DEN04LA051

NTSB accident investigation · Shook Rans S-12 · Berthoud, CO · March 8, 2004

Accident · No injuriesLimited investigationFinal report
Date
March 7, 2004, 17:15 local (Mar 8, 2004, 00:15 UTC)
Place
Berthoud, CO
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N7138KShook Rans S-12
Weather
Visual (VMC) · Day
Status
Completed · report September 29, 2004
Report
Approved by Office Director
Parties
FAA FSDO
FAA report
20040307003239A
Case key
58872

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 improper flare and his inadequate compensation for wind. The wind gust was a contributing factor.

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.

Hard landingLanding - flare/touchdown
Compensation for wind conditions - inadequatePilot in commandCause
Weather condition - gustsFactor
Flare - improperPilot in commandCause
Gear collapsedLanding - flare/touchdown
Aircraft control - not maintainedPilot in commandCause
Stall/mush - inadvertentPilot in commandFactor

Analysis

According to the pilot, he had entered a left downwind traffic pattern for the east/west runway, intending to land to the east. He "checked the wind sock and it was just fluttering with a very slight, if at all, crosswind... from the north." During the landing flare, he encountered a gust of wind from the north and the airplane stalled approximately 10 feet above the ground. The airplane bounced once and during the second impact with the ground, all three landing gear collapsed, substantially damaging the airplane. According to the FNL METAR (aviation routine weather report) taken at 1715, winds were reported as 150 degrees at 3 knots.

Factual narrative

On March 7, 2004, at approximately 1715 mountain standard time, a Shook Rans S-12, N7138K, was substantially damaged when the landing gear collapsed following collision with terrain at the Lazy W, a private airstrip near Berthoud, Colorado. The private pilot, the sole occupant on board, was not injured. Visual meteorological conditions prevailed. No flight plan had been filed for the local flight being conducted under the provisions of Title 14 CFR Part 91. The flight departed at approximately 1610.

According to the pilot, he was practicing landings at both the Lazy W airstrip and the Ft. Collins-Loveland Airport (FNL). (Lazy W is approximately 5 nautical miles southwest of FNL.) The pilot reported that he entered a left downwind traffic pattern for the east/west runway at Lazy W, intending to land to the east. He "checked the wind sock and it was just fluttering with a very slight, if at all, crosswind... from the north." During the landing flare, he encountered a gust of wind from the north and the airplane stalled approximately 10 feet above the ground. The airplane bounced once and during the second impact with the ground, all three landing gear collapsed, wrinkling the fuselage.

According to the FNL METAR (aviation routine weather report) taken at 1715, winds were reported as 150 degrees at 3 knots.

Aircraft

Registration
N7138K
Reported as
Shook Rans S-12
Category
Airplane, amateur-built
Serial number
1094523
Airframe hours
181.9
Engine
Rotax 618, 75 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Annual · September 12, 2003 · 34.6 hours before
Departed
Berthoud, CO
Destination
Berthoud, CO
Airport
PVT · Lazy W (Private strip), runway 090, 2,600 × 60 ft, grass/turf

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
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--no waivers/lim.
Last flight review
October 9, 2003
Seat
Left
Flight hours
130 total · 32 in this make and model · 130 as pilot in command · 17 in the last 90 days · 6 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
150° at 3 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
59 °F, dew point 23 °F
Altimeter
30.37 inHg
Observed at
FNL, 10 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.

Other investigations on N7138K · 1

Matched to the same aircraft by N-number and date.