Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Irving, Texas
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
Location: Waco, TX
Accident Number: CEN16LA356
Date & Time: 08/05/2016, 1700 CDT
Registration: N323DC
Aircraft: CESSNA P210N
Aircraft Damage: Substantial
Defining Event: Landing gear collapse
Injuries: 5 None
Flight Conducted Under: Part 91: General Aviation - Personal
Analysis
The airline transport pilot reported that the electrical system began to indicate a discharge condition during cruise flight and that he chose to divert to an intermediate airport. He lowered the wing flaps and landing gear, and then the airplane lost total electrical power. Landing gear extension seemed to be normal, which included a green down position indicator light and visual verification of the landing gear in the extended position. The pilot then conducted a visual approach to landing, and after landing, the right main landing gear (MLG) collapsed, which resulted in a runway excursion.
A postaccident examination of the electrical system revealed that the alternator was not functioning properly and that the voltage regulator was inoperative, which precipitated the diverted landing. Examination of the landing gear system revealed that the right MLG down-lock mechanism had failed. None of the components were provided to the National Transportation Safety Board for further examination, which precluded a determination of the root cause of the failure of the right MLG down-lock mechanism.
Probable Cause and Findings
The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The failure of the right main landing gear (MLG) down-lock mechanism, which resulted in the collapse of the landing gear. The root cause of the right MLG down-lock mechanism could not be determined because the components were not available for examination.
Findings
Aircraft
Gear extension and retract sys - Failure (Cause)
DC generator-alternator - Failure
DC regulator - Failure
Factual Information
On August 5, 2016, about 1700 central daylight time, a Cessna P210N airplane, N323DC, was substantially damaged when the landing gear collapsed during landing on runway 19 (7,107 feet by 150 feet, concrete) at the Waco Regional Airport (ACT), Waco, Texas. The pilot and four passengers onboard were not injured. The airplane was registered to and operated by the pilot under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed for the flight, which was operated on an instrument flight rules flight plan. The flight originated from the Dallas-Fort Worth International Airport (DFW) about 1630. The intended destination was the Austin-Bergstrom International Airport (AUS), Austin, Texas.
The pilot reported that the airplane electrical system began to indicate a discharge condition during cruise flight. He elected to divert to ACT. The wing flaps and landing gear were lowered before the airplane lost electrical power completely. Landing gear extension seemed to be normal, which included a green down position indicator light and visual verification of the landing gear in the extended position. He executed an uneventful visual approach and landing touchdown. However, after touching down, the landing gear collapsed. The airplane subsequently departed the left side of the runway before coming to rest.
A postaccident examination of the aircraft electrical system revealed that the alternator was not functioning properly and the voltage regulator was inoperative. Examination of the landing gear system revealed that the right main landing gear down lock mechanism had failed. None of the components were provided to the NTSB for further examination, which precluded any determination of the root cause of the failures. The alternator was repaired and the voltage regulator was replaced. The landing gear down lock mechanism was repaired. The airplane was subsequently returned to service and no further anomalies were reported to the NTSB.
History of Flight
Enroute-cruise
Electrical system malf/failure
Landing-flare/touchdown
Landing gear collapse (Defining event)
Runway excursion
Pilot Information
Certificate: Airline Transport
Age: 62, Male
Airplane Rating(s): Multi-engine Land; Single-engine Land
Seat Occupied: Left
Other Aircraft Rating(s): Gyroplane
Restraint Used: 3-point
Instrument Rating(s): Airplane
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Class 1 With Waivers/Limitations
Last FAA Medical Exam: 07/07/2016
Occupational Pilot: Yes
Last Flight Review or Equivalent: 04/25/2016
Flight Time: 12108 hours (Total, all aircraft), 110 hours (Total, this make and model), 2860 hours (Pilot In Command, all aircraft), 103 hours (Last 90 days, all aircraft), 22 hours (Last 30 days, all aircraft), 0 hours (Last 24 hours, all aircraft)
Aircraft and Owner/Operator Information
Aircraft Manufacturer: CESSNA
Registration: N323DC
Model/Series: P210N
Aircraft Category: Airplane
Year of Manufacture: 1979
Amateur Built: No
Airworthiness Certificate: Normal
Serial Number: P21000384
Landing Gear Type: Retractable - Tricycle
Seats: 6
Date/Type of Last Inspection: 09/08/2015, Annual
Certified Max Gross Wt.: 4000 lbs
Time Since Last Inspection: 110 Hours
Engines: 1 Reciprocating
Airframe Total Time: 6160 Hours as of last inspection
Engine Manufacturer: Continental Motors
ELT: C91 installed, not activated
Engine Model/Series: TSIO-520-P5
Registered Owner: On file
Rated Power: 310 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: KACT, 516 ft msl
Observation Time: 1651 CDT
Distance from Accident Site: 0 Nautical Miles
Direction from Accident Site: 360°
Lowest Cloud Condition: Clear
Temperature/Dew Point: 38°C / 18°C
Lowest Ceiling: None
Visibility: 10 Miles
Wind Speed/Gusts, Direction: 6 knots, Variable
Visibility (RVR):
Altimeter Setting: 29.9 inches Hg
Visibility (RVV):
Precipitation and Obscuration: No Obscuration; No Precipitation
Departure Point: Dallas-Ft Worth, TX (KDFW)
Type of Flight Plan Filed: IFR
Destination: Austin, TX (KAUS)
Type of Clearance: IFR
Departure Time: 1630 CDT
Type of Airspace: Class D
Airport Information
Airport: Waco Regional (KACT)
Runway Surface Type: Concrete
Airport Elevation: 516 ft
Runway Surface Condition: Dry
Runway Used: 19
IFR Approach: Visual
Runway Length/Width: 7107 ft / 150 ft
VFR Approach/Landing: Full Stop
Wreckage and Impact Information
Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: 4 None
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 5 None
Latitude, Longitude: 31.612222, -97.230278 (est)
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