# NTSB CEN14LA319: Grumman G 164, N455Y, Anadarko, OK, June 20, 2014 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: June 20, 2014, 10:35 local (15:35 UTC) - Place: Anadarko, OK - Coordinates: 35.059574, -98.239585 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=35.0596&lon=-98.2396&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Defining event: [Maneuvering-low-alt flying: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report September 14, 2016 - Report: Approved by Office Director - NTSB office: Central Region - Parties: FAA FSDO - NTSB case key (mKey): 89539 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN14LA319 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/89539/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=89539 - Page: https://openairdocs.org/ntsb/CEN14LA319 ## Probable cause The total loss of engine power while climbing after takeoff for reasons that could not be determined based on the available information. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Not determined](https://openairdocs.org/ntsb-findings/05000000): Not determined › Not determined · Unknown/Not determined (probable cause); cases with it: [Grumman G-164, 1 case](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=3952702), [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Maneuvering-low-alt flying: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) (defining event); cases with it: [Grumman G-164, 4 cases](https://openairdocs.org/ntsb-events/341/sequence.md?model=3952702), [All aircraft, 3,820 cases](https://openairdocs.org/ntsb-events/341/sequence.md) ## Analysis The commercial pilot reported that, on the day before the accident, a mechanic had replaced the radial engine's magneto seals. The pilot performed a successful magneto check and run-up after the magneto seal installation. On the day after the maintenance (accident flight), the engine run-up was normal, and a successful magneto check was performed before takeoff. The agricultural airplane took off with a load of chemicals from a private airstrip. While the airplane was climbing, the engine began to lose power, and as the pilot turned back to the airstrip, the engine lost all power. When the airplane was about 100 ft above the ground, the pilot chose to land the airplane in a small open field. He reported that he thought that the airplane was beginning to stall as he pulled the throttle all the way back and pushed the stick forward. The airplane subsequently impacted the ground and flipped over. Review of available engine logbooks did not show any anomalies that would have led to the loss of engine power. The engine was not examined, and the reason for the loss of power could not be determined. ## Factual narrative On June 20, 2014, about 1035 central standard time, a Grumman G-164 agricultural airplane, N455Y, sustained substantial damage following a forced landing after a loss of engine power in the vicinity of Anadarko, Oklahoma. The commercial rated pilot, who was the sole occupant, sustained serious injuries. The agricultural flight was being conducted under the provisions of Federal Code of Regulations Part 137. Visual meteorological conditions prevailed throughout the vicinity and a flight plan was not filed. The local flight originated from a private agricultural airstrip near Anadarko, Oklahoma, at 1030. According to the pilot, the airplane had been running well on previous flights. After which, he discovered that oil was leaking from the magneto gear seals of the Pratt & Whitney R-985 radial engine. On October 18th, the pilot said that he called a repair station (Covington Aircraft) to have a mechanic come to replace the magneto seals. On October 19th, a mechanic arrived and replaced the magneto seals. The mechanic also gapped the points prior to reinstalling the magnetos. After the work was completed, the airplane engine was started by the pilot and the magneto check was measured as normal. The pilot stated that he thought that the airplane was fixed on the morning of the accident flight, so he loaded with 200 gallons of pesticide, warmed the engine for 30 minutes, and taxied to the departure runway. During the engine run up, the pilot did a successful magneto check and all engine gauges appeared normal. During takeoff, the airplane came off the ground normal and was climbing out. While departing toward the northeast, the engine began to lose power. As the pilot made a turn back to the airstrip, the engine lost all power. Within about 100 feet of the ground, the pilot elected to land the airplane in a small open field just below the airplane. He thought that the airplane was beginning to stall as he pulled the throttle all the way back and pushed the stick forward. The pilot flared and the next thing that he remembered was sliding backwards with the top of the windscreen scooping up dirt. A summary review of the most recent engine logbook showed an entry dated April 2, 2014. The entry did not show a total engine time and showed 0.0 hours since major overhaul (SMOH), with a test run, inspection, and return to service. The entry on next the next page was dated March 2, 2014, (out of chronological sequence from the prior entry) stating that the engine was overhauled and returned to service. There were no logbook entries found relating to the magneto seals. However, there was separate documentation, dated June 19, 2014, showing a magneto drive seal kit being delivered and installed on the airplane as the pilot reported. Repeated attempts by the NTSB to obtain additional information from the pilot and the pilot's representative were not successful. ## Aircraft - Registration: [N455Y](https://openairdocs.org/deregistered/N455Y-2018-03-23), registration cancelled 2018-03-23, S/N 101, built 1962 (OpenAirDocs) - Reported make and model: GRUMMAN G 164 (UNDESIGNAT) - Registry model: [Grumman G-164](https://openairdocs.org/model/grumman-g-164) (registry code 3952702) (OpenAirDocs) - Registry engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 101 - Year built: 1962 - Engines: P&W R-985 SERIES 450 horsepower reciprocating - Damage: Substantial damage - Flight: Aerial application, Part 137 - Airworthiness certificate: Special, Restricted (Special) - Departed: Anadarko, OK - Destination: Anadarko, OK - Equipment: None ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 57; injuries: serious; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, without waivers/limitations; seat: single; flight hours: 4,000 total, 2,000 in this make and model, 200 in the last 90 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 220° at 7 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 73 °F, dew point 70 °F - Altimeter: 30.07 inHg - Observed at: CHK ## 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 20140620011829A](https://openairdocs.org/incident/20140620011829A), Jun 20, 2014: Grumman G-164, Anadarko, OK, Substantial damage. Aircraft had engine maintenance performed the day before accident. Before flight pilot performed run up and mag checks before flight and everything was normal.… ## Other investigations on N455Y (1) 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 DEN88LA131](https://openairdocs.org/ntsb/DEN88LA131), Jun 18, 1988: Grumman G-164 (N455Y), Ayr, ND, substantial damage ## Docket (7 files) The files NTSB released with the investigation on July 19, 2016, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=89539. 3.5 MB in all. - Memorandum for Record - NTSB IIC Statement (item 1, .PDF, 39 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40442425&FileExtension=.PDF&FileName=Memorandum%20for%20Record%20-%20NTSB%20IIC%20Statement-Master.PDF - Memorandum for Record - Pilot Statement (item 2, .PDF, 46 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40442426&FileExtension=.PDF&FileName=Memorandum%20for%20Record%20-%20Pilot%20Statement-Master.PDF - Mechanic Statement (item 3, .PDF, 198 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40442427&FileExtension=.PDF&FileName=Mechanic%20Statement-Master.PDF - Excerpts of Available Logbooks (item 4, .PDF, 1.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40442428&FileExtension=.PDF&FileName=Excerpts%20of%20Available%20Logbooks-Master.PDF - Records of Magneto Seal Repair Work (item 5, .PDF, 485 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40442429&FileExtension=.PDF&FileName=Records%20of%20Magneto%20Seal%20Repair%20Work-Master.PDF - Oklahoma Department of Public Safety Report (item 6, .PDF, 585 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40442430&FileExtension=.PDF&FileName=Oklahoma%20Department%20of%20Public%20Safety%20Report-Master.PDF - Photo Array (item 7, .PDF, 2 photos, 524 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40442431&FileExtension=.PDF&FileName=Photo%20Array-Master.PDF 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.