# NTSB DEN83LA109: Beech C-50, N322V, Nephi, UT, May 6, 1983

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: May 5, 1983, 22:08 local (May 6, 1983, 05:08 UTC)
- Place: Nephi, UT
- Coordinates: 39.680229, -111.830871 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.6802&lon=-111.8309&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor, 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16073
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN83LA109
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16073/pdf
- Page: https://openairdocs.org/ntsb/DEN83LA109

## Sequence of events

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

- Loss of engine power(total) - nonmechanical, cruise - normal
  - weather condition - carburetor icing conditions (contributing factor)
  - procedures/directives - improper, pilot in command (cause)
  - weather condition - icing conditions (contributing factor)
  - weather evaluation - inaccurate, pilot in command (cause)
  - performance data - not understood, pilot in command (cause)
  - preflight briefing service - disregarded, pilot in command (cause)
  - flight into known adverse weather - performed, pilot in command (cause)
- Forced landing, landing - flare/touchdown
  - terrain condition - high vegetation (contributing factor)

## Analysis

THE ACFT COLLIDED WITH ROCKS AND SAGEBRUSH DURING A FORCED LANDING AFTER THE ENGINE LOST POWER. THE ACFT ENCOUNTERED INDUCTION AND AIRFRAME ICING DURING CRUISE. THE PILOTS WEATHER BRIEFING FORECAST THE ICING WHICH HE ENCOUNTERED. THE BRIEFING TOOK PLACE ABOUT 12 HOURS BEFORE DEPARTURE. THERE IS NO RECORD OF ANOTHER BRIEFING PRIOR TO DEPARTURE. WHEN THEPILOT EXPERIENCED A REDUCTION IN MANIFOLD PRESSURE DURING CRUISE IN ICING CONDITIONS HE SUSPECTED INDUCTION ICING. THE ALTERNATE AIR DOORS WERE FROZEN. WHEN THE PILOT FREED THEM THERE WAS A SMALL BANGING SOUND IN THE ENGINES. HE RADIOED THE ARTCC AT SALT LAKE CITY THE HE HAD ICING AND WAS 'DROPPING LIKE A ROCK'. AN EMERGENCY LANDING WAS MADE IN A SAGE BRUSH CLEARING. THE PILOT SAID THE ACFT MANUAL SHOULD BE CHANGED. 'IT STATES THAT CARB ICE IS RARE AND IS CORRECTED BY ALTERNATE AIR. IT DOES NOT INDICATE THAT AFTER THE ICE FORMS IT IS TOO LATE TO RESTORE POWER'.

## Aircraft

- Registration: N322V (not matched to a registry record)
- Reported make and model: BEECH C-50
- Category: Airplane
- Serial number: CH-157
- Airframe hours: 3800
- Engines: LYCOMING GO-480-F1A6 275 horsepower reciprocating
- Damage: Substantial damage
- Flight: Business, Part 91
- Registered owner: Michael S. Robinson
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, March 5, 1983
- Departed: LAS, LAS VEGAS, NV
- Destination: SLC, SALT LAKE CITY, UT
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 35; private; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 1,440 total, 65 in this make and model, 1,144 as pilot in command, 65 in the last 90 days

## Weather

- Conditions: Instrument (IMC), Night/dark
- Wind: calm
- Lowest ceiling: 50 ft overcast
- Temperature: 37 °F, dew point 37 °F
- Altimeter: 29.00 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 19830506017929A](https://openairdocs.org/incident/19830506017929A), May 6, 1983: Beech C50, Nephi, UT, Substantial damage. Lost both engines due to induction icing. Had failed to timely use alternate air prior to entering icing conditions

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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