# NTSB DEN82DA160: Cessna 421C, N6771C, Bountiful, UT, August 10, 1982

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: August 9, 1982, 19:00 local (Aug 10, 1982, 01:00 UTC)
- Place: Bountiful, UT
- Coordinates: 40.880241, -111.819389 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.8802&lon=-111.8194&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report August 9, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 70013
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN82DA160
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/70013/pdf
- Page: https://openairdocs.org/ntsb/DEN82DA160

## Sequence of events

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

- Airframe/component/system failure/malfunction, landing - flare/touchdown
  - landing gear,normal brake system - loose (cause)
  - landing gear,normal brake system - locked (cause)
- Loss of control - on ground/water, landing - roll
  - directional control - not possible, pilot in command
  - ground loop/swerve - uncontrolled, pilot in command
- Main gear collapsed, landing - roll
  - landing gear,main gear - overload

## Analysis

THE PILOT REPORTED THAT THE APPROACH AND LANDING TO TOUCHDOWN WERE NORMAL. AT TOUCHDOWN, THE AIRCRAFT SHUTTERED AND PULLED TO THE RIGHT, BUT WAS KEPT ON THE RUNWAY THROUGH THE USE OF LEFT BRAKE AND NOSEWHEEL STEERING. AFTER CONTINUING DOWN THE RUNWAY FOR ABOUT 1500 FT, THE AIRCRAFT SLOWED TO APPROXIMATELY 10 MPH, THEN YAWED VIOLENTLY TO THE RIGHT AND SKIDDED WITH THE LEFT WING FORWARD. THE LEFT MAIN GEAR COLLAPSED AS THE AIRCRAFT CAME TO A HALT. WHEN EXAMINED, THE RIGHT WHEEL WOULD ROTATE SLOWER THAN THE LEFT WHEN BOTH WERE ROTATED TOGETHER, BUT NEITHER LOCKED UP. WHILE THE RIGHT WHEEL WAS BEING TURNED, A BRAKE PUCK FELL OUT OF THE BRAKE ASSEMBLY. A DISASSEMBLY OF THE BRAKE REVEALED A SECOND PUCK WAS ALSO LOOSE. AFTER REASSEMBLY, THE RIGHT BRAKE OPERATED NORMALLY.

## Aircraft

- Registration: N6771C (not matched to a registry record)
- Reported make and model: CESSNA 421C
- Category: Airplane
- Serial number: 421C0455
- Airframe hours: 417
- Engines: CONTINENTAL GTSIO-520-L 375 horsepower reciprocating
- Damage: Substantial damage
- Flight: Business, Part 91
- Operator: Hoskings Exploration Helicopte
- Registered owner: Hoskings Exploration Helicopte
- Departed: 6V6, NUCLA, CO
- Destination: HOUSTON, TX
- Flight plan: VFR
- Airport: BTF, Salt Lake Skypark, runway 34, 4,700 × 70 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 31; commercial, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; flight hours: 2,373 total, 467 in this make and model, 2,063 as pilot in command, 68 in the last 90 days, 66 in the last 30 days, 10 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 30° at 10 knots
- Visibility: 40 statute miles
- Temperature: 194 °F
- Altimeter: 30.00 inHg
- Observed at: SLC, 5 nm away

## 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 19820810035399A](https://openairdocs.org/incident/19820810035399A), Aug 10, 1982: Cessna 421C, Bountiful, UT, Substantial damage. Pilot stated aircraft shuddered and right brake jammed, swerving it to the right causing left gear to collapse.

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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