# NTSB LAX00LA285: Grumman G-164B, N6737K, Tracy, CA, August 1, 2000 - Type: NTSB accident investigation - Classification: Accident · Fatal · Limited investigation · Final report - Date: August 1, 2000, 11:47 local (18:47 UTC) - Place: Tracy, CA - Coordinates: 37.831943, -121.403053 - Nearby events: https://openairdocs.org/map.md?lat=37.8319&lon=-121.4031&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Highest injury: Fatal - Injuries: 1 fatal - Status: Completed, report April 18, 2003 - Report: Approved by Office Director - Parties: FEDERAL AVIATION ADMINISTRATION - NTSB case key (mKey): 49924 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX00LA285 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/49924/pdf - Page: https://openairdocs.org/ntsb/LAX00LA285 ## Probable cause The pilot's failure to maintain adequate clearance from obstacles while maneuvering during an aerial application flight. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - In flight collision with object, maneuvering - aerial application - object - electrical tower - altitude/clearance - not maintained, pilot in command (cause) - wing - cut/severed - aircraft control - not possible, pilot in command - In flight collision with terrain/water, descent - uncontrolled ## Analysis The pilot made an abrupt course change while repositioning the airplane during an agricultural application flight. The pilot failed to maintain adequate clearance from a nearby 300-foot-tall transmission line, and a collision ensued. During the impact sequence, a portion of the airplane’s right wing was severed. The airplane descended uncontrollably and caught on fire seconds after impacting the ground. Tetrahydrocannabinol carboxylic acid (marihuana) was detected at a level of 0.018 ug/ml in the pilot's blood, and it was also found in his urine. ## Factual narrative On August 1, 2000, about 1147 Pacific daylight time, a Grumman G-164B, N6737K, collided with an electrical tower approximately 5 miles north of Tracy, California. The airplane was destroyed in the collision sequence. The certificated commercial pilot, the sole occupant, received fatal injuries. Haley Flying Service, Inc., operated the airplane during the agricultural flight under the provisions of 14 CFR Part 137. The flight departed the Haley Flying Service private agricultural strip about 1143. Visual meteorological conditions prevailed and no flight plan had been filed. Witnesses stated that the airplane was making a turn when it appeared to stall, roll to the right, and collide with the top of a 300-foot-tall electrical transmission tower. The airplane's right wing was partially severed. Thereafter, they observed the airplane continue traveling about 130 yards before finally impacting the ground in an inverted attitude in an adjacent agricultural field. A fire erupted about 10 seconds after the airplane came to rest, and it partially consumed the wreckage. According to Federal Aviation Administration (FAA) personnel, when the pilot initiated the flight the airplane was carrying 60 gallons of fuel and 300 gallons of nonflammable pesticide. The FAA reported that according to the pilot's ground-based "flagger" (who was also a pilot), the spray application flight profile called for the pilot to execute his first pass on the east side of the crop. After commencing the flight in this direction, the pilot made an abrupt midcourse directional change, as though he had elected to spray from another direction first. According to the flagger, following the abrupt course change, the airplane was headed toward the transmission tower. The flagger additionally reported that the pilot then raised the nose of the airplane to clear the tower. The airplane appeared to stall just before the collision. During the subsequent wreckage examination, a portion of the airframe was found lodged in the top of the electrical tower at the point of initial impact. A wing segment was found severed and lay near the tower's base. Two transmission lines were downed and lay strewn about the main wreckage area. Pacific Gas and Electric Company personnel reported that, at the time of the accident, the lines were energized with 230,000 volts of electricity. The manager of the FAA's Toxicology and Accident Research Laboratory reported finding evidence of tetrahydrocannabinol carboxylic acid (marihuana) in the pilot's blood at a level of 0.018 ug/ml. It was also found in his urine. ## Aircraft - Registration: [N6737K](https://openairdocs.org/deregistered/N6737K-2000-09-28), registration cancelled 2000-09-28, S/N 454B (OpenAirDocs) - Reported make and model: Grumman G-164B - Registry model: [Grumman Acft ENG Cor-Schweizer G-164B](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164b) (registry code 3952802) (OpenAirDocs) - Category: Airplane - Serial number: 454B - Airframe hours: 6650 - Engines: Pratt & Whitney R-1340 600 horsepower reciprocating - Damage: Destroyed - Fire: On-Ground - Flight: Aerial application, Part 137 - Registered owner: Haley Flying Service, Inc. - Airworthiness certificate: Standard, Utility - Last inspection: 100 hour, July 28, 2000, 25 hours before - Departed: TRACY, CA - Destination: TRACY, CA ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 55; injuries: fatal; commercial; airplane ratings: single-engine sea, single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review March 31, 1999; seat: front; toxicology performed; flight hours: 25,000 total, 20,000 in this make and model, 143 in the last 90 days, 60 in the last 30 days, 5 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: variable at 4 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 99 °F, dew point 61 °F - Altimeter: 29.86 inHg - Observed at: SCK, 14 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 20000801012539A](https://openairdocs.org/incident/20000801012539A), Aug 1, 2000: Scwzer G164B, Tracy, CA, Destroyed, 1 fatal. (-23) Referenced a/c piloted by mr mark melson, was witnessed to have struck the top of a 200 foot high tension transmission tower, whereupon the right wing… 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.