# NTSB DEN08CA023: Cessna TP206A, N4635F, Boulder, CO, November 2, 2007

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Data collection · Final report
- Date: November 2, 2007, 13:45 local (19:45 UTC)
- Place: Boulder, CO
- Coordinates: 40.039443, -105.22583
- Nearby events: https://openairdocs.org/map.md?lat=40.0394&lon=-105.2258&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report December 20, 2007
- Report: Approved by Office Director
- Parties: Denver, Colorado
- NTSB case key (mKey): 67047
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN08CA023
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/67047/pdf
- Page: https://openairdocs.org/ntsb/DEN08CA023

## Probable cause

The pilot's misjudgment of altitude.  Contributing factors in this accident were the pilot's intentional low airspeed, his failure to execute a go-around, and the soft terrain.

## Sequence of events

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

- Undershoot, approach - vfr pattern - final approach
  - airspeed - reduced, pilot in command (contributing factor)
  - go-around - not performed, pilot in command (contributing factor)
  - altitude - misjudged, pilot in command (cause)
- Nose over, landing - flare/touchdown
  - terrain condition - soft (contributing factor)

## Analysis

The pilot was returning to the airport after releasing some skydivers.  He was following a training airplane in the traffic pattern and was gaining on it, so he decided to extend his downwind leg.  On final approach to runway 08, his airplane was still gaining on the other airplane.  The pilot reduced power and raised the nose to reduce airspeed to 85 mph.  The airplane was "low and slow" as he passed over a lake, so he added power but not soon enough.  The airplane touched down on the sandy shore of the lake short of the runway.  The nose gear was torn off and the airplane nosed over.

## Factual narrative

According to the pilot, he was returning to 1V5 after releasing some skydivers.  He was following a training airplane in the traffic pattern and was gaining on it, so he decided to extend his downwind leg.  On final approach to runway 08, his airplane was still gaining on the other airplane.  The pilot reduced power and raised the nose to reduce airspeed to 85 mph.  The airplane was "low and slow" as he passed over a lake, so he added power but  not soon enough.  The airplane touched down on the sandy shore of the lake short of the runway.  The nose gear was torn off and the airplane nosed over.  Both wings and wing struts were bent, the aft portion of the fuselage was buckled, and the vertical stabilizer were crushed.

## Aircraft

- Registration: [N4635F](https://openairdocs.org/deregistered/N4635F-2017-03-10), registration cancelled 2017-03-10, S/N P206-0235, built 1966 (OpenAirDocs)
- Reported make and model: Cessna TP206A
- Registry model: [Cessna TP206A](https://openairdocs.org/model/cessna-tp206a) (registry code 2073310) (OpenAirDocs)
- Registry engine: [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series) (registry code 17040, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: P206-235
- Engines: Continental TSIO-520 reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Front Range Skydivers, Inc.
- Airworthiness certificate: Standard, Normal
- Departed: 1V5, Boulder, CO
- Destination: 1V5

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 24; injuries: minor; commercial, student; airplane ratings: multi-engine land, single-engine land; medical: class 2; flight hours: 938 total, 623 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 0° at 0 knots
- Visibility: 40 statute miles
- Lowest ceiling: none
- Temperature: 48 °F, dew point 19 °F
- Altimeter: 30.32 inHg
- Observed at: BJC

## 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 20071102824629A](https://openairdocs.org/incident/20071102824629A), Nov 2, 2007: Cessna TP206A, Boulder, CO, Substantial damage. (-23) On Friday, 11/02/07, at approximately 1:45 pm local time, aircraft N4635F, a Cessna 206, registered to front range skydivers, inc. 222 willow street…

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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