# NTSB WPR26LA348: Piper PA-18-150, N4500W, Roundup, MT, September 15, 2026

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Investigation open
- Date: September 15, 2026, 17:00 local (23:00 UTC)
- Place: Roundup, MT · backcountry landing area
- Coordinates: 46.74685, -108.86808 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=46.7469&lon=-108.8681&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing-landing roll: Nose over/nose down](https://openairdocs.org/ntsb-events/096)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Investigation ongoing
- Investigation class: Class 4 - Basic report with no Prelim publish
- NTSB office: Western Pacific Region
- Parties: FAA
- NTSB case key (mKey): 203854
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR26LA348
- Latest NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/203854/pdf
- Page: https://openairdocs.org/ntsb/WPR26LA348

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230); cases with it: [Piper PA-18-150, 109 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=7101828), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md)
- [Landing-landing roll: Nose over/nose down](https://openairdocs.org/ntsb-events/096) (defining event); cases with it: [Piper PA-18-150, 83 cases](https://openairdocs.org/ntsb-events/096/sequence.md?model=7101828), [All aircraft, 2,287 cases](https://openairdocs.org/ntsb-events/096/sequence.md)

## Aircraft

- Registration: [N4500W](https://openairdocs.org/aircraft/N4500W), registered now, S/N 18-8009019, built 1980 (OpenAirDocs)
- Reported make and model: PIPER PA-18-150
- Registry model: [Piper PA-18-150](https://openairdocs.org/model/piper-pa-18-150) (registry code 7101828) (OpenAirDocs)
- Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 18-8009019
- Year built: 1980
- Airframe hours: 4039
- Damage: Substantial damage
- Flight: Personal, Part 91
- Airworthiness certificate: Standard, Normal
- Departed: 9U1, Wilsall, MT
- Airport: NA, Back country Area
- Equipment: Stall warning system, ADS-B

## Weather

- Conditions: Visual (VMC), Day
- Wind: 220° at 16 knots, gusting 20
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 66 °F, dew point 41 °F
- Altimeter: 30.03 inHg
- Observed at: K1NM, 20 nm away
- METAR: METAR K1NM 152155Z AUTO 22016G20KT 10SM CLR 19/05 A3003 RMK AO2 SLP165 T01880053 $

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 20260915012659A](https://openairdocs.org/incident/20260915012659A), Sep 15, 2026: Piper PA-18-150, Roundup, MT, Substantial damage. On September 15, 2026, a Piper cub, PA-18 was landing at a back country landing area near grass range, Montana. Upon landing rollout, the aircraft rolled over…

## Other investigations on N4500W (4)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB GAA19CA045](https://openairdocs.org/ntsb/GAA19CA045), Oct 27, 2018: Piper PA18 (N4500W), Denver, CO, substantial damage. Probable cause: The pilot's failure to maintain directional control of the airplane during landing in gusting wind conditions.
- [NTSB ANC03LA107](https://openairdocs.org/ntsb/ANC03LA107), Sep 3, 2003: Piper PA-18 (N4500W), Koliganek, AK, substantial damage. Probable cause: The pilot's failure to maintain adequate airspeed during an aborted landing, which resulted in an inadvertent stall and subsequent collision with terrain.
- [NTSB ANC97TA045](https://openairdocs.org/ntsb/ANC97TA045), Apr 1, 1997: Piper PA-18 (N4500W), Noatak, AK, substantial damage. Probable cause: failure of the pilot to maintain directional control of the airplane, which resulted in an inadvertent ground loop and damage to the airplane. Factors associated with the accident were: the ice/snow…
- [NTSB ANC92T#A12](https://openairdocs.org/ntsb/ANC92T%23A12), Dec 19, 1991: Piper PA-18-150 (N4500W), Anchorage, AK, substantial damage

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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