Mooney M20F accident near Quincy, California, May 2, 1991
On May 2, 1991 at about 7:33 pm local time, a Mooney M20F, registered N9624M, was destroyed in an accident near Quincy, California. It was a personal flight under general aviation rules (Part 91). 4 people were killed. The weather was instrument conditions (cloud, fog or low visibility).
The NTSB's probable cause their words, unchanged
THE PILOT'S INADVERTENT FLIGHT INTO IMC AND THEREAFTER HIS FAILURE TO MAINTAIN DIRECTIONAL CONTROL OF HIS AIRPLANE. FACTORS WHICH CONTRIBUTED TO THE ACCIDENT RELATED TO THE PILOT'S IMPROPER WEATHER EVALUATION WHICH RESULTED IN HIS DELAYED EMERGENCY PROCEDURE, DISORIENTATION AFTER ENTERING CLOUDS AND RAIN, AND TO HIS LACK OF RECENT FLYING EXPERIENCE AND EXPERIENCE IN THE MODEL OF AIRPLANE.
Source: NTSB aviation accident database, copy made October 4, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- May 2, 1991 · about 7:33 pm local time
- Place
- Quincy, California · map
- Type
- Accident
- Injuries
- 4 people were killed.
- Weather
- instrument conditions (cloud, fog or low visibility)
- Aircraft
- Mooney M20F · all M20Fs on the register
- Registration
- N9624M · registry record · serial M20F
- Damage
- Destroyed
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
THE PLT PLANNED A NONSTOP FLT FM WA TO CA, & HE RECD PREFLT WEATHER BRIEFINGS SHOWING GENERALLY VFR CONDITIONS. ENROUTE, THE PLT AMENDED HIS ROUTE & LANDED AT KLAMATH FALLS, OR. DURING ROLLOUT THE ACFT NEARLY VEERED OFF THE SIDE OF THE RWY. THE PLT TOLD ATC HE NEEDED A REST STOP & HE HAD HAD A FLAP PROBLEM. WITNESSES REPORTED THE PLT LOOKED "NERVOUS, UNDECIDED & BEWILDERED." THE PLT CONTINUED HIS S-BND CIRCLING ROUTE OF FLT WHICH PLACED TEH ACFT OVER THE WESTERN SLOPES OF THE SIERRA NEVADA MTNS AT ELE OVER 7000 FT MSL. 40 MI WEST LAY THE CENTRAL VALLEY OF CA, ELE 300 FT MSL. WHILE CRUISING AT 13,000 FT THE PLT REVERSED COURSE & DISAPPEARED FM RADAR. THE ACFT CRASHED INVERTED INTO 4900 FT MSL TERRAIN, ABT 1.5 FM ITS LAST RADAR POSITION. WITNESSES REPORTED IT WAS RAINING HEAVILY & LIGHTNING WAS VISIBLE. THE PLT HAD NOT LOGGED ANY INST FLT TIME IN 19 YRS. HIS TOTAL TIME WAS 88 HRS. HIS TOTAL PIC TIME IN THE ACFT (WHICH HE HAD PURCHASED 3 WKS BEFORE THE ACCIDENT) WAS 0.5 HRS.
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: private
- Ratings: single-engine land
- Flight time: 88 hours in all; 8 in this make and model; 10 in the last 90 days; 8 in the last 30 days; 46 as pilot in command
- Medical certificate: Class 2 (valid medical--w/ waivers/lim.)
- Seat: unk
The aircraft
- Last inspection: inspection type not recorded, January 2, 2000
- Maximum gross weight: 2,740 lb
- Seats: 4
- Landing gear: retractable
- Engine: Lycoming IO-360-A1A (piston); 0 hours total
The flight
- Departed from: LMT Klamath Falls OR at 6:16 pm
- Destination: MOD Modesto CA
- Flight plan: VFR
- Runway 0
Weather at the time
- Light: daylight
- Sky: not recorded; not recorded
- Temperature: 0°F (-18°C), dew point 0°F (-18°C)
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 | |||
| Passengers | 3 |
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.
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 documents and photographs are the NTSB's docket, the folder of records gathered during the investigation, shown as the NTSB released them (the NTSB redacts some personal details first) and listed under the NTSB's own titles. This site's own text 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 LAX91FA190.