SEA98LA189

NTSB accident investigation · Cessna 172D · Ronan, MT · September 29, 1998

Accident · No injuriesLimited investigationFinal report
Date
September 29, 1998, 17:00 local (23:00 UTC)
Place
Ronan, MT
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N2479YCessna 172D
Weather
Visual (VMC) · Day
Status
Completed · report January 11, 2000
Report
Approved by Office Director
Case key
44063

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 attain adequate airspeed during liftoff from a soft field takeoff. Factors include high density alttiude.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Loss of control - in flightTakeoff - roll/run
Terrain condition - grass
Weather condition - high density altitudeFactor
Airspeed - not attainedPilot in commandCause
On ground/water collision with objectTakeoff - roll/run

Analysis

The pilot reported that while attempting to execute a soft field takeoff on a private, non-identified, turf airstrip, he pulled the aircraft's nose up prematurely. The aircraft then settled back to the surface and the pilot allowed the aircraft to accelerate before pulling the nose up a second time. On this occasion, all three wheels left the surface. Immediately thereafter, while still in ground effect, the aircraft veered left off of the takeoff surface. The pilot reported that he could not maintain directional control, and the aircraft went through a barbed-wire fence, striking several fence posts in the process. Density altitude at the closest weather reporting station was approximately 4,792 feet.

Factual narrative

On September 29, 1998, approximately 1700 mountain daylight time, a Cessna 172D, N2479Y, registered to and being flown by a private pilot, was substantially damaged during a loss of control while on the initial takeoff roll at a private, non-identified, turf airstrip near Ronan, Montana. The pilot and his wife were uninjured. Visual meteorological conditions existed and no flight plan had been filed. The flight, which was personal, was to have been operated under 14CFR91, and was destined for Spangle, Washington.

The pilot reported that while attempting to execute a soft field takeoff to the south on the turf airstrip, he pulled the aircraft's nose up prematurely. The aircraft then settled back to the surface and the pilot allowed the aircraft to accelerate before pulling the nose up a second time. On this occasion, all three wheels left the surface. Immediately thereafter, while still in ground effect, the aircraft veered left off of the takeoff surface. The pilot reported that he could not maintain directional control, and the aircraft went through a barbed-wire fence, striking several fence posts in the process. Density altitude was approximately 4,792 feet at Missoula, Montana, 40 nautical miles south.

In his written response, the pilot recommended that instructors should teach students how to or when to abort bad takeoffs, and to be more aware of those procedures. He stated that he only had one or two seconds to make the decision, and he "made the wrong one."

Aircraft

Registration
N2479Y
Reported as
Cessna 172D
Category
Airplane
Serial number
17249779
Airframe hours
2,250
Engine
Continental O-300C, 145 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Beard, Harvey, A.
Airworthiness certificate
Standard, Normal
Last inspection
Annual · May 22, 1998 · 10 hours before
Destination
Spangle, WA
Airport
Baer'S Airstrip

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
53
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
217 total · 59 in this make and model · 157 as pilot in command · 8 in the last 90 days · 8 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
Variable at 5 knots
Visibility
10 statute miles
Temperature
73 °F, dew point 37 °F
Altimeter
30.00 inHg
Observed at
MSO, 40 nm away