FTW00LA133

NTSB accident investigation · Lake LA-4-200 · Claremore, OK · April 28, 2000

Accident · Minor injuriesLimited investigationFinal report
Date
April 28, 2000, 15:15 local (20:15 UTC)
Place
Claremore, OK
Injuries
3 minor
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N5023LLake LA-4-200
Weather
Visual (VMC) · Day
Status
Completed · report July 17, 2001
Report
Approved by Office Director
Case key
49081

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 premature raising of the flaps.

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.

In flight collision with objectGo-around (vfr)
Go-around - delayedPilot in commandCause
Clearance - not maintainedPilot in commandCause
Object - fence
Object - tree(s)
Engine assembly,valve,intake - leak

Analysis

During the demonstration flight, the pilot-in-command (PIC)/airplane owner occupied the right front seat, and the prospective buyer occupied the left front seat. After circling the airport to confirm wind sock position and that the 2,400-foot grass runway was clear of obstructions, a pattern entry was made for landing to the south. On final approach, the pilots noted that the airplane was low on the approach, and the left seat pilot added power. Subsequently, the airplane was too far down the runway and the airspeed was too fast for the landing. The PIC called for a go-around, and the left seat pilot added full power. The airplane flew in ground effect, about 5 feet agl, for several hundred feet. Subsequently, the airplane climbed to about 20 feet agl, and the left seat pilot retracted the landing gear. The PIC raised the flaps, and the airplane settled to 5 to 10 feet agl and impacted a fence and trees. During a post accident compression check of the engine, the prospective buyer and his mechanic found that the #2 intake valve was leaking.

Factual narrative

On April 29, 2000, at 1515 central daylight time, a Lake LA-4-200, single-engine amphibian airplane, N5023L, struck a fence and trees during a go-around from a private grass airstrip near Claremore, Oklahoma. The airplane was owned and operated by a private individual under 14 Code of Federal Regulations Part 91. The two private pilots and the aft seat passenger received minor injuries, and the airplane sustained substantial damage. Visual meteorological conditions prevailed for the local personal flight, and a flight plan was not filed. The flight departed the Claremore Municipal Airport approximately 1445.

During the demonstration flight, the pilot-in-command/owner of the airplane occupied the right front seat, and the prospective buyer occupied the left front seat. After re-fueling at Claremore, the pilots flew over Lake Oolagah and then proceeded to the Avian Country Estates airstrip, a 2,400-foot grass airstrip near Claremore.

On the Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1/2), the left seat pilot reported the following information. Upon approaching the airport from the north, they circled the airport to confirm windsock position and that the runway was clear of obstructions. Subsequently, on final approach for runway 17, the pilots noted that the airplane was low on the approach, and the left seat pilot added power. The power was left on too long, the airplane traveled too far down the runway, and the airspeed was too fast for the landing. The pilot-in-command called for a go-around, and the left seat pilot added full power. The airplane flew in ground effect, about 5 feet above the runway, for several hundred feet. Subsequently, the airplane climbed to about 20 feet agl, and the left seat pilot retracted the landing gear. The pilot-in-command raised the flaps, and the airplane settled to 5 to 10 feet agl, traveled through trees, and continued traveling approximately 200 feet before it struck a tree and came to rest.

One witness observed the airplane touchdown and bounce. Subsequently, the witnesses observed the airplane slightly airborne until it hit [the] trees. One witness described the engine as "loud." Witnesses reported the winds were calm with the windsock "motionless."

According to the Pilot/Operator Report (NTSB Form 6120.1/2), the pilot-in-command had accumulated a total of 3,200 flight hours, of which 1,200 hours were in the make and model of the accident aircraft. The pilot/prospective buyer had accumulated a total of 1,105 flight hours, of which 10 hours were in the make and model.

Local authorities and the FAA inspector responding to the site found that the right wing struck a barbed wire fence and a tree. The FAA inspector stated that the tree "was broken off approximately 4 feet from the ground." The airplane came to rest inverted with the fuselage split aft of the front seats. The left main landing gear was found up and locked, the right main landing gear partially extended, and the nose landing gear in the wheel well with the gear doors half closed. The left flap was found in the retracted position, and the right flap was found separated at the outboard attachment points.

A review of the aircraft maintenance records by the FAA inspector revealed that the last annual inspection was performed on October 8, 1999, at an accumulated total aircraft time of 1,841.0 hours.

The operating procedures manual for the airplane states in part: All take-off and landings should be made flaps down.

On May 10, 2000, the prospective buyer and his mechanic examined the airplane. During a compression check, they found cylinder #2 compression at 20 psi. They removed the #2 cylinder and poured solvent into the intake ports for the valve assembly and observed solvent leaking into the cylinder.

Aircraft

Registration
N5023L
Reported as
Lake LA-4-200
Category
Airplane
Serial number
480
Airframe hours
1,870
Engine
Lycoming IO-360-A1B, 200 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Kenneth L. Clark
Registered owner
Thomas L. Kilpatrick, Jr.
Airworthiness certificate
Standard, Normal
Last inspection
Annual · November 16, 1999 · 28 hours before
Departed
107 · OK
Airport
NONE · Avian County Estates, runway 18, 2,400 × 100 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
Certificate
Private
Airplane ratings
Single-engine land, Single-engine sea
Instrument ratings
Airplane
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Right
Flight hours
3,200 total · 1,200 in this make and model · 3,000 as pilot in command · 25 in the last 90 days · 20 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Temperature
84 °F, dew point 45 °F
Altimeter
30.00 inHg

Other investigations on N5023L · 2

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