# NTSB DEN86LA233: Cessna 177B, N34043, Broomfield, CO, August 18, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: August 18, 1986, 13:00 local (19:00 UTC)
- Place: Broomfield, CO
- Coordinates: 39.940032, -105.060768 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.9400&lon=-105.0608&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 17037
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN86LA233
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/17037/pdf
- Page: https://openairdocs.org/ntsb/DEN86LA233

## Sequence of events

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

- Loss of control - in flight, landing - flare/touchdown
  - weather condition - gusts (contributing factor)
  - compensation for wind conditions - improper, pilot in command (cause)
- On ground/water encounter with terrain/water, landing - roll
  - terrain condition - rough/uneven

## Analysis

THE PLT SAID THAT HE WAS ON A HIGH FINAL APPROACH FOR LANDING AND JUST PRIOR TO TOUCHDOWN, THE ACFT WAS HIT BY A STRONG GUST OF WIND. AFTER TOUCHDOWN, THE PLT LOST CONTROL OF THE ACFT AND IT WENT OFF THE LEFT SIDE OF THE RWY. THE ACFT SUSTAINED SUBSTANTIAL DAMAGE.

## Aircraft

- Registration: [N34043](https://openairdocs.org/aircraft/N34043), registered now, S/N 17701611, built 1970 (OpenAirDocs)
- Reported make and model: CESSNA 177B
- Registry model: [Cessna 177B](https://openairdocs.org/model/cessna-177b) (registry code 2073708) (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: 17701611
- Airframe hours: 2600
- Engines: LYCOMING IO-360-A1F6 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Robert A. Sonntag
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, June 30, 1986, 60 hours before
- Departed: OGD, OGDEN, UT
- Destination: BJC, BROOMFIELD, CO
- Airport: BJC, Jeffco, runway 11L, 7,498 × 100 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 46; private; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 184 total, 184 in this make and model, 153 as pilot in command, 17 in the last 90 days, 8 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 90° at 12 knots
- Visibility: 40 statute miles
- Lowest ceiling: none
- Temperature: 95 °F, dew point 45 °F
- Altimeter: 30.00 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 19860818040619A](https://openairdocs.org/incident/19860818040619A), Aug 18, 1986: Cessna 177B, Broomfield, CO, Substantial damage. The aircraft departed the side of the runway during landing roll. The pilot noted he needed more crosswind practice

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.