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).
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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 October 4, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- September 21, 2024 · about 3:23 am local time
- Place
- Seattle, Washington · Boeing Fld/King County Intl · 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 | |
|---|---|---|---|---|
| Flig | 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 | |
|---|---|---|---|---|
| Flig | 2 | |||
| Passengers | 2 |
Other NTSB records under N513WF the same tail number, which may have belonged to a different aircraft at the time
About this page
Everything above comes from the NTSB's public accident database: the narrative, probable cause and findings are the NTSB's own words, and the coded tables behind its report (pilot, aircraft, flight, weather, injuries, sequence of events) are written out in plain English. Pilots' ages, home towns and medical details are left out on purpose. The docket at the NTSB holds the report as a PDF and the investigation's photographs and documents. This site never names pilots, passengers or anyone else involved. A preliminary report describes what is known soon after the event and can change; the final report, with the probable cause, usually follows one to two years later and this page is refreshed when it does. Case number WPR24LA318.