# NTSB DEN86LA222: Boeing E75, N1387V, Tooele, UT, August 7, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: August 7, 1986, 16:00 local (22:00 UTC)
- Place: Tooele, UT
- Coordinates: 40.570278, -112.329513 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.5703&lon=-112.3295&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 17029
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN86LA222
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/17029/pdf
- Page: https://openairdocs.org/ntsb/DEN86LA222

## Sequence of events

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

- In flight collision with terrain/water, cruise
  - in-flight planning/decision - improper, pilot in command (cause)
  - weather condition - high density altitude (contributing factor)
  - weather condition - downdraft (contributing factor)
  - terrain condition - mountainous/hilly (contributing factor)
  - terrain condition - rising (contributing factor)

## Analysis

THE PLT RPRTD THAT HE ENCOUNTERED A DOWNDRAFT WHILE CROSSING A RIDGELINE IN MOUNTAINOUS TERRAIN, APRX 5 MI NE OF TOOELE,UT. THE ELEV OF THE ACDNT SITE WAS ABOUT 9,000 FT & THE TEMP WAS RPRTD BY THE PLT TO BE 80 DEG. THIS WOULD HAVE RESULTEDIN A DENSITY ALT OF ABOUT 12,500 FT. THE PLT SAID HE SHOULD HAVE SELECTED A ROUTE AROUND THE MOUNTAINS.

## Aircraft

- Registration: [N1387V](https://openairdocs.org/aircraft/N1387V), registered now, S/N 75-8291, built 1945 (OpenAirDocs)
- Reported make and model: BOEING E75
- Registry model: [Boeing E75](https://openairdocs.org/model/boeing-e75) (registry code 1380120) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 75-8291
- Airframe hours: 5765
- Engines: P&W R-985 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: William C. Dause, Jr.
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Annual, May 6, 1986
- Departed: U42, SALT LAKE CITY, UT
- Destination: EKO, ELKO, NV

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; commercial; airplane ratings: single-engine land, multi-engine land, single-engine sea; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: rear; flight hours: 4,200 total, 20 in this make and model, 4,100 as pilot in command, 45 in the last 90 days, 10 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 340° at 12 knots
- Visibility: 40 statute miles
- Lowest ceiling: 11,000 ft broken
- Temperature: 90 °F, dew point 48 °F
- Altimeter: 30.00 inHg
- Observed at: SLC, 16 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 19860807037829A](https://openairdocs.org/incident/19860807037829A), Aug 7, 1986: Boeing E75, Tooele, UT, Substantial damage. The aircraft failed to clear a ridgeline and struck trees. Pilot reported downdraft conditions. Altitude a factor.

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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