Tuesday, July 19, 2016

Stinson 108-2 Voyager, N343C, registered to and operated by the pilot: Accident occurred July 18, 2016 at Haines Airport (PAHN), Alaska

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

Additional Participating Entity:

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

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

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

http://registry.faa.gov/N343C

Aviation Accident Factual Report - National Transportation Safety Board

Location: Haines, AK
Accident Number: ANC16LA048
Date & Time: 07/18/2016, 1230 AKD
Registration: N343C
Aircraft: STINSON 108
Aircraft Damage: Substantial
Defining Event: Loss of control on ground
Injuries: 4 None
Flight Conducted Under: Part 91: General Aviation - Personal 

On July 18, 2016, about 1230 Alaska daylight time, a tailwheel-equipped Stinson 108 airplane, N343C, sustained substantial damage following a loss of control during the landing rollout at Haines Airport, Haines, Alaska. The certificated private pilot, and three passengers were not injured. The airplane was registered to and operated by the pilot, as a visual flight rules (VFR) personal flight, under the provisions of 14 Code of Federal Regulations (CFR) Part 91. Visual meteorological conditions prevailed at the time of the accident and no flight plan was filed. The flight departed the Skagway Airport (SGY), Alaska, at about 1200, destined for the Haines Airport (HNS).

The pilot stated in the National Transportation Safety Board (NTSB) Form 6120.1, that he listened to the automated weather at HNS prior to arrival. He elected to land runway 26 with a quartering tailwind because the winds were light and variable. He performed a normal wheel landing, and during the roll out, when the airplane was about 20 mph, he started a right turn towards taxiway B, a high-speed exit taxiway. As he initiated the turn, the airplane abruptly turned right, which resulted in a 180° right ground loop. The pilot stated that he applied full left rudder and left brake during the turn, however the right turn continued. The left main landing gear collapsed and the fuselage and left wing impacted the runway surface. Substantial damage was sustained by the left wing, aileron, lift strut and lower fuselage. The pilot also stated that the winds were stronger and gusting from various directions after the accident.

In an interview, a passenger who was in the front right seat stated that during the approach he heard the automated weather at HNS report wind at 4 knots, but he could not remember the reported direction. He said that the landing felt normal to him, however near the end of the landing roll, the airplane made an unexpected abrupt right turn, and then collapsed onto the left side during the ground loop. He stated that after the accident he noticed that the winds were gusting at times.

Photographs revealed metal scrapes on the runway surface that were collocated with rubber wheel skid marks from the left main landing gear wheel. The ground scars began about 50 feet prior to the tight ground loop signatures. The left main landing gear wheel assembly separated from the left main landing gear leg at the axle weld, and came to rest about 15 feet behind the wreckage. The left main landing gear leg separated from the fuselage near the upper shock strut attachment points. There were no tailwheel abnormalities observed at the accident scene. The airplane was towed to a hangar on the right main landing gear wheel and tailwheel.

During a post-accident examination of the airplane after recovery, the pilot discovered that the airframe tailwheel assembly attachment mount was fractured through the entire width. The bracket is one of two airframe attachments points for the tailwheel assembly. The tailwheel attachment mount and left main landing gear wheel hub and axle were sent to the NTSB Material Laboratory for detailed examinations.

An NTSB materials engineer conducted a detailed examination of the fractured tailwheel assembly. Features consistent with corrosion intermixed with overstress failure were present at the bracket weld. The fractured surface of the left wheel axle was also examined. The features on this fracture surface were generally consistent with tensile overstress, such as microscopic dimple ruptures. The wheel axle also exhibited some areas with intergranular fracture and irregular weld material. A Materials Laboratory Factual Report is included in the public docket.

The airplane had total time of 3,305 hours, and an annual inspection had been completed on August 14, 2015. According to the pilot's statement, the landing weight was estimated at 2200 lbs., which was 30 lbs. under the maximum gross weight limit for this airplane. The pilot originally stated the landing weight at 2240 lbs. on the NTSB form 6120.1, but then changed it via email.

The pilot had logged about 1001 total flight hours and 900 hours of pilot in command time in the accident airplane. His last biennial flight review was conducted in the accident airplane on March 29, 2016.

The closest weather reporting facility was HNS. At 1154, a HNS METAR reported in part: wind from 150° at 3 knots; sky condition, clear; visibility 10 statute miles; temperature 70° F; dew point 57° F; barometric pressure 29.90 inches of mercury.

Pilot Information

Certificate: Private
Age: 61, Male
Airplane Rating(s): Single-engine Land; Single-engine Sea
Seat Occupied: Left
Other Aircraft Rating(s): None
Restraint Used: 4-point
Instrument Rating(s): None
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Class 3 With Waivers/Limitations
Last FAA Medical Exam: 03/01/2015
Occupational Pilot: No
Last Flight Review or Equivalent: 03/31/2015
Flight Time:  (Estimated) 1001 hours (Total, all aircraft), 900 hours (Total, this make and model), 1000 hours (Pilot In Command, all aircraft) 

Aircraft and Owner/Operator Information

Aircraft Manufacturer: STINSON
Registration: N343C
Model/Series: 108
Aircraft Category: Airplane
Year of Manufacture: 1947
Amateur Built: No
Airworthiness Certificate: Normal
Serial Number: 108-3343
Landing Gear Type: Tailwheel
Seats: 4
Date/Type of Last Inspection: 08/14/2015, Annual
Certified Max Gross Wt.: 2230 lbs
Time Since Last Inspection: 96 Hours
Engines: 1 Reciprocating
Airframe Total Time: 3305.2 Hours at time of accident
Engine Manufacturer: LYCOMING
ELT: C91  installed, not activated
Engine Model/Series: O-435
Registered Owner: EAGLES NEST MOTEL AND CAR RENTAL
Rated Power: 175 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: PAHN, 16 ft msl
Observation Time: 1954 UTC
Distance from Accident Site: 0 Nautical Miles
Direction from Accident Site: 97°
Lowest Cloud Condition: Clear
Temperature/Dew Point: 21°C / 14°C
Lowest Ceiling: None
Visibility: 10 Miles
Wind Speed/Gusts, Direction: 3 knots, 150°
Visibility (RVR): 
Altimeter Setting:  29.9 inches Hg
Visibility (RVV):
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Skagway, AK (SKG)
Type of Flight Plan Filed: None
Destination: Haines, AK (HNS)
Type of Clearance: None
Departure Time: 1200 AKD
Type of Airspace: Class G

Airport Information

Airport: HAINES (HNS)
Runway Surface Type: Asphalt
Airport Elevation: 15 ft
Runway Surface Condition: Dry
Runway Used: 26
IFR Approach: None
Runway Length/Width: 4000 ft / 100 ft
VFR Approach/Landing: Full Stop; Traffic Pattern 

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: 3 None
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 4 None

Latitude, Longitude:  59.243889, -135.523611 (est)

NTSB Identification: ANC16LA048
14 CFR Part 91: General Aviation
Accident occurred Monday, July 18, 2016 in Haines, AK
Aircraft: STINSON 108 2, registration: N343C
Injuries: 4 Uninjured.

This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.


On July 18, 2016, about 1230 Alaska daylight time, a tailwheel-equipped Stinson 108 airplane, N343C, sustained substantial damage following a structural failure of the left main landing gear during the landing rollout at Haines Airport, Haines, Alaska. The certificated private pilot, and three passengers were not injured. The airplane was registered to and operated by the pilot, as a visual flight rules (VFR) personal flight, under the provisions of 14 Code of Federal Regulations (CFR) Part 91. Visual meteorological conditions prevailed at the time of the accident and no flight plan was filed. The flight had departed Skagway, Alaska about 1200, destined for Haines.


During an interview with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) on July 18, 2016, the pilot stated that he was flying three of his family members home to Haines from Skagway. Wind at the Haines Airport was reported to be a left quartering tailwind of less than 4 knots. The pilot performed a normal landing on runway 26 with the intent of exiting the runway via a right turn onto taxiway "B". About 100 feet prior to the taxiway, while at an estimated speed of 20 mph, the airplane turned unexpectedly to the right and made a rapid 180 degree turn. The pilot applied left brake pressure but the right turn continued. About halfway through the turn, the pilot felt two lurching events in succession and then felt the left main landing gear fold up under the aircraft. The left wing and propeller struck the runway surface and the airplane collapsed onto the left side of fuselage. The pilot stated that there were no environmental or performance issues that should have precipitated a ground loop. The airplane sustained substantial damage to the left wing, left lift strut and lower fuselage. 


A postaccident examination by the pilot revealed that the left landing gear leg separated in two places with the first near the axle and the second near the upper shock strut attachment points. The left wheel separated from the assembly and both the wheel assembly and axle were located about 10 feet in front of the propeller. Photographic evidence revealed extensive corrosion on the inner sleeve of the fractured axle. 


A subsequent inspection of runway 26 revealed 2 lines of black tire marks that were consistent with a right turn during braking action. An estimated 25-foot-long ground scar was consistent with bare metal scraping that trailed from about 110 degrees magnetic, prior to the final airplane resting location.


The axle and hub assembly have been retained and a detailed examination is pending. 



The closest weather reporting facility is Haines Airport, Haines, Alaska. At 1154, an aviation routine weather report (METAR) from the Haines Airport was reporting in part: wind from 150 degrees at 3 knots; sky condition, clear; visibility, 10 statute miles; temperature 70 degrees F; dew point 57 degrees F; barometric pressure 29.90inHG.
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HAINES, Alaska (KTUU) A non-injury plane crash caused the Haines Airfield to close for about an hour and a half Monday, according to Alaska State Troopers.

Troopers observed the small, apparently damaged plane 12:25 p.m. and contacted the pilot and passengers, according to a dispatch posted online. While no one was hurt, pilot Shane Horton told troopers that the landing gear had buckled during landing. The wing and prop struck the ground.


The FAA, National Transportation Safety Board and state Transportation Department were notified, and the plane was photographed before removal from the runway, troopers wrote. The plane is a Stinson 108-2, according to FAA records.

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