WPR26LA022

NTSB accident investigation · Flight Design Ctsw · Casa Grande, AZ · October 17, 2025

Accident · Minor injuriesClass 3 · LimitedPreliminary report
Date
October 17, 2025, 13:20 local (20:20 UTC)
Place
Casa Grande, AZ
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N531CTFlight Design Ctsw
Defining event
Enroute: Loss of engine power (partial)
Weather
Visual (VMC) · Day
Status
Investigation ongoing
Investigation class
Class 3
NTSB office
Western Pacific Region
Parties
Federal Aviation Administration
FAA report
20251017017319A
Case key
201895

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

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Preliminary report

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

On October 17, 2025, about 13:20 mountain standard time, a Flight Design GMBH CTSW, N531CT, was substantially damaged when it was involved in an accident near Casa Grande, Arizona. The pilot received minor injuries. The airplane was operated as a Title 14 Code of Federal Regulations Part 91personal flight. The pilot reported that he sumped the fuel and found no water or contaminants, then verified 12 gallons of fuel on board by viewing the fuel sight tubes at the root of the overhead wings. The engine runup, departure and climb were uneventful. About 25 minutes into the flight the engine speed slowed unexpectedly and advancing the throttle did not change the engine speed. About 15 seconds later the engine lost total power. The pilot attempted three restarts. During the first restart, the engine started and ran normally for about 5 to 10 seconds then lost total power. During the second restart, the engine ran with partial power for about 5 to 10 seconds followed by a total loss of power. The engine did not start on the third attempt. The pilot maneuvered toward the destination airport and transmitted a mayday call over the radio. The pilot realized that there was insufficient altitude to reach the airport and performed an off-airport landing on desert scrub. Upon touchdown the airplane nosed-over which substantially damaged the fuselage and rudder assembly. The pilot exited the airplane unassisted. The airplane was recovered to a secure facility 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
N531CT
Reported as
Flight Design Ctsw (NO SERIES)
Category
Airplane
Serial number
06-12-11
Built
2006
Airframe hours
505
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · October 31, 2024
Departed
FFZ · Mesa, AZ
Destination
RYN · Tucson, AZ
Airport
CGZ · Casa Grande Municipal, runway 5, 5,200 × 100 ft, concrete
Equipment
ADS-B, Stall warning system, Onboard weather, Airframe parachute, Handheld GPS, Electronic primary flight display, Electronic multifunction display, Auto-pilot, Electronic flight bag or handheld device

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
290° at 7 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
77 °F, dew point 45 °F
Altimeter
29.91 inHg
Observed at
CGZ, 3 nm away
METAR
METAR KCGZ 171956Z AUTO 29007KT 10SM CLR 25/07 A2991 RMK AO2 SLP120 T02500067 PNO $=

FAA reports on this event · 1

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