Grumman Acft Eng Cor-Schweizer G-164B accident near Vernalis, California, March 3, 2023
On March 3, 2023 at about 8:30 pm local time, a 1976 Grumman Acft Eng Cor-Schweizer G-164B, registered N48492, was substantially damaged in an accident during maneuvering (low-alt flying) near Vernalis, California. It was an aerial application (crop spraying) flight under agricultural flying rules (Part 137). 1 person was seriously injured. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
The pilot’s failure to maintain clearance from a power line during a low-level aerial application flight.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- March 3, 2023 · about 8:30 pm local time
- Place
- Vernalis, California · map
- Type
- Accident
- Injuries
- 1 person was seriously injured.
- Weather
- visual conditions (good weather)
- Aircraft
- Grumman Acft Eng Cor-Schweizer G-164B, built 1976 · all G-164Bs on the register
- Registration
- N48492 · registry record · serial 47B
- Damage
- Substantial damage
- Flight
- Aerial application (crop spraying) flight · agricultural flying rules (Part 137)
The NTSB's narrative final · quoted from the NTSB record
The pilot reported he was spraying near power lines during an aerial application flight. He made several passes beneath a power line; however, during a subsequent pass, the pilot became distracted and struck the power line. The airplane impacted the ground and was destroyed by post-crash fire. The pilot reported no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operations.
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 from the NTSB's investigation tables, in plain English
What happened, in order
- Collision with terrain or object (not controlled flight into terrain) during maneuvering (low-alt flying)
- Low altitude operation/event during maneuvering (low-alt flying) defining event
The NTSB's findings
- Personnel issues › Psychological › Attention/monitoring › Monitoring environment › Pilot
- Environmental issues › Physical environment › Object/animal/substance › Wire › Effect on equipment
- Environmental issues › Physical environment › Object/animal/substance › Wire › Awareness of condition
Pilot
- Certificate: flight instructor, commercial pilot
- Ratings: single-engine land; instructor: airplane single-engine; instrument: airplane
- Flight time: 17,000 hours in all; 16,000 in this make and model; 50 in the last 90 days; 30 in the last 30 days; 15,000 as pilot in command
- Last flight review: April 22, 2021
- Medical certificate: Class 2 (without waivers/limitations)
- Seat: sngl
- Injury: serious injuries
The aircraft
- Last inspection: annual inspection; 200 hours since
- Maximum gross weight: 5,000 lb
- Seats: 1
- Landing gear: fixed
- Engine: Pratt & Whitney 1340/an-1 (turboprop); 11,874 hours total
- Fire on the ground
The flight
- Departed from: CA67 Vernalis CA at 8:10 pm
- Flight plan: none
Weather at the time
- Light: daylight
- Wind: from 270° at 9 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 55°F (13°C), dew point 39°F (4°C)
- Altimeter: 30.01 inHg
- Observation at 12:53 pm from KMOD, 13 miles away
Weather report (METAR): KMOD 032053Z 27009KT 10SM CLR 13/04 A3001 RMK AO2 SLP161 T01330044 58026
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Flight crew | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
3 documents, released by the NTSB on June 23, 2023. 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 | Pilot/operator Aircraft Accident Report, NTSB Form 6120.1 | PDF, 11 pages | View Download |
| 2 | Photos | PDF, 1 page | View Download |
| 3 | Pilot's Statement | PDF, 1 page | View Download |
The same docket at the NTSB · documents without a copy here are fetched from the NTSB when you open them.
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 never names anyone involved. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.