liftingEnvironmental issues › Conditions/weather/phenomena · Effect on operationSchweizer SGS 2-33A: 3 casesAll aircraft: 53 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The glider took off under aerotow about for a flight in the local soaring area. After flying about 45 minutes the pilot decided to reposition to a different ridge but during his transition, he encountered a loss of lift and started to lose altitude. Unable to gain sufficient lift, he was forced to make an off-airport landing. During his approach, he noticed another glider in the field and there were midfield powerlines. The pilot passed over the glider on the ground but impacted the powerlines. The impact with the powerlines and subsequent collision with terrain resulted in substantial damage to the fuselage and both wings. The pilot reported that there were no pre accident mechanical malfunctions or failures of the glider that would have precluded normal operation.

Aircraft

Registration
N17867
Reported as
Schweizer SGS 2-33A
Category
Glider
Serial number
280
Built
1973
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Aero Club Albatross
Registered owner
Aero Club Albatross
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 5, 2022
Departed
1N7 · Blairstown, NJ
Equipment
None

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
28
Injuries
None
Certificates
Commercial, Flight instructor
Medical
Class 2, With waivers/limitations
Last flight review
October 23, 2020
Seat
Rear
Restraint
4-point
Flight hours
2,002 total · 82 in this make and model · 1,969 as pilot in command · 96 in the last 90 days · 30 in the last 30 days · 5 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
200° at 7 knots
Visibility
10 statute miles
Lowest ceiling
3,500 ft broken
Temperature
73 °F, dew point 63 °F
Altimeter
30.26 inHg
Observed at
MPO, 16 nm away
METAR
KMPO 031953Z AUTO 20007KT 10SM FEW028 BKN035 23/17 A3026 RMK AO2 SLP238 T02280167

Docket · 3

The files NTSB released with the investigation on April 27, 2023, on NTSB’s docket system: statements, records, photos and specialists’ reports. 4.7 MB in all.