# NTSB ANC84LA029: Cessna 172RG, N4856V, Big Lake, AK, January 7, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: January 7, 1984, 10:15 local (19:15 UTC)
- Place: Big Lake, AK
- Location: 61.5450° N, 149.8180° W: Placed by OpenAirDocs: center of Big Lake, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=61.5450&lon=-149.8180&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 4266
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC84LA029
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/4266/pdf
- Page: https://openairdocs.org/ntsb/ANC84LA029

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- In flight collision with terrain/water, approach - vfr pattern - final approach
  - terrain condition - snowbank (cause)
  - emergency procedure - simulated, pilot in command(cfi) (cause)
  - proper altitude - not maintained, pilot in command(cfi) (cause)
  - clearance - improper, dual student (cause)
  - procedures/directives - not followed, pilot in command(cfi) (cause)

## Analysis

THE DUAL STUDENT AND INSTRUCTOR WERE PRACTICING EMERGENCY PROCEDURES. DURING THE TURN ONTO FINAL APPROACH THE LEFT MAIN LANDING GEAR AND LEFT WING STRUCK A SNOWBANK. FLYING CLUB PROCEDURES STATE THAT NO EMERGENCY PRACTICE PROCEDURE WILL BE CONDUCTED BELOW 500 FT AGL.

## Aircraft

- Registration: [N4856V](https://openairdocs.org/aircraft/N4856V), registered now, S/N 172RG0401, built 1980 (OpenAirDocs)
- Reported make and model: CESSNA 172RG
- Registry model: [Cessna 172RG](https://openairdocs.org/model/cessna-172rg) (registry code 2072438) (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: 172RG0401
- Airframe hours: 1105
- Engines: LYCOMING O-350-F1A6 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Registered owner: Elmendorf Aero Club
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, April 4, 1983, 72 hours before
- Departed: EDF, ELMENDORF, AK
- Flight plan: VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 23; commercial, flight instructor; airplane ratings: single-engine land, single-engine sea, multi-engine land; instrument ratings: airplane; medical: valid medical--no waivers/lim.; seat: left; flight hours: 1,823 total, 80 in this make and model, 1,703 as pilot in command, 213 in the last 90 days, 150 in the last 30 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 5 °F, dew point 10 °F
- Altimeter: 29.00 inHg
- Observed at: EDF, 23 nm away

## 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 19840107006439A](https://openairdocs.org/incident/19840107006439A), Jan 7, 1984: Cessna 172RG, Big Lake, AK, Substantial damage. Instructor allowed aircraft wing to collide with snowbank along runway during practice emergency landing.

## Other investigations on N4856V (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 ANC86LA131](https://openairdocs.org/ntsb/ANC86LA131), Aug 19, 1986: Cessna 172RGII (N4856V), Kotlik, 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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