Schweizer Aircraft Corp. G-164B accident near Richvale, California, June 7, 2004
On June 7, 2004 at about 2:30 pm local time, a Schweizer Aircraft Corp. G-164B, registered N3626T, was substantially damaged in an accident near Richvale, California (Private Airstrip airport). It was an aerial application (crop spraying) flight under agricultural flying rules (Part 137). No one was hurt; 1 person was on board or involved. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
the loss of engine power during takeoff due to the engine's deteriorated fuel control unit's inner drive shaft bearing. The reason for the bearing's deteriorated condition could not be determined.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- June 7, 2004 · about 2:30 pm local time
- Place
- Richvale, California · Private Airstrip · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Schweizer Aircraft Corp. G-164B
- Registration
- N3626T · no longer on the register · serial 722B
- 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 agricultural airplane experienced a slow and subtle loss of engine power shortly after lifting off the dirt airstrip as it departed for an aerial application flight. The pilot placed the fuel lever to flight idle and ensured the power lever was full forward; however, he was unable to dump the application load prior to impacting a dirt embankment. Post-accident examination of the engine revealed it was rotating at the time of impact; however, the power output may have been lower than that required to sustain flight. The only anomaly noted with the engine and its various components that could have resulted in the loss of engine power was a spalled and deteriorated inner drive bearing of the fuel control unit (FCU), which could result in fluctuations in torque. The bearing grease had deteriorated to a point that only grease residue was present. The reason for the bearing grease deterioration and bearing deterioration is unknown. At the time of the accident, the FCU was 53 hours short of its recommended inspection period.
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
Pilot
- Certificate: commercial pilot
- Ratings: multi-engine land; single-engine land; single-engine sea; instrument: airplane; rotorcraft: helicopter
- Flight time: 8,700 hours in all; 380 in this make and model
- Last flight review: November 1, 2002
- Medical certificate: Class 2 (without waivers/limitations)
- Seat: sngl
- Injury: no injuries
The aircraft
- Airframe total time: 7,859.4 hours
- Last inspection: annual inspection, July 1, 2003; 625.9 hours since
- Seats: 1
- Landing gear: fixed
- Engine: Pratt & Whitney Canada PT6A-34 (turboprop); 0 hours total
- Operator: Av Ag, Inc.
The flight
- Departed from: 07CL Richvale CA at 2:30 pm
- Flight plan: none
Weather at the time
- Light: daylight
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 167°F (75°C), dew point 0°F (-18°C)
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
Other NTSB records under N3626T the same tail number, which may have belonged to a different aircraft at the time
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.