WPR20CA151

NTSB accident investigation · Let L 33 Solo · Arlington, WA · May 11, 2020

Accident · No injuriesClass 4 · Data collectionFinal report
Date
May 11, 2020, 12:53 local (19:53 UTC)
Place
Arlington, WA
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N355BALet L 33 Solo
Defining event
Landing: 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
Western Pacific Region
Parties
Federal Aviation Administration
Case key
101295

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 loss of lift while on final approach which resulted in a hard off-airport landing.

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.

Temp/humidity/pressure: thermal liftingEnvironmental issues › Conditions/weather/phenomena · Effect on operationLet L 33 SOLO: 1 caseAll aircraft: 53 casesProbable cause
Performance/control parameters: altitudeAircraft › Aircraft oper/perf/capability · Not attained/maintainedLet L 33 SOLO: 2 casesAll aircraft: 1,310 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 pilot reported that while on final approach to land, the ground speed decreased and the glider descended faster than expected. Unable to reach the runway, he diverted to a gravel area to land out. The glider landed hard, and during the landing roll he heard a loud bang that was later identified as a pothole. The glider sustained substantial damage to the fuselage. The pilot reported no mechanical malfunctions with the glider that would have precluded normal operation.

Aircraft

Registration
N355BA
Reported as
Let L 33 Solo (No Series)
Category
Glider
Serial number
990506
Built
1999
Airframe hours
814.35
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · May 8, 2020
Departed
AWO · Arlington, WA
Destination
AWO · Arlington, WA
Airport
AWO · Arlington Muni, runway 34, 5,332 × 100 ft, asphalt
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
58
Injuries
None
Certificates
Student, Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
BasicMed, Without waivers/limitations
Seat
Center
Restraint
4-point
Flight hours
4,561 total · 4 in this make and model · 15 in the last 90 days · 7 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
350° at 5 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
75 °F, dew point 46 °F
Altimeter
30.01 inHg
Observed at
KPAE, 16 nm away

Docket · 3

The files NTSB released with the investigation on October 9, 2020, on NTSB’s docket system: statements, records, photos and specialists’ reports. 7.8 MB in all.