WPR12LA231

NTSB accident investigation · Cessna 172G · Silver City, ID · May 27, 2012

Accident · Minor injuriesLimited investigationFinal report
Date
May 26, 2012, 21:50 local (May 27, 2012, 03:50 UTC)
Place
Silver City, ID
Injuries
3 minor
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N4640LCessna 172G
Defining event
Maneuvering: Aerodynamic stall/spin
Weather
Visual (VMC) · Dusk
Status
Completed · report September 5, 2013
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
FAA FSDO
FAA report
20120526008899A
Case key
83760

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 failure to maintain airspeed while maneuvering in mountainous terrain with reduced visibility, which resulted in an aerodynamic stall.

Findings · 4

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/infoPersonnel issues › Task performance · PilotCessna 172G: 1 caseAll aircraft: 111 casesProbable cause
Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedCessna 172G: 3 casesAll aircraft: 1,681 casesProbable cause
Ceiling/visibility/precip: low visibilityEnvironmental issues › Conditions/weather/phenomena · Effect on operationCessna 172G: 2 casesAll aircraft: 175 cases
Terrain: mountainous/hilly terrainEnvironmental issues › Physical environment · Effect on operationCessna 172G: 2 casesAll aircraft: 329 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

The pilot stated that he was maneuvering over mountainous terrain in deteriorating weather conditions and reduced visibility when the airplane stalled. He pushed the nose down to recover from the aerodynamic stall and then abruptly pitched the nose up to avoid oncoming rising terrain. The airplane subsequently impacted trees and settled to the ground. The pilot reported no preimpact mechanical malfunctions or failures that would have precluded normal operation.

Factual narrative

On May 26, 2012, about 2150 mountain daylight time, a Cessna 172G, N4640L, collided with mountainous terrain while maneuvering about five miles southeast of Silver City, Idaho. The private pilot and two passengers received minor injuries. The airplane sustained substantial damage to the fuselage, wings and flight control surfaces. The airplane was registered to the pilot, and operated as a personal flight under the provisions of 14 Code of Federal Regulations Part 91. Marginal visual meteorological conditions prevailed and dusk light prevailed. No flight plan was filed for the cross-county flight. The flight originated from Rome, Oregon (REO), about 1930. The pilot’s intended destination was Mountain Home, Idaho (U76). The pilot reported that the accident flight was the third flight leg of the day. Earlier in the day he flew with his passengers from Lodi, California, to Susanville, California. About 1400 the pilot departed Susanville with a planned destination of Mountain Home, Idaho. About 1 hour after departing Susanville, the pilot “turned back” due to deteriorating weather conditions and diverted to Rome, Oregon. The pilot landed in Rome uneventfully. Initially, the pilot and passengers planned to overnight in Rome; however, weather conditions improved and the pilot again departed for Mountain Home. As the flight progressed over mountainous terrain (Owyhee Mountains) weather conditions deteriorated and the pilot encountered reduced flight visibility, broken clouds and precipitation; a passenger reported the flight visibility dropped to “zero.” While maneuvering over a ridgeline and nearby weather, the pilot stated the airplane "stalled." He pushed the nose down to “break” the aerodynamic stall and then pitched up abruptly to match approaching rising terrain. The airplane subsequently impacted trees and settled to the ground. Initial rescue efforts were delayed due to snow showers and poor visibility. On May 28, search and rescue personnel reached the accident site and airlifted the pilot and passengers to a regional medical facility in Boise, Idaho. The pilot reported no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.

Aircraft

Registration
N4640L
Reported as
Cessna 172G
Category
Airplane
Serial number
17254635
Airframe hours
3,589
Engine
Cont Motor O-300 SER, 145 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Brown, Brian
Registered owner
Brown Jayann
Airworthiness certificate
Standard, Utility; Standard, Normal
Last inspection
Annual · November 4, 2011
Departed
KREO · Rome, OR
Destination
U76 · Mountain Home, ID

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
47
Injuries
Minor
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Without waivers/limitations
Seat
Left
Flight hours
402 total · 308 in this make and model · 400 as pilot in command

Weather

Conditions
Visual (VMC) · Dusk
Visibility
20 statute miles

Docket · 3

The files NTSB released with the investigation on June 25, 2013, on NTSB’s docket system: statements, records, photos and specialists’ reports. 369 KB 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.