# NTSB FTW00LA133: Lake LA-4-200, N5023L, Claremore, OK, April 28, 2000 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: April 28, 2000, 15:15 local (20:15 UTC) - Place: Claremore, OK - Coordinates: 36.309844, -95.609809 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=36.3098&lon=-95.6098&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 3 minor - Status: Completed, report July 17, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 49081 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW00LA133 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/49081/pdf - Page: https://openairdocs.org/ntsb/FTW00LA133 ## Probable cause The pilot's premature raising of the flaps. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - In flight collision with object, go-around (vfr) - go-around - delayed, pilot in command (cause) - clearance - not maintained, pilot in command (cause) - 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](https://openairdocs.org/aircraft/N5023L), registered now, S/N 480, built 1971 (OpenAirDocs) - Reported make and model: Lake LA-4-200 - Registry model: [Lake LA-4-200](https://openairdocs.org/model/lake-la-4-200) (registry code 5110310) (OpenAirDocs) - Registry engine: [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series) (registry code 41515, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 480 - Airframe hours: 1870 - Engines: 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 ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; 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) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB ERA21LA078](https://openairdocs.org/ntsb/ERA21LA078), Dec 15, 2020: Lake LA-4-200 (N5023L), Orlando, FL, substantial damage. Probable cause: The pilot’s improper recovery from a bounced landing. - [NTSB OAK72FXO37](https://openairdocs.org/ntsb/OAK72FXO37), Jun 24, 1972: Lake LA-4 (N5023L), Homewood, CA, substantial damage From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.