# NTSB DEN86LA090: Cessna 180J, N9923N, Casper, WY, March 3, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: March 3, 1986, 11:30 local (18:30 UTC)
- Place: Casper, WY
- Coordinates: 42.830799, -106.320541 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=42.8308&lon=-106.3205&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16930
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN86LA090
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16930/pdf
- Page: https://openairdocs.org/ntsb/DEN86LA090

## Sequence of events

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

- Loss of control - on ground/water, landing
  - landing gear,normal brake system - failure,partial (cause)
  - ground loop/swerve - inadvertent, pilot in command

## Analysis

ACCORDING TO THE FLT INSTRUCTOR, DURING THE TOUCH AND GO LANDING, DIRECTIONAL CONTROL WAS LOST WHEN BRAKES WERE APPLIED AND THE ACFT GROUND LOOPED. DURING THE INVESTIGATION, IT WAS ASCERTAINED THAT AN 'O' RING ON THE RIGHT WHEEL HAD DISLODGED, RESULTING IN ASYMMETRICAL BRAKING.

## Aircraft

- Registration: [N9923N](https://openairdocs.org/aircraft/N9923N), registered now, S/N 18052578 (OpenAirDocs)
- Reported make and model: CESSNA 180J
- Registry model: [Cessna 180J](https://openairdocs.org/model/cessna-180j) (registry code 2072622) (OpenAirDocs)
- Registry engine: [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series) (registry code 17026, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 18052578
- Airframe hours: 1325
- Engines: CONTINENTAL O-470-S 235 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Operator: Willard Mcmillen
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, March 20, 1985, 26 hours before
- Airport: CPR, Natrona Co. Int. Airport, runway 21, 10,600 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 38; airline transport, commercial; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: right; flight hours: 1,672 total, 736 in this make and model, 1,404 as pilot in command, 72 in the last 90 days, 72 in the last 30 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 210° at 5 knots
- Visibility: 60 statute miles
- Lowest ceiling: none
- Temperature: 39 °F
- Altimeter: 30.00 inHg

## 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 19860303005279A](https://openairdocs.org/incident/19860303005279A), Mar 3, 1986: Cessna 180J, Casper, WY, Substantial damage. Groundlooped on the landing roll when the right brake failed. The brake cylinder o ring was dislodged.

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.