# NTSB LAX99LA298: Lithuanian Factory of LAK-12, N612LK, Prescott, AZ, September 5, 1999 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: September 5, 1999, 16:30 local (23:30 UTC) - Place: Prescott, AZ - Coordinates: 34.620544, -112.420112 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=34.6205&lon=-112.4201&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report August 14, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 47287 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX99LA298 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/47287/pdf - Page: https://openairdocs.org/ntsb/LAX99LA298 ## Probable cause The pilot's failure to maintain an adequate clearance from ground obstructions during an off-airport landing. The pilot's inability to locate suitable thermal activity to remain aloft is a factor in the accident. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - On ground/water collision with object, landing - roll - weather condition - no thermal lift (contributing factor) - precautionary landing - attempted, pilot in command - object - sign - clearance - not maintained, pilot in command (cause) ## Analysis The pilot reported that he was unable to locate suitable thermals to remain aloft while on a cross-country flight and he elected to execute an off-airport landing on a dirt road. During the landing roll, the right wing tip collided with a road sign and the glider ground looped. The pilot reported that he had not experienced any mechanical malfunction with the glider prior to the accident. ## Factual narrative On September 5, 1999, about 1630 hours mountain standard time, a Lithuanian Factory of Aviation LAK-12, N612LK, collided with obstacles on the ground while making a forced landing about 12 miles south of Prescott, Arizona. The glider, owned and operated by the pilot, was substantially damaged. The private pilot was not injured. The personal cross-country flight, conducted under the provisions of 14 CFR Part 91, originated from the Pleasant Valley Gliderport, Peoria, Arizona, about 1430, and was en route to the Coyote Run Gliderport in Prescott Valley. Visual meteorological conditions prevailed and no flight plan was filed. The pilot reported that the glider encountered an extremely heavy sink rate. He could not locate any thermals in the area so he decided to double back to an area where he had previously encountered strong thermal activity. He reported that he still didn't locate any thermals so he decided to look for a suitable landing location. He saw a dead-end service road that paralleled the highway and noted that the road had no traffic and was straight and long. The pilot reported that he made a normal landing, but the right wing clipped a road sign during the landing roll. He estimated that his speed at the time of the collision was approximately 25 to 30 knots. The glider ground looped and rolled onto a grassy knoll between the highway and the service road. The pilot reported that he hadn't experienced any mechanical malfunction with the glider prior to the accident. ## Aircraft - Registration: [N612LK](https://openairdocs.org/deregistered/N612LK-2021-01-30), registration cancelled 2021-01-30, S/N 6191, built 1995 (OpenAirDocs) - Reported make and model: Lithuanian Factory of Aviation LAK-12 - Registry model: [Lithuanian Factory Of LAK-12](https://openairdocs.org/model/lithuanian-factory-of-lak-12) (registry code 1130839) (OpenAirDocs) - Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs) - Category: Glider - Serial number: 6191 - Airframe hours: 110 - Engines: unknown - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Abe Dresler - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Annual, April 1, 1999, 10 hours before - Departed: PEORIA, AZ - Destination: PRESCOTT VALLEY, AZ ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 44; private; seat: front; flight hours: 135 total, 66 in this make and model, 90 as pilot in command, 8 in the last 90 days, 5 in the last 30 days, 2 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: variable at 4 knots - Visibility: 30 statute miles - Lowest ceiling: none - Temperature: 82 °F, dew point 37 °F - Altimeter: 29.00 inHg - Observed at: PRC, 12 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 (OpenAirDocs). - [Accident 19990905043149A](https://openairdocs.org/incident/19990905043149A), Sep 5, 1999: Lak LAK12, Prescott, AZ, Substantial damage. (.4)On September 5, 1999, about 1630 hours mountain standard time, a lithuanian factory of aviation Lak-12, N612LK, collided with obstacles on the ground while… 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.