# NTSB LAX91FA117: Beech 58P, N6666Q, Green Valley, CA, March 2, 1991

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Field investigation · Final report
- Date: March 1, 1991, 16:40 local (Mar 2, 1991, 00:40 UTC)
- Place: Green Valley, CA
- Coordinates: 34.240909, -117.070846 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=34.2409&lon=-117.0708&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed, report May 27, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 26984
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX91FA117
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/26984/pdf
- Page: https://openairdocs.org/ntsb/LAX91FA117

## Probable cause

THE PILOT'S LOSS OF AIRCRAFT CONTROL DUE TO HIS DISREGARD FOR AND POOR EVALUATION OF SIGNIFICANT WEATHER ADVISORIES FORECASTING ADVERSE WEATHER CONDITIONS ALONG THE ROUTE OF FLIGHT AND THE PILOT'S DECISION TO INITIATE THE FLIGHT.

## Sequence of events

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

- In flight encounter with weather, cruise
  - weather condition - turbulence (contributing factor)
  - hazardous weather advisory - disregarded, pilot in command (cause)
  - weather condition - icing conditions (contributing factor)
  - weather evaluation - poor, pilot in command (cause)
  - weather condition - high wind (contributing factor)
  - planning/decision - poor, pilot in command (cause)
  - weather condition - clouds (contributing factor)
- Loss of control - in flight, cruise
  - weather condition - turbulence (contributing factor)
  - flight into known adverse weather - performed, pilot in command (cause)
  - weather condition - icing conditions (contributing factor)
  - weather condition - high wind (contributing factor)
  - weather condition - clouds (contributing factor)
- In flight collision with terrain/water, descent - uncontrolled
  - terrain condition - high terrain

## Analysis

A BEECH 58P DESCENDED AND COLLIDED WITH MOUNTAINOUS TERRAIN WHILE IN INSTRUMENT METEOROLOGICAL CONDITIONS.  THE PILOT WAS ISSUED A 20 MINUTE WEATHER BRIEFING FROM A FLIGHT SERVICE STATION.  THE WEATHER BRIEFING FORECASTED IFR CEILINGS ALONG ENTIRE FLIGHT, OCCASIONAL MODERATE TURBULENCE OVER THE ENTIRE ROUTE, A SIGMET FOR SEVERE TURBULENCE AND LOW LEVEL WIND SHEAR, STRONG UP AND DOWN DRAFTS IN THE VICINITY OF MOUNTAINS AND PASSES, AND OCCASIONAL MODERATE MIXED ICING FROM THE FREEZING LEVEL TO FLIGHT LEVEL 200 OVER ENTIRE ROUTE OF FLIGHT.  AFTER RECEIVING THE BRIEFING, THE PILOT DECIDED TO INITIATE THE FLIGHT AND FILED AN IFR FLIGHT PLAN.  THE AIRPLANE WAS OBSERVED ON RADAR CLIMBING THROUGH 11,400 FEET MSL AT A POSITION THAT OVERLIES AN 8,000 FOOT MSL MOUNTAIN RANGE.  RADIO AND RADAR CONTACT WAS THEN LOST. NO MECHANICAL PROBLEMS WERE FOUND.

## Aircraft

- Registration: [N6666Q](https://openairdocs.org/deregistered/N6666Q-2014-10-31), registration cancelled 2014-10-31, S/N TJ-268, built 1980 (OpenAirDocs)
- Reported make and model: BEECH 58P
- Registry model: [Beech 58P](https://openairdocs.org/model/beech-58p) (registry code 1152744) (OpenAirDocs)
- Registry engine: [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series) (registry code 17040, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: TJ 268
- Engines: CONTINENTAL TSIO-520-WB 325 horsepower reciprocating
- Damage: Destroyed
- Flight: Business, Part 91
- Operator: John G. Krisch
- Registered owner: John G. Krisch
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, February 23, 1990, 232 hours before
- Departed: SNA, SANTA ANA, CA
- Destination: RNO, RENO, NV
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 49; private; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; toxicology performed; flight hours: 1,073 total, 136 in this make and model, 983 as pilot in command, 0.5 in the last 24 hours

## Weather

- Conditions: Instrument (IMC), Day
- Wind: 260° at 5 knots
- Visibility: 15 statute miles
- Lowest ceiling: 2,400 ft broken
- Temperature: 55 °F, dew point 52 °F
- Altimeter: 29.00 inHg
- Observed at: SBD, 13 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 19910301003729A](https://openairdocs.org/incident/19910301003729A), Mar 1, 1991: Beech 58P, Green Vallley, CA, Destroyed, 1 fatal. Impacted mountain side near vertically. Severe thunderstorm in area. SIGMET out for severe turbulence and icing.

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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