Sunday, May 5, 2019

Aerodynamic Stall / Spin: Rans S-7S Courier, N8443B; accident occurred August 04, 2018 in Kenai, Alaska

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

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


Aviation Accident Data Summary - National Transportation Safety Board: https://app.ntsb.gov/pdf


http://registry.faa.gov/N8443B

Location: Kenai, AK
Accident Number: GAA18CA469
Date & Time: 08/04/2018, 1530 AKD
Registration: N8443B
Aircraft: Rans S7
Aircraft Damage: Substantial
Defining Event: Aerodynamic stall/spin
Injuries: 1 Minor, 1 None
Flight Conducted Under: Part 91: General Aviation - Personal 

Analysis 

The pilot in the tailwheel-equipped airplane reported that, during the takeoff roll about 40 knots airspeed with full flaps and about 50% of the 900-ft-long runway remaining, the airplane lifted off and began to climb. The airplane climbed above the tree line but then descended into ground effect. The pilot attempted to clear the trees ahead, but the airplane stalled. The left wing dropped, and the airplane descended below the tree line and touched down on the main landing gear, collided with trees, and then came to rest inverted.

The airplane sustained substantial damage to the left wing lift struts.

The pilot reported that he could have used the additional runway surface and held the airplane on the ground to achieve a more desirable airspeed. Additionally, the Pilot’s Operating Handbook stated not to use full flap application during short-field takeoffs.

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 exceedance of the airplane's climb capability due to his use of full flaps during a short-field takeoff, his failure to attain a positive climb rate after takeoff, and his exceedance of the airplane’s critical angle of attack, which resulted in an aerodynamic stall. 

Findings

Aircraft
Climb capability - Capability exceeded (Cause)
Angle of attack - Capability exceeded (Cause)

Personnel issues
Aircraft control - Pilot (Cause)
Use of equip/system - Pilot (Cause)

Environmental issues
Tree(s) - Contributed to outcome

Factual Information

History of Flight

Initial climb
Aerodynamic stall/spin (Defining event)

Landing
Collision with terr/obj (non-CFIT)

Pilot Information

Certificate: Private
Age: 62, Male
Airplane Rating(s): Single-engine Land; Single-engine Sea
Seat Occupied: Front
Other Aircraft Rating(s): None
Restraint Used: 4-point
Instrument Rating(s): None
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: Yes
Medical Certification: Sport Pilot Without Waivers/Limitations
Last FAA Medical Exam: 07/16/2013
Occupational Pilot: No
Last Flight Review or Equivalent: 08/03/2018
Flight Time:   (Estimated) 1273 hours (Total, all aircraft), 360 hours (Total, this make and model), 1273 hours (Pilot In Command, all aircraft)

Aircraft and Owner/Operator Information

Aircraft Make: Rans
Registration: N8443B
Model/Series: S7 S
Aircraft Category: Airplane
Year of Manufacture: 2006
Amateur Built: Yes
Airworthiness Certificate: Experimental
Serial Number: 0405398
Landing Gear Type: Tailwheel
Seats: 2
Date/Type of Last Inspection: 06/14/2018, Condition
Certified Max Gross Wt.: 1320 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time: 382 Hours at time of accident
Engine Manufacturer: Rotax
ELT: Installed, not activated
Engine Model/Series: 912S
Registered Owner: On file
Rated Power: 100 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: PALV, 60 ft msl
Distance from Accident Site: 17 Nautical Miles
Observation Time: 2344 UTC
Direction from Accident Site: 214°
Lowest Cloud Condition: Clear
Visibility:  10 Miles
Lowest Ceiling: None
Visibility (RVR):
Wind Speed/Gusts: 5 knots /
Turbulence Type Forecast/Actual: /
Wind Direction: 240°
Turbulence Severity Forecast/Actual: /
Altimeter Setting: 29.87 inches Hg
Temperature/Dew Point: 21°C / 12°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Kenai, AK (PVT)
Type of Flight Plan Filed: None
Destination: Kenai, AK (PVT)
Type of Clearance: None
Departure Time: 1530 AKD
Type of Airspace: Class G

Airport Information

Airport: Private Airstrip (PVT)
Runway Surface Type: Dirt
Airport Elevation: 100 ft
Runway Surface Condition: Dry; Vegetation
Runway Used: 27
IFR Approach: None
Runway Length/Width: 900 ft / 100 ft
VFR Approach/Landing: None

Wreckage and Impact Information

Crew Injuries: 1 Minor
Aircraft Damage: Substantial
Passenger Injuries: 1 None
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 1 Minor, 1 None
Latitude, Longitude: 61.045278, -151.979722 (est)

No comments: