# NTSB FTW93LA169: Grumman G-164A, N4593, Weiner, AR, May 27, 1993 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: May 27, 1993, 07:45 local (12:45 UTC) - Place: Weiner, AR - Coordinates: 35.610832, -90.899818 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=35.6108&lon=-90.8998&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report June 30, 1994 - Report: Approved by Office Director - NTSB case key (mKey): 18758 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW93LA169 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/18758/pdf - Page: https://openairdocs.org/ntsb/FTW93LA169 ## Probable cause PARTIAL POWER LOSS DUE TO IMPROPER INSTALLATION OF THE LINKAGE CONTROL BRACKET. A FACTOR WAS THE LACK OF SUITABLE TERRAIN FOR THE FORCED LANDING. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(partial) - mech failure/malf, maneuvering - aerial application - throttle/power lever,linkage - loose (cause) - maintenance,installation - improper, other maintenance personnel (cause) - Forced landing, descent - emergency - Nose over, landing - roll - terrain condition - none suitable ## Analysis THE ENGINE SUSTAINED A PARTIAL POWER LOSS DURING AN AERIAL APPLICATION MANEUVER AND THE PILOT WAS UNABLE TO SUSTAIN FLIGHT. HE SUBSEQUENTLY LANDED IN AN OPEN, ROUGH FIELD AND THE AIRPLANE NOSED OVER DURING THE LANDING ROLL. INVESTIAGATION REVEALED THE ENGINE CONTROL LINKAGE ASSEMBLY BRACKET WAS LOOSE, ALLOWING MOVEMENT OF THE CONDITION LEVER, PITCH CONTROL GOVERNOR, AND FUEL CONTROL UNIT SETTINGS. THE ENGINE HAD BEEN INSTALLED SIXTY DAYS PRIOR TO THE ACCIDENT. ## Factual narrative On May 27, 1993, at approximately 0745 central daylight time, a Grumman G-164A, N4593, was substantially damaged when it nosed over during a forced landing after experiencing a loss of engine power near Weiner, Arkansas. The airplane, flown by a commercial pilot, was on a local aerial application flight. There was no flight plan filed and visual meteorological conditions prevailed throughout the area. The pilot, the sole occupant, was not injured. According to the pilot, the engine experienced a partial power loss during the turn at the end of a spray run. He stated that he dumped the chemical load, but was unable to sustain flight with the power available. He subsequently executed a forced landing to an open plowed field. The field was rough and the airplane nosed over during the landing roll. Investigation revealed that the control linkage assembly bracket was loose which allowed the condition lever to make an uncommanded move and disturbed the propeller governor, pitch control governor, and fuel control unit settings. Of the three retaining screws, one was missing and the other two were found loose. The airplane's maintenance records indicated that the engine had been installed on April 1, 1993, at the same time the airplane received an annual inspection. ## Aircraft - Registration: [N4593](https://openairdocs.org/deregistered/N4593-2013-04-30), registration cancelled 2013-04-30, S/N 1082, built 1973 (OpenAirDocs) - Reported make and model: GRUMMAN G-164A - Registry model: [Grumman G-164A](https://openairdocs.org/model/grumman-g-164a) (registry code 3952704) (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: 1082 - Airframe hours: 5506 - Engines: GARRETT TPE-331-43-A 575 horsepower turbo prop - Damage: Substantial damage - Flight: Aerial application, Part 137 - Registered owner: Addington, Bobby N. - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, April 1, 1993, 10 hours before - Departed: NONE, BEEDEVILLE, AR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 50; commercial; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: center; flight hours: 8,500 total, 8,000 in this make and model, 8,000 as pilot in command, 70 in the last 90 days, 50 in the last 30 days, 5 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 73 °F ## 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 19930527015429A](https://openairdocs.org/incident/19930527015429A), May 27, 1993: Scwzer G164A, Weiner, AR, Substantial damage. Lost partial power on procedure turn. Nosed over landing rough field. Engine control linkage brackett came loose. ## Other investigations on N4593 (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 DEN84LA235](https://openairdocs.org/ntsb/DEN84LA235), Jul 25, 1984: Grumman G-164A (N4593), Chamerlain, SD, substantial damage - [NTSB MIA80FKJ03](https://openairdocs.org/ntsb/MIA80FKJ03), Oct 8, 1979: Grumman G-164A (N4593), Vincent, AL, 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.