Saturday, January 5, 2019

Cessna T210L Turbo Centurion, N2122S: Accident occurred January 02, 2018 at Aurora State Airport (KUAO), Marion County, Oregon

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

Additional Participating Entity:

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

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/N2122S



Location: Aurora, OR
Accident Number: WPR18LA057
Date & Time: 01/02/2018, 0905 PST
Registration: N2122S
Aircraft: CESSNA T210L
Aircraft Damage: Substantial
Defining Event: Landing gear collapse
Injuries: 1 None
Flight Conducted Under: Part 91: General Aviation - Personal

Analysis 

The private pilot was conducting a cross-country flight. He reported that, while on the downwind leg preparing to land, he activated the landing gear extension lever but that the green DOWN and LOCKED light did not illuminate. The pilot thought that the landing gear was down but performed a fly-by near the air traffic control tower so that the controller could verify the position of the gear. The controller told the pilot that the landing gear appeared to be down. The controller then cleared the pilot for a second downwind approach and landing. The pilot stated that, while preparing to land a second time, he attempted to raise and lower the landing gear, but the green DOWN and LOCKED light again did not illuminate. The pilot looked in the airplane's landing gear mirror and saw that the gear appeared to be in the down position. During the landing roll, the right main landing gear collapsed, which resulted in substantial damage on the right side of the airplane. The pilot indicated that he had forgotten to perform the alternate landing gear extension procedure before landing, which is used when the gear will not lock into the down position.

A postaccident examination of the landing gear system, which included multiple gear retraction and extension cycles with the gear locked, revealed no anomalies that would have precluded normal operation. The right main landing gear collapsed because it did not lock into place, most likely due to the overcenter drag brace not fully attaining the overcenter position. 

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
A collapse of the right main landing gear during the landing roll because the gear would not lock into place. Contributing to the accident was the pilot's failure to perform the alternate landing gear extension procedure before landing.

Findings

Aircraft
Main landing gear - Incorrect use/operation (Cause)
Gear extension and retract sys - Not used/operated (Factor)

Personnel issues
Forgotten action/omission - Pilot (Factor)
Use of checklist - Pilot (Factor)

Factual Information 

On January 2, 2018, about 0920 Pacific standard time, a Cessna T210L airplane, N2122S, was substantially damaged during landing following a right main landing gear collapse at Aurora State Airport (UAO), Aurora, Oregon. The private pilot was not injured. The airplane was registered to and operated by the pilot as a Title 14 Code of Federal Regulations Part 91 personal flight. Visual meteorological conditions prevailed at the time of the accident and no flight plan was filed. The cross-country flight originated from Paine Field (PAE), Everett, Washington, about 0758, and was destined for Aurora.

In a report submitted to the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), the pilot reported that while on downwind for runway 35 at UAO, he activated the landing gear extension lever, which was followed by the orange light going out, however, the green [down and locked] light did not illuminate. The pilot further reported that the gear appeared to be down. He then requested permission to perform a control tower fly-by, so the controller could observe the position of the landing gear; the controller confirmed that the landing gear appeared to be down, followed by clearing the pilot for a left downwind approach and landing. The pilot stated that while on downwind he attempted to raise and lower the landing gear, however, while the orange light would illuminate, the green light would not. The pilot opined that the gear appeared to be down as viewed from the airplane's landing gear mirror. Shortly after touchdown the right main landing gear collapsed, which was followed by the airplane swerving right and into the runway safety area. The airplane came to rest on its left main landing gear, nose gear and right wing tip. The right horizontal stabilizer and elevator sustained substantial damage. The pilot also mentioned that he forgot to perform the alternate landing gear extension procedure prior to landing.

Under the supervision of a Federal Aviation Administration aviation safety inspector, a postaccident examination of the landing gear system was performed on January 8, 2018, at the facilities of Willamette Aviation, Aurora State Airport, Aurora, Oregon. The results of the examination revealed the following:

The landing gear hydraulic lines, electrical wires, actuators, locks, valves and other landing gear system components were visually inspected, with no anomalies noted.

The hydraulic system fluid was visually inspected, with the level of the fluid above the ADD mark as indicated on the reservoir dip stick. There were no obvious hydraulic leaks observed from any specific hydraulic component.

The landing gear switch handle was in the GEAR DOWN position, and all three landing gear were visually and physically confirmed to be in the DOWN and LOCKED positions. The landing gear down lock actuators were both extended, and the locks themselves were over the lock pins in a position appropriate to "locked" in the down position, and with visually confirmed engagement.

With the airplane position on the ground and resting on its landing gear, the green GEAR DOWN indicator illuminated when the master switch was positioned to ON; the hydraulic power pack ran for about one (1) second before the light came on.

The airplane was jacked using tripod jacks, wing-mounted jack adapters, and a weighted tail stand. The landing gear was retracted and extended eight (8) cycles over a period of about 40 minutes, and functioned as described in the Cessna T210L maintenance manual, with positive down lock engagement. A green GEAR DOWN light indication was followed by the hydraulic pump shutting off. Both retraction and extension cycles were completed in approximately eight (8) seconds. Each of the cycles resulted in a normal gear retraction and extension cycle completion, with only slight increases in cycle times when the landing gear was de-synchronized by application of resistance to one or the other gear legs. The landing gear warning horn system was tested for proper operation, with no anomalies noted during the functionality check. All systems operated normally. The examination revealed no evidence of what precipitated the collapse of the right main landing gear during the landing roll. (For an in-depth description of the examination and testing, refer to the Aircraft and Landing Gear System Inspection/Function Report, which is appended to the docket for this report.)



History of Flight

Landing-landing roll
Landing gear collapse (Defining event)

Pilot Information

Certificate: Private
Age: 78, Male
Airplane Rating(s): Multi-engine Land; Single-engine Land
Seat Occupied: Left
Other Aircraft Rating(s): None
Restraint Used: 3-point
Instrument Rating(s): Airplane
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Class 3 With Waivers/Limitations
Last FAA Medical Exam: 12/02/2016
Occupational Pilot: No
Last Flight Review or Equivalent: 04/28/2017
Flight Time:  2201 hours (Total, all aircraft), 1673 hours (Total, this make and model), 2018 hours (Pilot In Command, all aircraft), 17 hours (Last 90 days, all aircraft), 6 hours (Last 30 days, all aircraft), 1 hours (Last 24 hours, all aircraft)



Aircraft and Owner/Operator Information

Aircraft Make: CESSNA
Registration: N2122S
Model/Series: T210L M
Aircraft Category: Airplane
Year of Manufacture: 1975
Amateur Built: No
Airworthiness Certificate: Normal
Serial Number: 21061084
Landing Gear Type: Retractable - Tricycle
Seats: 6
Date/Type of Last Inspection: 05/02/2017, Annual
Certified Max Gross Wt.: 3800 lbs
Time Since Last Inspection: 62 Hours
Engines: 1 Reciprocating
Airframe Total Time: 4803.8 Hours at time of accident
Engine Manufacturer: Continental Motors, Inc.
ELT:
Engine Model/Series: TSIO-520
Registered Owner: On file
Rated Power: 285 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: UAO, 200 ft msl
Distance from Accident Site:
Observation Time: 0948 PST
Direction from Accident Site:
Lowest Cloud Condition: Clear
Visibility:  10 Miles
Lowest Ceiling: None
Visibility (RVR):
Wind Speed/Gusts: Calm /
Turbulence Type Forecast/Actual: / None
Wind Direction:
Turbulence Severity Forecast/Actual: /
Altimeter Setting: 30.35 inches Hg
Temperature/Dew Point: 2°C / -1°C
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Everett, WA (PAE)
Type of Flight Plan Filed: None
Destination: Aurora, OR (KUAO)
Type of Clearance: VFR Flight Following
Departure Time: 0758 PST
Type of Airspace: Class D

Airport Information

Airport: Aurora State Airport (KUAO)
Runway Surface Type: Asphalt
Airport Elevation: 200 ft
Runway Surface Condition: Dry
Runway Used: 35
IFR Approach: None
Runway Length/Width: 5003 ft / 100 ft
VFR Approach/Landing: Traffic Pattern

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: 45.247222, -122.770000

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