Sunday, August 30, 2020

Landing Gear Collapse: Piper PA-22-150, N7236D; accident occurred August 28, 2019 in Talkeetna, Alaska

Accident airplane after recovery.

Landing gear with separated landing gear fitting attached.

Fuselage where landing gear fitting separated.

Separated landing gear fitting.

The National Transportation Safety Board did not travel to the scene of this accident.

Additional Participating Entity:

Federal Aviation Administration / Flight Standards District Office; Anchorage, Alaska

Aviation Accident Factual Report - National Transportation Safety Board:

Investigation Docket - National Transportation Safety Board:

Location: Talkeetna, AK
Accident Number: ANC19LA047
Date & Time: 08/29/2019, 1900 AKD
Registration: N7236D
Aircraft: Piper PA-22-150
Aircraft Damage: Substantial
Defining Event: Landing gear collapse
Injuries: 2 None
Flight Conducted Under: Part 91: General Aviation - Instructional 

On August 29, 2019, at about 1900 Alaska daylight time, a tundra tire and tailwheel-equipped Piper PA-22 airplane, N7236D, sustained substantial damage following a partial separation of the left main landing gear near Talkeetna, Alaska. The certificated flight instructor and certificated private pilot receiving instruction were not injured. The airplane was registered to Christianson Lake Rentals Maintenance LLC and operated by Alaska Floats and Skis, under the provisions of Title 14 Code of Federal Regulations Part 91 when the accident occurred. Visual meteorological conditions prevailed, and a company flight plan had been filed. The flight departed Talkeetna Airport (PATK), Talkeetna, Alaska.

According to the operator, while dragging an off-airport landing site, the flight instructor heard an audible "pop" and noticed a partial separation of the left main landing gear. They returned to Talkeetna, conducted a fly by and were informed that the left main landing gear was loose. During the ensuing emergency landing, the airplane ground looped and sustained substantial damage to the fuselage.

An initial examination of the airplane revealed that the aft left weld-on fuselage landing gear fitting had separated at the weld area from the fuselage.

A photographic visual examination of the fractured weld surfaces by the National Transportation Safety Board (NTSB) Materials Laboratory revealed an unacceptable weld filet profile, which included incomplete fusion, a lack of penetration, and gross porosity in the weld deposit. The NTSB Materials Laboratory examination report is in the public docket for this accident.

The closest weather reporting facility is Talkeetna Airport, (PATK), Talkeetna, Alaska. At 1853, a METAR from PATK was reporting in part: wind, 200° at 4 knots; visibility, 5 statute miles, smoke, haze; sky condition, overcast clouds, 4,600 ft; temperature, 66° F; dew point 45° F; and an altimeter setting of 30.08 inches of mercury. 

Pilot Information

Certificate: Flight Instructor; Commercial
Age: 23, 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 Without Waivers/Limitations
Last FAA Medical Exam: 04/23/2019
Occupational Pilot: Yes
Last Flight Review or Equivalent:06/20/2019 
Flight Time:   1200 hours (Total, all aircraft), 200 hours (Total, this make and model), 2 hours (Pilot In Command, all aircraft), 200 hours (Last 90 days, all aircraft), 60 hours (Last 30 days, all aircraft), 3 hours (Last 24 hours, all aircraft)

Pilot Information

Certificate: Airline Transport
Age: 58, Male
Airplane Rating(s): Single-engine Land
Seat Occupied: Left
Other Aircraft Rating(s):None
Restraint Used:
Instrument Rating(s): Airplane
Second Pilot Present: Yes
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Unknown
Last FAA Medical Exam:
Occupational Pilot:
Last Flight Review or Equivalent:
Flight Time:

Aircraft and Owner/Operator Information

Aircraft Make:Piper
Registration: N7236D
Model/Series: PA-22-150
Aircraft Category: Airplane
Year of Manufacture:1957
Amateur Built:No
Airworthiness Certificate: Normal
Serial Number: 22-5062
Landing Gear Type: Tailwheel
Date/Type of Last Inspection: 07/23/2019, Continuous Airworthiness
Certified Max Gross Wt.: 2000 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time: 3836.6 Hours as of last inspection
Engine Manufacturer: Lycoming
ELT: C91 installed
Engine Model/Series:O-320 SERIES
Registered Owner: Christianson Lake Rentals Maintenance Ll
Rated Power: 150 hp
Operator: Alaska Floats and Skis
Operating Certificate(s) Held: None

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Day
Observation Facility, Elevation: PATK
Distance from Accident Site:
Observation Time: 1853 ADT
Direction from Accident Site:
Lowest Cloud Condition: Clear
Visibility:  5 Miles
Lowest Ceiling: Overcast / 4600 ft agl
Visibility (RVR):
Wind Speed/Gusts: 4 knots /
Turbulence Type Forecast/Actual:
Wind Direction: 200°
Turbulence Severity Forecast/Actual:
Altimeter Setting: 30.08 inches Hg
Temperature/Dew Point: 19°C / 7°C
Precipitation and Obscuration: Moderate - Smoke; Moderate - Haze
Departure Point: Talkeetna, AK (TKA)
Type of Flight Plan Filed: Company VFR
Destination: Talkeetna, AK (TKA)
Type of Clearance: None
Departure Time: 1700 AKD
Type of Airspace: Class G

Airport Information

Airport: Talkeetna (TKA)
Runway Surface Type: Asphalt
Airport Elevation: 364 ft
Runway Surface Condition: Dry
Runway Used: 19
IFR Approach:None
Runway Length/Width: 3500 ft / 75 ft
VFR Approach/Landing: Full Stop; Traffic Pattern 

Wreckage and Impact Information

Crew Injuries: 2 None
Aircraft Damage: Substantial
Passenger Injuries: N/A
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 2 None
Latitude, Longitude: 62.321389, -150.092778 (est)

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