# NTSB ANC22LA072: Christen Industries A-1, N9622V, Point MacKenzie, AK, September 1, 2022

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Class 4 · Limited · Final report
- Date: August 31, 2022, 17:30 local (Sep 1, 2022, 01:30 UTC)
- Place: Point MacKenzie, AK
- Coordinates: 61.27, -150.15
- Nearby events: https://openairdocs.org/map.md?lat=61.2700&lon=-150.1500&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing: Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241)
- Highest injury: Minor injuries
- Injuries: 2 minor
- 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 (FAA)
- NTSB case key (mKey): 105873
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC22LA072
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/105873/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=105873
- Page: https://openairdocs.org/ntsb/ANC22LA072

## Probable cause

The pilot’s improper monitoring and failure to maintain airspeed during a critical phase of flight, which resulted in an exceedance of the airplane’s critical angle of attack, an aerodynamic stall, and subsequent impact with terrain.

## Findings

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

- [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Christen Industries A-1, 8 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=221020X), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md)
- [Performance/control parameters: airspeed](https://openairdocs.org/ntsb-findings/01062010): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Christen Industries A-1, 1 case](https://openairdocs.org/ntsb-findings/01062010/cases.md?model=221020X), [All aircraft, 1,681 cases](https://openairdocs.org/ntsb-findings/01062010/cases.md)

## Sequence of events

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

- [Landing: Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241) (defining event); cases with it: [Christen Industries A-1, 2 cases](https://openairdocs.org/ntsb-events/241/sequence.md?model=221020X), [All aircraft, 1,529 cases](https://openairdocs.org/ntsb-events/241/sequence.md)

## Analysis

The pilot reported that, during a go around maneuver at an off-airport site, he “did not maintain sufficient speed leading to a low wing stall at insufficient altitude to correct.” Subsequently, the airplane impacted terrain, which resulted in substantial damage to the left wing, wing lift strut, and fuselage. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.

## Aircraft

- Registration: [N9622V](https://openairdocs.org/aircraft/N9622V), registered now, S/N 1154, built 1990 (OpenAirDocs)
- Reported make and model: CHRISTEN INDUSTRIES INC A-1
- Registry model: [Christen Industries A-1](https://openairdocs.org/model/christen-industries-a-1) (registry code 221020X) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 1154
- Year built: 1990
- Airframe hours: 1945
- Engines: LYCOMING O&VO-360 SER 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, August 8, 2022, 5 hours before
- Departed: Z41, Anchorage, AK
- Destination: Same as departure
- Equipment: None

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 57; injuries: minor; private; airplane ratings: single-engine land; medical: class 3, without waivers/limitations; last flight review May 26, 2022; seat: front; restraint: 5-point; flight hours: 1,157 total, 1,156.9 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 330° at 6 knots
- Visibility: 10 statute miles
- Lowest ceiling: 6,000 ft overcast
- Temperature: 52 °F, dew point 48 °F
- Altimeter: 29.58 inHg
- Icing: Unknown
- Turbulence: Unknown
- Observed at: PAMR, 9 nm away
- METAR: PAMR 010153Z 33006KT 10SM -RA OVC060 11/09 A2958 RMK AO2 SLP018 P0007 T01110094

## 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 20220831016859A](https://openairdocs.org/incident/20220831016859A), Aug 31, 2022: Christen Industries Inc A-1, Point Mackenzie, AK, Substantial damage. Operating off airport near Point Mackenzie, AK, pilot reported strong winds from southwest then shifting north during landing attempt. Pilot initiated…

## Other investigations on N9622V (2)

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 ANC06CA077](https://openairdocs.org/ntsb/ANC06CA077), Jun 19, 2006: Christen Industries A-1 (N9622V), Takotna, AK, substantial damage. Probable cause: The pilot's excessive use of brakes during the landing roll. A factor associated with the accident was soft terrain.
- [NTSB ANC95LA069](https://openairdocs.org/ntsb/ANC95LA069), Jun 11, 1995: Christen Industries A-1 (N9622V), Tyonek, AK, substantial damage. Probable cause: THE PILOT'S SELECTION OF AN UNSUITABLE LANDING SITE. A FACTOR ASSOCIATED WITH THE ACCIDENT IS THE ROUGH AND UNEVEN SANDBAR.

## Docket (2 files)

The files NTSB released with the investigation on November 11, 2022, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=105873. 1.4 MB in all.

- Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 1.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14573825&FileExtension=pdf&FileName=ANC22LA072%20%206120_1_Redacted-Rel.pdf
- Photo (item 2, PDF, 1 page, 85 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14574314&FileExtension=pdf&FileName=Photo%20Array%20ANC22LA072-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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