# NTSB LAX08LA161: Davison Vari Eze, N644VZ, Arlington, WA, June 2, 2008 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: June 2, 2008, 10:50 local (17:50 UTC) - Place: Arlington, WA - Coordinates: 48.160278, -122.158889 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=48.1603&lon=-122.1589&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Defining event: [Approach-VFR pattern base: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report April 15, 2009 - Report: Approved by Office Director - Parties: Federal Aviation Administration - NTSB case key (mKey): 68153 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX08LA161 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/68153/pdf - Page: https://openairdocs.org/ntsb/LAX08LA161 ## Probable cause A loss of engine power for undetermined reasons. ## 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: [Davison JB VARI EZE, 1 case](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=05621QH), [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md) - [Engine (reciprocating)](https://openairdocs.org/ntsb-findings/01058500): Aircraft › Aircraft power plant · Not specified (probable cause); cases with it: [Davison JB VARI EZE, 1 case](https://openairdocs.org/ntsb-findings/01058500/cases.md?model=05621QH), [All aircraft, 497 cases](https://openairdocs.org/ntsb-findings/01058500/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Approach-VFR pattern base: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) (defining event); cases with it: [Davison JB VARI EZE, 1 case](https://openairdocs.org/ntsb-events/341/sequence.md?model=05621QH), [All aircraft, 3,820 cases](https://openairdocs.org/ntsb-events/341/sequence.md) ## Analysis While the amateur-built airplane was on the base leg of the traffic pattern at the destination airport, the pilot advanced the throttle forward. The engine did not respond and subsequently lost power. The pilot decided to land in a field below and the airplane nosed over during the landing roll. According to the pilot, the engine had a history of losing power as a result of air entering the fuel system. A Federal Aviation Administration inspector examined the airplane and stated that postaccident manipulation of the cockpit throttle control revealed that the throttle cable outer housing would slip out of the throttle quadrant and as a consequence the throttle arm on the engine fuel body would not move. It could not be determined if this discrepancy was a result of the impact. No evidence of any other mechanical discrepancies were noted with the engine. ## Factual narrative On June 02, 2008, about 1050 Pacific daylight time, a Davison Vari Eze, N644VZ, crashed in a field near Arlington Municipal Airport, Arlington, Washington. The pilot, who was additionally the owner and builder, was operating the airplane under the provisions of 14 Code of Federal Regulations Part 91. The private pilot, the sole occupant, sustained minor injuries; the airplane sustained substantial damage. The personal local area flight departed from Arlington about 1000. Visual meteorological conditions prevailed, and a flight plan had not been filed. In a telephone conversation with a National Transportation Safety Board investigator, the pilot reported that the accident flight was the airplane's second flight. As it was to be an introduction flight, he planned to perform maneuvers in the local area and get accustomed to the flight characteristics of the airplane. After 45 minutes aloft, with the airplane adjacent to Mount Vernon, Washington, the tachometer began reading erratically and subsequently failed, reading zero. The pilot opted to return to Arlington and entered the downwind leg of the traffic pattern for runway 16. He turned the airplane (right) onto the base leg and leveled the wings. He glanced down at the tachometer and noted that it indicated 0 rpm, an indication that the gauge was still inoperative. The pilot further stated that he advanced the throttle forward, but the engine did not respond. The engine had experienced a total loss of power. He selected a field below to land in and the airplane nosed over during the landing roll. The pilot added that during the time of the engine failure the fuel selector was positioned on the main fuel tanks, each of which contained about 4 gallons. The pilot later opined that the loss of engine power was a result of air getting entrapped in the fuel system, as the airplane was not equipped with a fuel pump. He added that during a high-speed taxi test in the early stages of the airplane's testing, the engine had quit as a result of air entering the system. The airplane was equipped with a Teledyne Continental Motors (TCM) C85 engine, which had a supplemental type certificate (STC) for various upgrades to make it comparable to an O-200. The airplane additionally was configured with an Ellison throttle body and did not have a fuel pump (gravity fed fuel system). The engine was secured for a future teardown examination. A mechanic examined the wreckage under the auspice of a Federal Aviation Administration (FAA) inspector. The mechanic and FAA inspector reported finding no discrepancies in compression, magneto firing, or fuel system continuity. Manipulation of the cockpit engine controls revealed that when advancing the throttle control, the throttle control outer cable housing would slip out of the throttle quadrant and the throttle arm on the engine fuel body did not move. All other controls would easily move through normal travel. It could not be determined if this discrepancy was a result of the impact. The Ellison Throttle Body Injector Manual section 2-5, Installation, states a caution of "In the event of any throttle linkage failure allowing unrestrained throttle movement, the engine will immediately and without hesitation, return to idle." ## Aircraft - Registration: [N644VZ](https://openairdocs.org/deregistered/N644VZ-2013-07-08), registration cancelled 2013-07-08, S/N 237-A, built 2008 (OpenAirDocs) - Reported make and model: Davison Vari Eze - Registry model: [Davison JB VARI EZE](https://openairdocs.org/model/davison-jb-vari-eze) (registry code 05621QH) (OpenAirDocs) - Registry engine: [Continental C85 series](https://openairdocs.org/engine/continental-c85-series) (registry code 17008, reciprocating) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: 237-A - Airframe hours: 6 - Engines: Continental C85 100 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Special, Experimental (Special) - Departed: AWO, Arlington, WA - Destination: AWO, Arlington, WA - Flight plan: Unknown - Airport: AWO, Arlington Municipal Airport ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 67; injuries: minor; private; airplane ratings: single-engine land; medical: class 3, with waivers/limitations; seat: front; flight hours: 600 total ## Weather - Conditions: Visual (VMC), Day - Wind: 160° at 5 knots - Visibility: 10 statute miles - Lowest ceiling: 3,700 ft overcast - Temperature: 55 °F, dew point 45 °F - Altimeter: 30.11 inHg - Observed at: AWO ## 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 20080602834269A](https://openairdocs.org/incident/20080602834269A), Jun 2, 2008: Amtr VARIEZE, Arlington, WA, Destroyed. (-23) On 06/02/2008, at approximately 1052 PST, a davison Varieze amatuer built aircraft, N644VZ, owned and operated [privacy data omitted] experienced a loss… 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.