# NTSB CEN23LA298: Mariner Unknown, Lino Lakes, MN, July 9, 2023

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Final report
- Date: July 8, 2023, 20:00 local (Jul 9, 2023, 01:00 UTC)
- Place: Lino Lakes, MN
- Coordinates: 45.09, -93.05 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=45.0900&lon=-93.0500&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing-flare/touchdown: Landing gear not configured](https://openairdocs.org/ntsb-events/095)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- Investigation class: Class 4 - Basic report with no Prelim publish
- NTSB office: Central Region
- Parties: Lino Lakes Police Dept, FAA
- NTSB case key (mKey): 192610
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN23LA298
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/192610/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=192610
- Page: https://openairdocs.org/ntsb/CEN23LA298

## Probable cause

The pilot’s failure to retract the landing gear on the amphibious airplane before landing on water.

## Findings

NTSB's coded findings; those marked are part of the probable cause.

- [Action: forgotten action/omission](https://openairdocs.org/ntsb-findings/02041035): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [All aircraft, 440 cases](https://openairdocs.org/ntsb-findings/02041035/cases.md)
- [Use of equip/info: use of equip/system](https://openairdocs.org/ntsb-findings/02063015): Personnel issues › Task performance · Pilot (probable cause); cases with it: [All aircraft, 1,391 cases](https://openairdocs.org/ntsb-findings/02063015/cases.md)
- [Landing gear system: gear extension and retract sys](https://openairdocs.org/ntsb-findings/01023230): Aircraft › Aircraft systems · Not used/operated (probable cause); cases with it: [All aircraft, 416 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md)
- [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md)

## Sequence of events

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

- [Landing-flare/touchdown: Landing gear not configured](https://openairdocs.org/ntsb-events/095) (defining event); cases with it: [All aircraft, 584 cases](https://openairdocs.org/ntsb-events/095/sequence.md)
- [Landing-landing roll: Nose over/nose down](https://openairdocs.org/ntsb-events/096); cases with it: [All aircraft, 2,287 cases](https://openairdocs.org/ntsb-events/096/sequence.md)

## Analysis

The pilot reported that he was flying his amphibious airplane over a neighborhood and decided to do a touch and go on a lake; however, he failed to retract the landing gear and the airplane flipped over when it contacted the water. The airplane came to rest inverted in the lake and sustained substantial damage to both wings. The pilot did not report to the responding law enforcement officer that there were any mechanical malfunctions with the airplane that would have precluded normal operation. The pilot was contacted on multiple occasions, but he did not submit the required National Transportation Safety Board Pilot/Operator Aircraft Accident/Incident Report Form 6120.1.

## Aircraft

- Registration: UNREG (not matched to a registry record)
- Reported make and model: Mariner Unknown
- Category: Airplane
- Serial number: Unknown
- Engines: Unknown unknown
- Damage: Substantial damage
- Flight: Personal, Part 91
- Airworthiness certificate: Special, Experimental (Special)
- Departed: 25D, Forest Lake, MN
- Equipment: Unknown

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 63; injuries: none; private; airplane ratings: single-engine land; medical: unknown, unknown; seat: front

## Weather

- Conditions: Visual (VMC), Day
- Wind: 330° at 7 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 75 °F, dew point 45 °F
- Altimeter: 29.89 inHg
- Observed at: KANE, 8 nm away
- METAR: KANE 090045Z 33007KT 10SM CLR 24/07 A2989

## Docket (3 files)

The files NTSB released with the investigation on October 17, 2023, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=192610. 295 KB in all.

- Memorandum for record - responding law enforcement officer (item 1, PDF, 1 page, 65 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=16143837&FileExtension=pdf&FileName=Memorandum%20of%20Record-Rel.pdf
- Photos (item 2, PDF, 2 pages, 168 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=16144437&FileExtension=pdf&FileName=photo%20sheet-Rel.pdf
- Memorandum of record (item 3, PDF, 1 page, 62 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=16183656&FileExtension=pdf&FileName=MOR-Rel.pdf

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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