Saturday, May 18, 2019

Birdstrike: Southwest Airlines, Boeing 737-700, N249WN; accident occurred March 27, 2019 near Berry-Nashville International Airport (KBNA), Tennessee

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

https://registry.faa.gov/N249WN

Location: Nashville, TN
Accident Number: DCA19CA130
Date & Time: 03/27/2019, 1925 CDT
Registration: N249WN
Aircraft: Boeing 737
Aircraft Damage: Substantial
Defining Event: Birdstrike
Injuries:N/A 
Flight Conducted Under: Part 121: Air Carrier - Scheduled

Analysis 

On March 27, 2019 at 7:25pm central daylight time (EDT), a Boeing 737-700, N249WN, operated by Southwest Airlines as flight 975 struck a bird with the left horizontal stabilizer while descending through 2,500 feet on approach to the Berry-Nashville International Airport (KBNA), Nashville, Tennessee. The airplane landed at KBNA with no further incident. There were no injuries and the airplane was substantial damaged. The regularly scheduled passenger flight was operating under the provisions of 14 CFR Part 121 from the Pittsburgh International Airport (KPIT), Pittsburgh, Pennsylvania, to KBNA.

Damage to the airplane included a 12 inch crack in the forward spar, requiring replacement of the horizontal stabilizer. Bird residue was sent to the Smithsonian Museum of Natural History laboratory, and identified as a Great Blue Heron.

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
a collision with a bird.

Findings

Environmental issues
Animal(s)/bird(s) - Effect on equipment (Cause)

Factual Information

History of Flight

Approach
Birdstrike (Defining event) 

Pilot Information

Certificate: Airline Transport; Flight Engineer
Age: 56
Airplane Rating(s): Multi-engine Land; Single-engine Land
Seat Occupied: Left
Other Aircraft Rating(s): None
Restraint Used: 5-point
Instrument Rating(s): Airplane
Second Pilot Present: Yes
Instructor Rating(s): None
Toxicology Performed:
Medical Certification: Class 1 With Waivers/Limitations
Last FAA Medical Exam: 01/13/2019
Occupational Pilot: Yes
Last Flight Review or Equivalent: 08/16/2018
Flight Time:  23718 hours (Total, all aircraft), 15630 hours (Total, this make and model), 14771 hours (Pilot In Command, all aircraft), 154 hours (Last 90 days, all aircraft), 62 hours (Last 30 days, all aircraft), 2.5 hours (Last 24 hours, all aircraft)

Co-Pilot Information

Certificate: Airline Transport; Flight Instructor; Commercial
Age: 33
Airplane Rating(s): Multi-engine Land; Single-engine Land
Seat Occupied: Right
Other Aircraft Rating(s): 
Restraint Used: 5-point
Instrument Rating(s): Airplane
Second Pilot Present: Yes
Instructor Rating(s): Airplane Single-engine; Instrument Airplane
Toxicology Performed:
Medical Certification: Class 1 Without Waivers/Limitations
Last FAA Medical Exam: 02/12/2019
Occupational Pilot: Yes
Last Flight Review or Equivalent: 02/18/2019
Flight Time: 4988 hours (Total, all aircraft), 1317 hours (Total, this make and model), 1128 hours (Pilot In Command, all aircraft), 161 hours (Last 90 days, all aircraft), 61 hours (Last 30 days, all aircraft), 0 hours (Last 24 hours, all aircraft) 

Aircraft and Owner/Operator Information

Aircraft Make: Boeing
Registration: N249WN
Model/Series:737 7H4 
Aircraft Category:Airplane 
Year of Manufacture:
Amateur Built: No
Airworthiness Certificate: Transport
Serial Number: 34951
Landing Gear Type: Retractable - Tricycle
Seats: 151
Date/Type of Last Inspection: 02/19/2019,
Certified Max Gross Wt.: 154500 lbs
Time Since Last Inspection:
Engines: 2 Turbo Fan
Airframe Total Time: 44455 Hours at time of accident
Engine Manufacturer: Cfm Intl
ELT: Installed
Engine Model/Series: CFM56-7B24
Registered Owner: Southwest Airlines Co
Rated Power: 10142 hp
Operator: Southwest Airlines
Operating Certificate(s) Held: Flag carrier (121)

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Night
Observation Facility, Elevation: KBNA
Distance from Accident Site: 10 Nautical Miles
Observation Time: 2353
Direction from Accident Site:
Lowest Cloud Condition: Scattered / 2500 ft agl
Visibility:  10 Miles
Lowest Ceiling:
Visibility (RVR):
Wind Speed/Gusts: 6 knots /
Turbulence Type Forecast/Actual:
Wind Direction: 210°
Turbulence Severity Forecast/Actual:
Altimeter Setting: 30.25 inches Hg
Temperature/Dew Point: 16°C / 2°C
Precipitation and Obscuration:
Departure Point: Pittsburgh, PA (KPIT)
Type of Flight Plan Filed: IFR
Destination: Nashville, TN (KBNA)
Type of Clearance: IFR
Departure Time: 1925 EDT
Type of Airspace: Class C

Airport Information

Airport: Nashville International Airpor (KBNA)
Runway Surface Type:
Airport Elevation: 599 ft
Runway Surface Condition: Unknown
Runway Used: N/A
IFR Approach: Visual
Runway Length/Width:
VFR Approach/Landing: 

Wreckage and Impact Information

Crew Injuries: N/A
Aircraft Damage: Substantial
Passenger Injuries: N/A
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: N/A
Latitude, Longitude: 36.124444, -86.678056

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