# NTSB ANC22LA045: Piper PA-22-150, N6847B, Aleknagik, AK, April 7, 2022

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Final report
- Date: April 6, 2022, 18:00 local (Apr 7, 2022, 02:00 UTC)
- Place: Aleknagik, AK
- Coordinates: 59.2731, -158.61829
- Nearby events: https://openairdocs.org/map.md?lat=59.2731&lon=-158.6183&mi=10
- Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping)
- Defining event: [Taxi-to runway: Loss of control on ground](https://openairdocs.org/ntsb-events/230)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- Investigation class: Class 4 - Basic report with no Prelim publish
- NTSB office: Alaska Regional Office
- Parties: Federal Aviation Administration
- NTSB case key (mKey): 105305
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC22LA045
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/105305/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=105305
- Page: https://openairdocs.org/ntsb/ANC22LA045

## Probable cause

The pilot’s selection of unsuitable terrain for taxi which resulted in an impact with trees.

## Findings

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

- [Info processing/decision: decision making/judgment](https://openairdocs.org/ntsb-findings/02041520): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Piper PA-22-150, 13 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md?model=7102210), [All aircraft, 3,098 cases](https://openairdocs.org/ntsb-findings/02041520/cases.md)
- [Runway/land/takeoff/taxi surface: snow/slush/ice covered surface](https://openairdocs.org/ntsb-findings/03023015): Environmental issues › Physical environment · Decision related to condition (probable cause); cases with it: [Piper PA-22-150, 5 cases](https://openairdocs.org/ntsb-findings/03023015/cases.md?model=7102210), [All aircraft, 219 cases](https://openairdocs.org/ntsb-findings/03023015/cases.md)

## Sequence of events

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

- [Taxi-to runway: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Piper PA-22-150, 48 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=7102210), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md)

## Analysis

The pilot of the ski-equipped airplane reported that while taxiing for takeoff through a narrow tree lined area on sloping hard crusted snow-covered terrain, the airplane began to slide down slope. Unable to arrest the descent, the airplane impacted trees which resulted in substantial damage to the right lift strut. The pilot reported that there were no preaccident mechanical malfunctions or anomalies that would have precluded normal operation.

## Aircraft

- Registration: [N6847B](https://openairdocs.org/aircraft/N6847B), registered now, S/N 22-4146, built 1956 (OpenAirDocs)
- Reported make and model: PIPER PA-22-150
- Registry model: [Piper PA-22-150](https://openairdocs.org/model/piper-pa-22-150) (registry code 7102210) (OpenAirDocs)
- Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 22-4146
- Year built: 1956
- Airframe hours: 4621.3
- Engines: LYCOMING O-360-A2A 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Business, Part 135
- Operator: Wood Tikchik Air
- Registered owner: Romo Mark A
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, September 23, 2021
- Destination: Dillingham, AK
- Flight plan: Company VFR
- Equipment: Unknown

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 51; injuries: none; commercial; airplane ratings: single-engine land, single-engine sea; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review November 2, 2021; seat: left; restraint: lap only; flight hours: 2,058.4 total, 2,043.8 as pilot in command, 2 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 190° at 5 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 28 °F, dew point 18 °F
- Altimeter: 29.78 inHg
- Observed at: PADL, 14 nm away
- METAR: METAR PADL 070156Z 19005KT 10SM CLR M02/M08 A2978 RMK AO2 SLP089 T10221078=

## 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 20220406005209A](https://openairdocs.org/incident/20220406005209A), Apr 6, 2022: Piper PA-22-150, Aleknagik, AK, Substantial damage. Description: during taxi on straight skis, the pilot lost control of the aircraft due to icy conditions on rutted, uneven ground. A rut slid the aircraft…

## Other investigations on N6847B (1)

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 ANC24LA104](https://openairdocs.org/ntsb/ANC24LA104), Sep 19, 2024: Piper PA-22-150 (N6847B), Dillingham, AK, substantial damage. Probable cause: The pilot’s failure to maintain directional control while taxiing in gusting wind conditions.

## Docket (2 files)

The files NTSB released with the investigation on August 31, 2022, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=105305. 646 KB in all.

- Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 8 pages, 538 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14193823&FileExtension=pdf&FileName=6120%20dms_Redacted-Rel.pdf
- Memorandum for record - damage assessment (item 2, PDF, 1 page, 108 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14193882&FileExtension=pdf&FileName=Memorandum%20for%20Record%20Damage-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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