WPR10CA279

NTSB accident investigation · Cessna 172H · Bountiful, UT · June 5, 2010

Accident · Minor injuriesData collectionFinal report
Date
June 5, 2010, 10:45 local (16:45 UTC)
Place
Bountiful, UT
Injuries
1 minor, 1 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N3948RCessna 172H
Defining event
Enroute: Low altitude operation/event
Weather
Visual (VMC) · Day
Status
Completed · report July 22, 2010
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
Federal Aviation Administration
FAA report
20100605036219A
Case key
76219

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

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Probable cause

The pilot’s failure to maintain clearance from terrain. Contributing to the accident was the high density altitude.

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.

Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedCessna 172H: 5 casesAll aircraft: 1,681 casesProbable cause
Performance/control parameters: altitudeAircraft › Aircraft oper/perf/capability · Not attained/maintainedCessna 172H: 4 casesAll aircraft: 1,310 casesProbable cause
Temp/humidity/pressure: high density altitudeEnvironmental issues › Conditions/weather/phenomena · Effect on equipmentCessna 172H: 1 caseAll aircraft: 278 casesProbable cause

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 reported that she was flying into a canyon at 6,100 feet with the intent to climb through it and over the surrounding terrain. During the ascent the airplane started to lose airspeed and altitude. She attempted to turn around, but she felt that the airplane would stall due to an insufficient amount of airspeed and she abandoned the attempt. The pilot initiated a forced landing into trees at the bottom of a ravine and the airplane received substantial damage to the wings, fuselage and empennage. The calculated density altitude for the existing atmospheric conditions was 8,238 feet. The published maximum operating altitude for the airplane is 13,100 feet. The pilot reported no mechanical failures or malfunctions with the airframe or engine at the time of the accident. The pilot stated the accident could have been prevented by acquiring enough altitude prior to entering the canyon.

Factual narrative

In a written statement, the pilot reported flying into a canyon at 6,100 feet with the intent to fly over it. During the ascent the airplane started to lose airspeed and altitude. The pilot attempted to turn around, however, could not because the airplane would stall due to an insufficient amount of airspeed. The pilot initiated a forced landing into trees at the bottom of a ravine; subsequently, the airplane received substantial damage to the wings, fuselage and empennage. The pilot reported no mechanical failures or malfunctions with the airframe or engine at the time of the accident. The calculated density altitude for the conditions at 6,100 feet, altimeter setting 30.14, and temperature of 22 Degrees Celsius, is 8,238 feet. The published maximum operating density altitude for the C-172H is 13,100 feet. In a written statement, the pilot stated that the accident could have been prevented by circling over a nearby city until enough altitude was acquired to fly over the canyon.

Aircraft

Registration
N3948R
Reported as
Cessna 172H (H)
Category
Airplane
Serial number
17255448
Airframe hours
3,003
Engine
Continental O-300, 145 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Amberdawn Mock
Registered owner
Herbert Biesinger
Airworthiness certificate
Standard, Normal
Last inspection
Annual · April 16, 2010 · 8 hours before
Departed
KBTF · Bountiful, UT
Destination
KBTF · Bountiful, UT
Airport
KBTF · Skypark Airport

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
20
Injuries
Minor
Certificate
Private
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 1, Without waivers/limitations
Last flight review
October 21, 2009
Seat
Left
Flight hours
155 total · 64 in this make and model · 120 as pilot in command · 1 in the last 90 days · 1 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
340° at 5 knots
Visibility
10 statute miles
Lowest ceiling
20,000 ft broken
Temperature
72 °F, dew point 54 °F
Altimeter
30.13 inHg
Observed at
SLC, 8 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.