# NTSB DEN85LA244: Cessna 425, N1222B, Boulder, CO, September 19, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: September 19, 1985, 17:00 local (23:00 UTC)
- Place: Boulder, CO
- Coordinates: 40.019077, -105.250663 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.0191&lon=-105.2507&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16764
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN85LA244
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16764/pdf
- Page: https://openairdocs.org/ntsb/DEN85LA244

## Sequence of events

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

- Airframe/component/system failure/malfunction, landing - roll
  - landing gear,normal brake system - failure,partial (cause)
- Overrun, landing - roll
  - propeller feathering - attempted, pilot in command (contributing factor)
- On ground/water collision with object, landing - roll
  - object - fence (contributing factor)

## Analysis

THE PLT SAID HE MADE A NORMAL LDG. DURING LDG ROLL THE LEFT BRAKE WOULD NOT RESPOND TO PEDAL APPLICATION. THE PLT ERRORED BY INCORRECTLY FEATHERING BOTH PROPS. THE A/C WENT OFF THE ENG OF R/W AND STRUCK A FENCE. EXAMINATION OF THE BRAKE SYSTEM REVEALED A BRAKE PUCK WAS MISSING. A MISSING PUCK WOULD CAUSE POOR BRAKING ACTION.

## Aircraft

- Registration: [N1222B](https://openairdocs.org/aircraft/N1222B), registered now, S/N 425-0060, built 1980 (OpenAirDocs)
- Reported make and model: CESSNA 425
- Registry model: [Cessna 425](https://openairdocs.org/model/cessna-425) (registry code 2076018) (OpenAirDocs)
- Registry engine: [Pratt & Whitney PT6A series](https://openairdocs.org/engine/pratt-whitney-pt6a-series) (registry code 52032, turbo-prop) (OpenAirDocs)
- Category: Airplane
- Serial number: 425-0060
- Airframe hours: 916
- Engines: P&W TT6A-112A 450 horsepower turbo prop
- Damage: Substantial damage
- Flight: Business, Part 91
- Registered owner: Reid W. Dennis
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, September 17, 1985, 8 hours before
- Departed: BJC, DENVER, CO
- Destination: 1V5, BOULDER, CO
- Airport: IV5, Boulder Municipal

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 59; private; airplane ratings: multi-engine land, single-engine land, multi-engine sea, single-engine sea; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 4,345 total, 716 in this make and model, 4,255 as pilot in command, 91 in the last 90 days, 5 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 5 knots
- Visibility: 60 statute miles
- Lowest ceiling: none
- Temperature: 73 °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 19850919045699A](https://openairdocs.org/incident/19850919045699A), Sep 19, 1985: Cessna 425, Boulder, CO, Substantial damage. Feathered propellers on rollout. Ran through fence into ditch when brake failed due to missing puck.

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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