Tuesday, March 24, 2020

Loss of Control in Flight: Avid Mark IV, N4829W; accident occurred July 30, 2019 in Thompson Falls, Sanders County, Montana

View of damaged airplane suspended from trees. 
Federal Aviation Administration

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Helena, Montana

Aviation Accident Factual Report - National Transportation Safety Board: https://app.ntsb.gov/pdf

Investigation Docket - National Transportation Safety Board: https://dms.ntsb.gov/pubdms


Location: Thompson Falls, MT
Accident Number: GAA19CA475
Date & Time: 07/30/2019, 0915 MDT
Registration: N4829W
Aircraft: Avid AVID MARK IV
Aircraft Damage: Substantial
Defining Event: Loss of control in flight
Injuries: 2 Serious
Flight Conducted Under: Part 91: General Aviation - Instructional 

The student pilot reported that, during landing on a private grass airstrip, the airplane bounced so he added power to stabilize the airplane before continuing the landing. However, they "began to run out of runway," so he added full power and the flight instructor took control of the airplane. The airplane struck the top of some trees and the right wing hit another tree.

The instructor reported that he believed the airplane's throttle was improperly rigged, explaining that if you released the throttle, it would spring to full open.

The instructor added that during landing the airplane bounced, the student "went wide open throttle," and the airplane stabilized about 15 feet above the ground. He assumed that the student was performing a go around, although they had not previously discussed the procedure. The airplane continued toward the end of the airstrip, but the student did not perform a go around or land. The instructor took control of the airplane and initiated a go-around, but the airplane impacted trees beyond the end of the runway.

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

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

The instructor recommended more practice at a conventional airport prior to practice at the private airstrip with restricted maneuvering space. 

Student Pilot Information

Certificate: None
Age: 69, Male
Airplane Rating(s): None
Seat Occupied: Left
Other Aircraft Rating(s): None
Restraint Used:
Instrument Rating(s): None
Second Pilot Present: Yes
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Unknown
Last FAA Medical Exam:
Occupational Pilot: No
Last Flight Review or Equivalent:
Flight Time:  (Estimated) 43 hours (Total, all aircraft), 2.7 hours (Last 90 days, all aircraft), 1.3 hours (Last 30 days, all aircraft), 0.1 hours (Last 24 hours, all aircraft)

Flight Instructor Information

Certificate: Airline Transport; Flight Instructor; Commercial
Age: 67, Male
Airplane Rating(s): Multi-engine Land; Single-engine Land; Single-engine Sea
Seat Occupied: Right
Other Aircraft Rating(s): None
Restraint Used:
Instrument Rating(s): Airplane
Second Pilot Present: Yes
Instructor Rating(s): Airplane Single-engine
Toxicology Performed: No
Medical Certification: Class 2 With Waivers/Limitations
Last FAA Medical Exam: 01/14/2019
Occupational Pilot: Yes
Last Flight Review or Equivalent: 08/04/2018
Flight Time:  (Estimated) 8941 hours (Total, all aircraft), 6 hours (Total, this make and model), 8650 hours (Pilot In Command, all aircraft), 35 hours (Last 90 days, all aircraft), 12 hours (Last 30 days, all aircraft), 1 hours (Last 24 hours, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: Avid
Registration: N4829W
Model/Series: AVID MARK IV No Series
Aircraft Category: Airplane
Year of Manufacture: 1996
Amateur Built: Yes
Airworthiness Certificate: Experimental
Serial Number: 1541-D
Landing Gear Type: Tailwheel
Seats: 2
Date/Type of Last Inspection:  Condition
Certified Max Gross Wt.: 1250 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time:
Engine Manufacturer: Jabiru
ELT: C91A installed, activated, did not aid in locating accident
Engine Model/Series: 2200
Registered Owner: On file
Rated Power: 85 hp
Operator: On file
Operating Certificate(s) Held: None

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Day
Observation Facility, Elevation: KMLP, 6074 ft msl
Distance from Accident Site: 20 Nautical Miles
Observation Time: 1453 UTC
Direction from Accident Site: 200°
Lowest Cloud Condition: Clear
Visibility:  10 Miles
Lowest Ceiling: None
Visibility (RVR):
Wind Speed/Gusts: Light and Variable /
Turbulence Type Forecast/Actual: None / None
Wind Direction: Variable
Turbulence Severity Forecast/Actual: N/A / N/A
Altimeter Setting: 30.1 inches Hg
Temperature/Dew Point: 16°C / 2°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Thompson Falls, MT
Type of Flight Plan Filed: None
Destination: Thompson Falls, MT
Type of Clearance: None
Departure Time: 0905 MDT
Type of Airspace: Class G 

Wreckage and Impact Information

Crew Injuries: 2 Serious
Aircraft Damage: Substantial
Passenger Injuries: N/A
Aircraft Fire:None 
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 2 Serious
Latitude, Longitude: 47.776667, -115.476111 (est)

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