Piper PA-23 accident near Maricopa, Arizona, June 1, 1991
On June 1, 1991 at about 1:40 am local time, a Piper PA-23, registered N1237P, was destroyed in an accident near Maricopa, Arizona. It was a personal flight under general aviation rules (Part 91). 2 people were killed. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
THE PILOT'S POOR JUDGEMENT IN THE OPERATION OF THE AIRPLANE WITH KNOWN DEFICIENCIES AND THE INADVERTENT STALL DURING A FORCED LANDING. THE PILOT/OWNERS LACK OF MAINTENANCE ON THE AIRPLANE AND THE PILOT'S IMPAIRMENT BY ALCOHOL WERE FACTORS IN THE ACCIDENT.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- June 1, 1991 · about 1:40 am local time
- Place
- Maricopa, Arizona
- Type
- Accident
- Injuries
- 2 people were killed.
- Weather
- visual conditions (good weather)
- Aircraft
- Piper PA-23 · all PA-23s on the register
- Registration
- N1237P · no longer on the register · serial 23-258
- Damage
- Destroyed
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
THE CERTIFICATED PRIVATE PILOT AND A PASSENGER DEPARTED IN A TWIN ENGINE AIRPLANE ON A LOCAL FLIGHT AND WERE REPORTED OVERDUE. WITNESSES INDICATED THAT THE LEFT ENGINE WAS NOT PRODUCING FULL POWER. THE AIRPLANE WAS LOCATED THE FOLLOWING DAY ABOUT 22 MILES FROM THE DEPARTURE AIRPORT. BOTH OCCUPANTS WERE FATALLY INJURED. THE INVESTIGATION REVEALED THAT THE AIRPLANE WAS UNAIRWORTHY. THE LEFT ENGINE PRIMER WAS NOT LOCKED AND AUTOMOTIVE GASOLINE WAS UTILIZED IN THE AIRPLANE. THE PILOT INTENTIONALLY SECURED THE ENGINES AND FEATHERED THE PROPELLERS. THE AIRPLANE STRUCK THE GROUND WITH LITTLE FORWARD SPEED, AT A HIGH VERTICAL DESCENT RATE, IN A NOSE DOWN AND NEAR WINGS LEVEL ATTITUDE. THE PILOT DID NOT POSSESS A CURRENT MEDICAL CERTIFICATE OR A MULTIENGINE RATING. THE PILOT'S RECENCY OF EXPERIENCE COULD NOT BE DETERMINED. TOXICOLOGICAL TESTING REVEALED THAT THE PILOT AND PASSENGER HAD ALCOHOL PRESENT IN THEIR BLOOD.
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
- Medical certificate: None
- Seat: left
The aircraft
- Airframe total time: 4,526 hours
- Last inspection: annual inspection, October 7, 1989; 3 hours since
- Maximum gross weight: 3,500 lb
- Seats: 4
- Landing gear: retractable
- Engine: Lycoming O-320-A1A (piston); 0 hours total
The flight
- Departed from: GEU Glendale AZ at 1:15 am
- Flight plan: none
- Runway 0
Weather at the time
- Light: daylight
- Wind: from 210° at 20 knots, gusting 25
- Visibility: 20 statute miles
- Sky: scat at 6,000 ft
- Temperature: 81°F (27°C), dew point 0°F (-18°C)
- Altimeter: 29.00 inHg
- Observation at 10:45 pm from GEU, 22 miles away
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 | |||
| Passengers | 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.
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.