Sunday, March 17, 2019

Aerodynamic Stall: Grumman G-164B Ag Cat, accident occurred June 27, 2018 in Malin, Klamath County, Oregon

Additional Participating Entity:

Federal Aviation Administration / Flight Standards District Office; Portland, Oregon

Aviation Accident Final Report - National Transportation Safety Board:

Investigation Docket - National Transportation Safety Board:

Aviation Accident Data Summary - National Transportation Safety Board:

Location: Malin, OR
Accident Number: GAA18CA383
Date & Time: 06/27/2018, 0747 PDT
Registration: N151QC
Aircraft Damage: Substantial
Defining Event: Aerodynamic stall/spin
Injuries: 1 None
Flight Conducted Under: Part 137: Agricultural 


The pilot reported that, during an agricultural application flight, he misjudged the approach and did not have enough clearance to avoid power lines. The airplane began to sink, and he pulled back on the flight control stick. Subsequently, the airplane aerodynamically stalled and then struck power lines.

The airplane sustained substantial damage to the fuselage, empennage, and both wings.

The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The pilot's misjudgment of the approach and his subsequent exceedance of the airplane's critical angle of attack during an agricultural application flight, which resulted in an aerodynamic stall and collision with power lines.


Angle of attack - Capability exceeded (Cause)

Personnel issues
Aircraft control - Pilot (Cause)
Monitoring environment - Pilot (Cause)

Environmental issues
Wire - Effect on operation

Factual Information

History of Flight

Maneuvering-low-alt flying
Aerodynamic stall/spin (Defining event)
Collision with terr/obj (non-CFIT)

Pilot Information

Certificate: Commercial
Age: 29, Male
Airplane Rating(s): Single-engine Land
Seat Occupied: Center
Other Aircraft Rating(s): None
Restraint Used: Unknown
Instrument Rating(s): None
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Class 2 Without Waivers/Limitations
Last FAA Medical Exam: 01/30/2018
Occupational Pilot: Yes
Last Flight Review or Equivalent: 02/11/2017
Flight Time:   (Estimated) 3625 hours (Total, all aircraft), 2520 hours (Total, this make and model), 3575 hours (Pilot In Command, all aircraft), 320 hours (Last 90 days, all aircraft), 150 hours (Last 30 days, all aircraft), 7 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Registration: N151QC
Model/Series: G 164 B
Aircraft Category: Airplane
Year of Manufacture: 1978
Amateur Built: No
Airworthiness Certificate: Restricted
Serial Number: 474B
Landing Gear Type: Tailwheel
Seats: 1
Date/Type of Last Inspection: 03/01/2018, Annual
Certified Max Gross Wt.: 5200 lbs
Time Since Last Inspection:
Engines: 1 Turbo Prop
Airframe Total Time: 4221.5 Hours as of last inspection
Engine Manufacturer: Honeywell
ELT: Not installed
Engine Model/Series: TPE331-2-201A
Rated Power: 715 hp
Operating Certificate(s) Held: Agricultural Aircraft (137)

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Day
Observation Facility, Elevation: KLMT, 4092 ft msl
Distance from Accident Site: 2 Nautical Miles
Observation Time: 1453 UTC
Direction from Accident Site: 321°
Lowest Cloud Condition: Clear
Visibility:  10 Miles
Lowest Ceiling: None
Visibility (RVR):
Wind Speed/Gusts: Calm /
Turbulence Type Forecast/Actual: None / None
Wind Direction:
Turbulence Severity Forecast/Actual: N/A / N/A
Altimeter Setting: 30.03 inches Hg
Temperature/Dew Point: 16°C / 9°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Tulelake, CA (O81)
Type of Flight Plan Filed: None
Destination: Tulelake, CA (O81)
Type of Clearance: None
Departure Time: 0747 PDT
Type of Airspace: Class G

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: N/A
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 1 None
Latitude, Longitude:  42.119722, -121.694167 (est)

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