# NTSB DEN86LA051: Cessna 172N, N7609F, Longmont, CO, December 20, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: December 20, 1985, 08:30 local (15:30 UTC)
- Place: Longmont, CO
- Coordinates: 40.169586, -105.110389 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.1696&lon=-105.1104&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16904
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN86LA051
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16904/pdf
- Page: https://openairdocs.org/ntsb/DEN86LA051

## Sequence of events

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

- On ground/water encounter with terrain/water, landing - flare/touchdown
  - facility,inadequate design(standard/requirement), airport personnel
  - airport/facilities - foreign substance covered
  - in-flight planning/decision - poor, pilot in command (cause)
- Nose over, landing - roll

## Analysis

ACCORDING TO THE STUDENT PLT HE MADE A NORMAL APCH TO LANDING. THE RUNWAY HAD NOT BEEN CLEARED OF SNOW TO ITS FULL WIDTH. THE ACFT'S LEFT WHEEL TOUCHED THE SNOW PULLING THE ACFT OFF THE RWY AND THE ACFT FLIPPED OVER.

## Aircraft

- Registration: [N7609F](https://openairdocs.org/aircraft/N7609F), registered now, S/N 17273267, built 1979 (OpenAirDocs)
- Reported make and model: CESSNA 172N
- Registry model: [Cessna 172N](https://openairdocs.org/model/cessna-172n) (registry code 2072434) (OpenAirDocs)
- Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 17273267
- Airframe hours: 1206
- Engines: LYCOMING O-320-H2AD 150 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Registered owner: Rainbow Aviation
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, December 18, 1985
- Departed: BJC, BROOMFIELD, CO
- Airport: 2V2, Longmont Municipal, runway 29, 4,200 × 60 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 19; student; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 35 total, 35 in this make and model, 3 as pilot in command, 13 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 320° at 5 knots, gusting 10
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 27 °F
- Observed at: 2V2

## 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 19851220063339A](https://openairdocs.org/incident/19851220063339A), Dec 20, 1985: Cessna 172N, Longmont, CO, Substantial damage. Aircraft flipped over during rollout. Touchdown made left of center with wheel in snow. Sides of runway unplowed.

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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