WPR26LA158

NTSB accident investigation · Alexander Schleicher ASH 31 MI · Williams, CA · April 13, 2026

Accident · Minor injuriesClass 3 · LimitedPreliminary report
Date
April 13, 2026, 10:51 local (17:51 UTC)
Place
Williams, CA
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N77UKAlexander Schleicher ASH 31 MI
Defining event
Initial climb: Loss of engine power (total)
Weather
Visual (VMC) · Day
Status
Investigation ongoing
Investigation class
Class 3
NTSB office
Western Pacific Region
Parties
FAA
FAA report
20260413003419A
Case key
202810

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

On this page

Preliminary report

What NTSB knew early in the investigation. It may change in the final report.

On April 13, 2026, about 1051 Pacific standard time, an experimental Alexander Schleicher GMBH and Co., Ash 31 Mi Glider, N77UK, was substantially damaged when it was involved in an accident near Williams, California. The pilot sustained minor injuries. The glider was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot reported that he departed from Williams Gliderport (CN12), Williams, California, in the self-launching motorglider. During climbout, about 200 ft above ground level, the engine lost power. The pilot verified that the emergency fuel pump was on and then reviewed his landing options. There were power lines straight ahead, so he opted to perform a right turn back to the runway. However, during the turn, the right wingtip struck terrain. Subsequently, the glider’s nose and main gear impacted a plowed field and resulted in substantial damage to the fuselage and wings. Witnesses located at the airport reported observing the glider depart uneventfully until it passed behind a hangar and was no longer visible. Shortly thereafter, the witnesses observed the glider again in a steep right turn. The glider was recovered for further examination.

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.

Aircraft

Registration
N77UK
Reported as
Alexander Schleicher ASH 31 MI
Category
Glider
Serial number
31088
Built
2013
Airframe hours
1,060
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · February 17, 2026
Destination
Same as departure
Airport
CN12 · Williams Gliderport, runway 34, 2,500 × 40 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.

Weather

Conditions
Visual (VMC) · Day
Wind
350° at 9 knots
Visibility
10 statute miles
Temperature
61 °F, dew point 46 °F
Altimeter
30.11 inHg
Observed at
KBAB, 33 nm away
METAR
METAR KBAB 131755Z 35009KT 10SM SCT024 16/08 A3011 RMK AO2A SLP199 T01570075 10157 20078 51006 $

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.