WPR13LA307

NTSB accident investigation · Boson RV-4 · Hurricane, UT · July 3, 2013

Accident · Serious injuriesLimited investigationFinal report
Date
July 3, 2013, 17:15 local (23:15 UTC)
Place
Hurricane, UT
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N220CPBoson RV-4
Defining event
Landing-landing roll: Runway excursion
Weather
Visual (VMC) · Day
Status
Completed · report July 30, 2014
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
Federal Aviation Administration
FAA report
20130703011789A
Case key
87386

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

The pilot’s incorrect approach/descent path with a tailwind, which resulted in a long landing at an excessive groundspeed and a subsequent runway excursion.

Findings · 5

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotBoson Charles P RV-4: 1 caseAll aircraft: 9,295 casesProbable cause
Wind: tailwindEnvironmental issues › Conditions/weather/phenomena · Effect on equipmentBoson Charles P RV-4: 1 caseAll aircraft: 594 cases
Performance/control parameters: surface speed/brakingAircraft › Aircraft oper/perf/capability · Incorrect use/operationBoson Charles P RV-4: 1 caseAll aircraft: 238 casesProbable cause
Performance/control parameters: descent/approach/glide pathAircraft › Aircraft oper/perf/capability · Not attained/maintainedBoson Charles P RV-4: 1 caseAll aircraft: 809 casesProbable cause
Terrain: sloped/uneven terrainEnvironmental issues › Physical environment · Contributed to outcomeBoson Charles P RV-4: 1 caseAll aircraft: 270 cases

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

During the landing with a tailwind, the airplane departed the runway and came to rest in a ravine about 100 yards from the departure end of the runway. The pilot did not recall the circumstances leading to the accident. Two witnesses reported that the airplane landed long. One witness further stated that the engine sounded normal and that the airplane was moving at a high rate of speed after touchdown. Postaccident examination of the airplane and engine revealed no evidence of mechanical malfunctions or failures that would have precluded normal operation.

Factual narrative

On July 3, 2013, about 1715 mountain daylight time, an experimental amateur built Boson, RV-4, N220CP, sustained substantial damage from a runway overrun during landing roll, at the General Dick Stout Field Airport (1L8) Hurricane, Utah. The airplane was registered to and operated by the pilot under the provisions of Title 14 Code of Federal Regulations Part 91. The private pilot was seriously injured. Visual meteorological conditions prevailed and no flight plan was filed for the personal flight which originated from Cedar City Regional Airport (CDC) Cedar City, Utah, about 1630, with a destination of 1L8. In a written statement to the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) the pilot reported that he did not recall the circumstances of the accident. Two witnesses located near the airport runway reported that the airplane landed long and then departed the runway surface at the end of runway 19. The airplane came to rest in a ravine about 100 yards from the departure end of the runway. One witness stated that the airplane's engine noise was normal and the airplane was moving at a high rate of speed upon landing. Examination of the accident site was conducted by a Federal Aviation Administration inspector, who was able to obtain flight control and engine continuity and reported no anomalies. The airplane's fuselage and wings sustained substantial damage. A review of recorded weather data from the CDC automated weather observation station revealed at 1653 conditions were wind 320 degrees at 8 knots. Postaccident examination of the airplane and engine was conducted by a certified airframe and powerplant mechanic, under the supervision of the NTSB IIC investigator-in-charge. Flight control continuity was established throughout all primary flight control surfaces from the cockpit controls. Braking continuity was established and the brakes and tires were unremarkable. An engine run was accomplished using an external fuel source that was connected directly to the carburetor fuel port. An external battery was used to start the engine. The engine functioned normally throughout a various range of power settings and no anomalies were noted. The examination of the airplane and engine revealed no evidence of mechanical anomalies or failures that would have precluded normal operation. For additional information, see the Airframe and Engine Examination Report in the Public docket.

Aircraft

Registration
N220CP
Reported as
Boson RV-4
Category
Airplane, amateur-built
Serial number
2214
Built
1993
Engine
Lycoming O-320 SERIES, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Spey John R Major Usaf (Ret)
Registered owner
Spey John R Major Usaf (Ret)
Airworthiness certificate
Special, Experimental (Special)
Departed
CDC · Cedar City, UT
Destination
1L8 · Hurricane, UT
Airport
1L8 · General Dick Stout Field, runway 19, 3,282 × 40 ft, asphalt

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
74
Injuries
Serious
Certificates
Private, Military
Airplane ratings
Single-engine land
Medical
Class 3, Without waivers/limitations
Seat
Front
Restraint
3-point
Flight hours
6,800 total

Weather

Conditions
Visual (VMC) · Day
Wind
320° at 8 knots
Visibility
10 statute miles
Temperature
99 °F, dew point 28 °F
Altimeter
30.01 inHg
Observed at
CDC, 35 nm away

Docket · 8

The files NTSB released with the investigation on June 5, 2014, on NTSB’s docket system: statements, records, photos and specialists’ reports. 2.8 MB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.