Cessna 172S and Iai LTD GULFSTREAM G280 accident near Seattle, Washington, September 21, 2024
On September 21, 2024 at about 3:23 am local time, 2 aircraft, Cessna 172S (N513WF) and Iai LTD GULFSTREAM G280 (N621WK), were involved in the same accident near Seattle, Washington (Boeing Fld/King County Intl airport). No one was hurt; 5 people were on board or involved. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
The Gulfstream pilot’s failure to maintain clearance from the Cessna while taxiing that resulted in a ground collision.
The Gulfstream pilot’s failure to maintain clearance from the Cessna while taxiing that resulted in a ground collision.
Source: NTSB aviation accident database, copy made November 2, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- September 21, 2024 · about 3:23 am local time · cases in 2024
- Place
- Seattle, Washington · Boeing Fld/King County Intl · cases near this airport · map
- Type
- Accident · collision on the ground
- Injuries
- No one was hurt; 5 people were on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft 1
- Cessna 172S, built 2004 · all 172Ss on the register
- Registration
- N513WF · registry record · serial 172S9756
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
- Aircraft 2
- Iai LTD GULFSTREAM G280, built 2019 · all GULFSTREAM G280s on the register
- Registration
- N621WK · registry record · serial 2179
- Damage
- Minor damage
- Flight
- Executive or corporate flight · general aviation rules (Part 91)
The NTSB's narrative for the Cessna 172S final · quoted from the NTSB record
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.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The NTSB's narrative for the Iai LTD GULFSTREAM G280 final · quoted from the NTSB record
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.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record for the Cessna 172S from the NTSB's investigation tables, in plain English
What happened, in order
- Ground collision during standing (engine(s) operating) defining event
The NTSB's findings
- Personnel issues › Psychological › Attention/monitoring › Monitoring other aircraft › Pilot of other aircraft
Pilot
- Certificate: private
- Ratings: single-engine land
- Flight time: 139.7 hours in all; 34.3 in this make and model; 21.2 in the last 90 days; 18.5 in the last 30 days; 40.7 as pilot in command
- Last flight review: May 10, 2024
- Medical certificate: Class 1 (with waivers/limitations)
- Seat: left
- Injury: no injuries
The aircraft
- Airframe total time: 10,804 hours
- Last inspection: 100-hour inspection, September 4, 2024; 48 hours since
- Maximum gross weight: 2,558 lb
- Seats: 4
- Landing gear: fixed
- Engine: Lycoming IO-360-L2A (piston); 5,476 hours total
The flight
- Flight plan: none
Weather at the time
- Light: night
- Visibility: 10 statute miles
- Sky: scat at 20,000 ft
- Temperature: 61°F (16°C), dew point 48°F (9°C)
- Altimeter: 30.19 inHg
- Observation at 8:53 pm from KBFI, 1 miles away
Weather report (METAR): METAR KBFI 210353Z 00000KT 10SM SCT200 16/09 A3019 RMK AO2 SLP224 T01560089=
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Flight crew | 1 |
The factual record for the Iai LTD GULFSTREAM G280 from the NTSB's investigation tables, in plain English
What happened, in order
- Ground collision during taxi (from runway)
The NTSB's findings
- Personnel issues › Psychological › Attention/monitoring › Monitoring other aircraft › Pilot
Pilot
- Certificate: airline transport pilot, commercial pilot, private
- Ratings: multi-engine land; multi-engine sea; single-engine land; single-engine sea; instrument: airplane; rotorcraft: glider
- Flight time: 5,668 hours in all; 256 in this make and model; 105 in the last 90 days; 48 in the last 30 days; 5,066 as pilot in command
- Last flight review: August 5, 2024
- Medical certificate: Class 1 (with waivers/limitations)
- Seat: left
- Injury: no injuries
Co-pilot
- Certificate: airline transport pilot
- Ratings: multi-engine land; single-engine land; single-engine sea; instructor: airplane multi-engine; instructor: airplane single-engine; instructor: instrument airplane; instrument: airplane; instrument: helicopter; rotorcraft: helicopter
- Flight time: 6,290 hours in all; 7 in this make and model; 59 in the last 90 days; 10 in the last 30 days; 2,962 as pilot in command; 793 on instruments
- Last flight review: August 31, 2024
- Medical certificate: Class 1 (with waivers/limitations)
- Seat: rgt
- Injury: no injuries
The aircraft
- Airframe total time: 948 hours
- Last inspection: continuous airworthiness programme, August 23, 2024; 233 hours since
- Maximum gross weight: 39,750 lb
- Seats: 13
- Landing gear: retractable
- Engine 3: Honeywell AS907-2-1G (turbofan); 0 hours total
- Engine 4: Honeywell AS907-2-1G (turbofan); 948 hours total
The flight
- Departed from: PWK Wheeling IL at 11:25 pm
- Flight plan: IFR
- A second pilot was aboard
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Flight crew | 2 | |||
| Passengers | 2 |
Photographs from the investigation 9 pictures from the NTSB's docket, as the NTSB released them
The NTSB's photographs with the NTSB's captions, at screen size. Open a picture to see it full size or to report one that should not be shown.
Documents from the investigation the NTSB's docket: the evidence folder behind the report
4 documents, released by the NTSB on April 22, 2025. View them here, or download them; the NTSB redacts some personal details before release, and this site shows the NTSB's own titles rather than its file names.
| # | Document | What it is | |
|---|---|---|---|
| 1 | N513WF Pilot/operator Aircraft Accident Report, NTSB Form 6120.1 | PDF, 10 pages | View Download |
| 2 | N621WK Pilot/operator Aircraft Accident Report, NTSB Form 6120.1 | PDF, 10 pages | View Download |
| 3 | Photos - Courtesy of the FAA | PDF, 9 pages · our copy | View Download |
| 4 | Airport Report | PDF, 5 pages | View Download |
The same docket at the NTSB · documents without a copy here are fetched from the NTSB when you open them.
Other NTSB records under N513WF the same tail number, which may have belonged to a different aircraft at the time
Connections how this case links to the rest of the register
- N513WF on the register today · the tail number may have moved to another aircraft since
- Cessna 172 Skyhawk 20,693 registered today · the model family and its accident history
- Cessna 72,678 aircraft on the register
- N621WK on the register today · the tail number may have moved to another aircraft since
- Iai Ltd GULFSTREAM G280 294 registered today · the model family and its accident history
- Engine: Lycoming IO-360-L2A 2,651 aircraft carry this series today · as the NTSB recorded it
- Engine: Honeywell AS907-2-1G 267 aircraft carry this series today · as the NTSB recorded it
- Boeing Fld/King County International · nearest airport
- Chicago Executive · departed from
- Accidents and incidents in Washington 2,713 since 1982 · 361 in the last ten years
- Washington 10,664 aircraft registered
- Other NTSB records under N513WF 1 records · the number may have belonged to another aircraft at the time
The whole map of how records connect · these connections as data: /graph/accident/WPR24LA318.json.
The bigger picture in Aviation Analytics: accidents over time since 1982, by model, by phase of flight and conditions, by place and on the map.
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text does not name anyone involved, its policy at this time. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.