WPR25LA155

NTSB accident investigation · Piper PA-18-150 · Enumclaw, WA · May 10, 2025

Accident · No injuriesClass 3 · LimitedPreliminary report
Date
May 10, 2025, 14:12 local (21:12 UTC)
Place
Enumclaw, WA · farm field
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N333TMPiper PA-18-150
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
Federal Aviation Administration, Lycoming Engines
FAA report
20250510018619A
Case key
200149

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 May 10, 2025, about 1412 Pacific daylight time, a Piper PA-18-150, N333TM, was substantially damaged when it was involved in an accident near Enumclaw, Washington. The pilot was not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 glider tow flight. The pilot was conducting glider tow operations from Bergseth Field Airport (WN76), Enumclaw, Washington. According to the pilot, he departed WN76 and was conducting turns consistent with the operator’s standard departure procedure, with a glider in tow. At about 200 ft above ground level (agl), and in a left bank, the engine abruptly lost all power. The pilot lowered the airplane’s nose and verified that the fuel selector was positioned on the left fuel tank, carburetor heat was off, throttle was full forward, and magneto switch was on BOTH. The pilot released the glider from its tow and initiated a forced landing to a field about 1 mile northwest of WN76. During the landing, the airplane impacted a fence and subsequently ground looped. The pilot reported that the accident flight was the fourth flight of the day, and that the airplane had started the day’s flights with “slightly less than half tanks on either side.” Prior to the accident takeoff, the left wing fuel tank sight gauge indicated approximately ¼ - ½ full, and the right wing fuel tank indicated approximately ¼ full. Postaccident examination of the airplane revealed substantial damage to the left wing, both left and right wing lift struts, and fuselage. The wreckage was recovered to a secure location 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
N333TM
Reported as
Piper PA-18-150
Category
Airplane
Serial number
18-8939
Built
1971
Airframe hours
3,631
Damage
Substantial damage
Flight
Glider tow · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · March 31, 2025 · 20 hours before
Departed
WN76 · Enumclaw, WA
Destination
WN76 · Enumclaw, WA
Airport
WN76 · Bergseth Field
Equipment
ADS-B

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
Calm
Visibility
10 statute miles
Lowest ceiling
7,000 ft broken
Temperature
63 °F, dew point 34 °F
Altimeter
30.03 inHg
Observed at
KPLU, 17 nm away
METAR
KPLU 102115Z AUTO 00000KT 10SM FEW060 BKN070 17/01 A3003

FAA reports on this event · 1

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

Other investigations on N333TM · 1

Matched to the same aircraft by N-number and date.