ANC16CA041 · Piper PA18 A150
Piper PA18 A150 · Accident: loss of control on ground during landing
From Lake Hood Seaplane Base (PALH) to Palmer, AK
Event
- NTSB case
- ANC16CA041
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Piper PA18 A150
- Aircraft type
- Piper PA18
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N4231Z
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Lake Hood Seaplane Base (PALH), Anchorage, AKTo Palmer, AK
- Aircraft age
- About 50 years (built 1966)
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Landing · landing roll
- Defining eventThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Loss of control on ground
- Also codedOther events the NTSB coded in the sequence, such as a wire strike after a loss of power. Flight Findings uses them for its kinds of event. Glossary
- Tree(s)
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Environmental issues › Physical environment
- Personnel issues › Action/decision
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The pilot was landing his tailwheel-equipped airplane on a rough and uneven, gravel covered, off-airport landing site adjacent to a river. Prior to landing, the pilot overflew the landing site multiple times at different altitudes for inspection. During the landing rollout the right wing struck tree branches, which resulted in a ground-loop. The airplane sustained substantial damage to the wings, empennage and left horizontal stabilizer. The pilot stated that there were no preaccident mechanical anomalies with the airplane that would have precluded normal operation.
In the recommendation section of the NTSB Accident/Incident Reporting Form 6120.1, the pilot stated that the accident may have been prevented if he would have increased his familiarization of off-airport operations, or selected a more suitable landing site.
Probable cause
The pilot's selection of unsuitable terrain for an off-airport landing, which resulted in a collision with trees and a ground-loop.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ANC16CA041
- Event ID
- 20160712X52459
- Case number
- ANC16CA041
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: fa79b53cd77f69356f5ecb70640131d1843d420116ac53d6bd317a3e0fb17bba; retrieved 2026-09-16T03:39:26.599Z.