# NTSB SEA92LA181: R.P. Williams Acro Sport II, N122RW, Herriman, UT, August 17, 1992

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Limited investigation · Final report
- Date: August 16, 1992, 19:30 local (Aug 17, 1992, 01:30 UTC)
- Place: Herriman, UT
- Coordinates: 40.500118, -111.940216 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.5001&lon=-111.9402&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 1 fatal
- Status: Completed, report August 31, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 42878
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA92LA181
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/42878/pdf
- Page: https://openairdocs.org/ntsb/SEA92LA181

## Probable cause

INADEQUATE REMEDIAL ACTION AND POOR INFLIGHT PLANNING/DECISION. A FACTOR TO THE ACCIDENT WAS: AN UNCONTROLLED STALL/SPIN.

## Sequence of events

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

- Loss of control - in flight, maneuvering
  - stall/spin - encountered, pilot in command (contributing factor)
  - remedial action - inadequate, pilot in command (cause)
  - in-flight planning/decision - poor, pilot in command (cause)
- In flight collision with terrain/water, descent - uncontrolled
  - terrain condition - loose gravel/sandy

## Analysis

WITNESSES REPORTED THAT THEY OBSERVED THE HOMEBUILT AIRPLANE PERFORMING AEROBATIC MANEUVERS IN THE AREA FOR APPROXIMATELY 15 MINUTES BEFORE THE ACCIDENT. THE AIRPLANE WAS AT APPROXIMATELY 500 FEET AGL WHEN IT ENTERED A SPIN. THE AIRPLANE DID NOT RECOVER BEFORE COLLIDING WITH THE TERRAIN IN A NOSE DOWN ATTITUDE.

## Aircraft

- Registration: [N122RW](https://openairdocs.org/deregistered/N122RW-1993-11-04), registration cancelled 1993-11-04, S/N 1074 (OpenAirDocs)
- Reported make and model: R.P. WILLIAMS ACRO SPORT II (ACRO SPORT)
- Registry model: [Williams R P / Williams R W ACRO SPORT II](https://openairdocs.org/model/williams-r-p-williams-r-w-acro-sport-ii) (registry code 05646FK) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 1074
- Airframe hours: 19
- Engines: LYCOMING IO-360 200 horsepower reciprocating
- Damage: Destroyed
- Flight: Personal, Part 91
- Operator: Williams, Robert & Rand
- Registered owner: Williams, Robert & Rand
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Unknown, May 12, 1992, 19 hours before
- Departed: U42, SALT LAKE CITY, UT

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 68; flight instructor, airline transport, commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; seat: front; toxicology performed; flight hours: 13,875 total, 15 in this make and model, 11,574 as pilot in command, 15 in the last 90 days, 4 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 350° at 11 knots
- Visibility: 30 statute miles
- Lowest ceiling: 25,000 ft broken
- Temperature: 84 °F, dew point 50 °F
- Altimeter: 30.00 inHg
- Observed at: SLC, 6 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 19920816031319A](https://openairdocs.org/incident/19920816031319A), Aug 16, 1992: Amtrea ACROSPORT, Herriman, UT, Destroyed, 1 fatal. Observed in acrobatics at low altitude. Entered spin 500 feet AGL. Did not recover.

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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