# NTSB WPR24LA318: Cessna 172S, N513WF, Seattle, WA, September 21, 2024

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Final report
- Date: September 20, 2024, 20:23 local (Sep 21, 2024, 03:23 UTC)
- Place: Seattle, WA · Airport environment
- Coordinates: 47.529972, -122.30194 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.5300&lon=-122.3019&mi=10
- Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping)
- Defining events: [Standing-engine(s) operating: Ground collision](https://openairdocs.org/ntsb-events/200); [Taxi-from runway: Ground collision](https://openairdocs.org/ntsb-events/200)
- Highest injury: No injuries
- Injuries: 5 uninjured
- Status: Completed
- Report: Approved by Office Director
- Investigation class: Class 4 - Basic report with no Prelim publish
- NTSB office: Western Pacific Region
- Parties: Federal Aviation Administration
- NTSB case key (mKey): 195229
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR24LA318
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/195229/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=195229
- Page: https://openairdocs.org/ntsb/WPR24LA318

## Probable cause (aircraft 1)

The Gulfstream pilot’s failure to maintain clearance from the Cessna while taxiing that resulted in a ground collision.

## Findings

NTSB's coded findings; those marked are part of the probable cause.

- [Attention/monitoring: monitoring other aircraft](https://openairdocs.org/ntsb-findings/02021540): Personnel issues › Psychological · Pilot of other aircraft (probable cause), aircraft 1; cases with it: [Cessna 172S, 12 cases](https://openairdocs.org/ntsb-findings/02021540/cases.md?model=2072439), [All aircraft, 231 cases](https://openairdocs.org/ntsb-findings/02021540/cases.md)
- [Attention/monitoring: monitoring other aircraft](https://openairdocs.org/ntsb-findings/02021540): Personnel issues › Psychological · Pilot (probable cause), aircraft 2; cases with it: [Iai GULFSTREAM G280, 1 case](https://openairdocs.org/ntsb-findings/02021540/cases.md?model=4500314), [All aircraft, 231 cases](https://openairdocs.org/ntsb-findings/02021540/cases.md)

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Standing-engine(s) operating: Ground collision](https://openairdocs.org/ntsb-events/200) (defining event), aircraft 1; cases with it: [Cessna 172S, 23 cases](https://openairdocs.org/ntsb-events/200/sequence.md?model=2072439), [All aircraft, 618 cases](https://openairdocs.org/ntsb-events/200/sequence.md)
- [Taxi-from runway: Ground collision](https://openairdocs.org/ntsb-events/200) (defining event), aircraft 2; cases with it: [Iai GULFSTREAM G280, 1 case](https://openairdocs.org/ntsb-events/200/sequence.md?model=4500314), [All aircraft, 618 cases](https://openairdocs.org/ntsb-events/200/sequence.md)

## Analysis (aircraft 1)

The ground collision occurred as one airplane (Cessna 172) was situated in the runup area, and another airplane (Gulfstream G280) was taxiing to a fixed based operator (FBO). The Gulfstream had landed and passed the turn for the FBO and was instructed by the ground controller to turn 180° and taxi to the FBO. The pilots of both airplanes were aware of each other and confirmed they had each other in sight. As the Gulfstream taxied past the Cessna, the right wing of the Gulfstream struck the left wing of the Cessna, which resulted in substantial damage to the left wing and aileron. The Gulfstream sustained minor damage to the right winglet leading edge. Both pilots reported that there were no preaccident mechanical malfunctions or failures with the airplanes that would have precluded normal operation.

## Aircraft 1

- Registration: [N513WF](https://openairdocs.org/aircraft/N513WF), registered now, S/N 172S9756, built 2004 (OpenAirDocs)
- Reported make and model: CESSNA 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (registry code 2072439) (OpenAirDocs)
- Registry engine: [Lycoming IO-360-L2A](https://openairdocs.org/engine/lycoming-io-360-l2a) (registry code 41597, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 172S9756
- Year built: 2004
- Airframe hours: 10804
- Engines: Lycoming IO-360-L2A 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Galvin Flying
- Registered owner: Meow Meow LLC
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, September 4, 2024, 48 hours before
- Airport: BFI, Boeing Fld/King County Intl
- Equipment: Auto-pilot, Angle of attack indicator, ADS-B, Stall warning system, Electronic primary flight display, Electronic multifunction display, Electronic flight bag or handheld device

## Aircraft 2

- Registration: [N621WK](https://openairdocs.org/aircraft/N621WK), registered now, S/N 2179, built 2019 (OpenAirDocs)
- Reported make and model: IAI LTD GULFSTREAM G280
- Registry model: [Iai GULFSTREAM G280](https://openairdocs.org/model/iai-gulfstream-g280) (registry code 4500314) (OpenAirDocs)
- Registry engine: [Honeywell AS907-2-1G](https://openairdocs.org/engine/honeywell-as907-2-1g) (registry code 33400, turbo-fan) (OpenAirDocs)
- Category: Airplane
- Serial number: 2179
- Year built: 2019
- Airframe hours: 948
- Engines: HONEYWELL AS907-2-1G 7765 lbs thrust turbo fan; HONEYWELL AS907-2-1G 7765 lbs thrust turbo fan
- Damage: Minor damage
- Flight: Executive/Corporate, Part 91
- Operator: Kellanova
- Registered owner: Kellanova
- Airworthiness certificate: Standard, Normal
- Last inspection: Continuous airworthiness, August 23, 2024, 233 hours before
- Departed: PWK, Wheeling, IL
- Destination: Same as departure
- Flight plan: IFR
- Equipment: ADS-B, Angle of attack indicator, Auto-pilot, Data recorder, Electronic flight bag or handheld device, Electronic multifunction display, Electronic primary flight display, Heads up display, Onboard weather, Stall warning system

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot, aircraft N513WF; age 31; injuries: none; private; airplane ratings: single-engine land; medical: class 1, with waivers/limitations; last flight review May 10, 2024; seat: left; restraint: 3-point; flight hours: 139.7 total, 34.3 in this make and model, 40.7 as pilot in command, 21.2 in the last 90 days, 18.5 in the last 30 days, 1.4 in the last 24 hours
- Pilot, aircraft N621WK; age 51; injuries: none; airline transport, private, commercial; airplane ratings: multi-engine sea, single-engine sea, multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, with waivers/limitations; last flight review August 5, 2024; seat: left; restraint: 5-point; flight hours: 5,668 total, 256 in this make and model, 5,066 as pilot in command, 105 in the last 90 days, 48 in the last 30 days, 5 in the last 24 hours
- Co-pilot, aircraft N621WK; age 40; injuries: none; airline transport; airplane ratings: single-engine sea, multi-engine land, single-engine land; instrument ratings: helicopter, airplane; medical: class 1, with waivers/limitations; last flight review August 31, 2024; seat: right; restraint: 5-point; flight hours: 6,290 total, 7 in this make and model, 2,962 as pilot in command, 59 in the last 90 days, 10 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night
- Wind: calm
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 61 °F, dew point 48 °F
- Altimeter: 30.19 inHg
- Observed at: KBFI, 1 nm away
- METAR: METAR KBFI 210353Z 00000KT 10SM SCT200 16/09 A3019 RMK AO2 SLP224 T01560089=

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Incident 20240921020482I](https://openairdocs.org/incident/20240921020482I), Sep 21, 2024: Cessna 172S, Seattle, WA, Minor damage. At this time the second aircraft information unknown. The Cessna was parked in the run-up area. The left wing of the Cessna was struck by the right-wing a gulf…

## Other investigations on N513WF (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB WPR21LA303](https://openairdocs.org/ntsb/WPR21LA303), Jun 11, 2021: Cessna 172S (N513WF), Yelm, WA, substantial damage. Probable cause: A total loss of engine power for reasons that could not be determined based on the available evidence.

## Docket (4 files)

The files NTSB released with the investigation on April 22, 2025, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=195229. 17.7 MB in all.

- N513WF pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 10 pages, 1.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=18481866&FileExtension=pdf&FileName=N513WF%206120_Redacted-Rel.pdf
- N621WK pilot/operator aircraft accident report, NTSB form 6120.1 (item 2, PDF, 10 pages, 1.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=18482653&FileExtension=pdf&FileName=N621WK%206120_Redacted-Rel.pdf
- Photos - courtesy of the FAA (item 3, PDF, 9 pages, 13.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=18482252&FileExtension=pdf&FileName=PhotosN621WK1%20FAA-Rel.pdf
- Airport report (item 4, PDF, 5 pages, 308 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=18482262&FileExtension=pdf&FileName=Aircraft%20Vs%20Aircraft%209.20.24_Redacted-Rel.pdf

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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