Amateur-built FALCON XP accident near Mesa, Arizona, July 20, 1996
On July 20, 1996 at about 4:20 pm local time, a amateur-built FALCON XP, registered N647AA, was substantially damaged in an accident near Mesa, Arizona (Falcon Field). It was a personal flight under general aviation rules (Part 91). 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
blockage of the fuel system vent in the fuel cap, when the pilot overtorqued the fuel cap during his preflight check, which restricted fuel flow to the engine. The pilot's lack of experience in the make and model of airplane was a related factor.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- July 20, 1996 · about 4:20 pm local time
- Place
- Mesa, Arizona · Falcon Field · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Amateur-built FALCON XP
- Registration
- N647AA · registry record · serial 600137
- Damage
- Substantial damage
- Flight
- Personal flight · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
After takeoff, the pilot remained in the traffic pattern and initiated a go-around after the first landing. During the initial climb, the engine decelerated to idle, then lost all power. The pilot attempted to return to the airport, but was unable. The airplane was damaged during a forced landing in an orange grove. During an examination after the accident, no mechanical failure or malfunction was found with the engine or any of the engine components. The airplane's fuel system tank vent in the fuel cap was found closed. The design of the cap consisted of a rubber stopper that was squeezed by a threaded wing bolt. A small hole in the stopper served as a vent. When squeezing pressure was applied to the rubber stopper by turning the wing nut, the wall would expand, decreasing the size of the fuel system vent. Excessive tightening of the wing nut would squeeze the vent closed. The pilot had only about 4 hours of flight time in this make/model of airplane.
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: 82 hours in all; 4 in this make and model; 16 in the last 90 days; 3 in the last 30 days; 82 as pilot in command
- Medical certificate: Class 3 (valid medical--w/ waivers/lim.)
- Seat: frt
The aircraft
- Last inspection: inspection type not recorded, May 26, 1996; 4 hours since
- Maximum gross weight: 1,050 lb
- Seats: 2
- Landing gear: fixed
- Engine: Rotax 503 (piston); 0 hours total
The flight
- Departed from: FFZ at 4:15 pm
- Flight plan: none
- Runway 0
Weather at the time
- Light: daylight
- Visibility: 20 statute miles
- Sky: broken clouds at 25,000 ft; clear
- Temperature: 99°F (37°C), dew point 50°F (10°C)
- Altimeter: 29.00 inHg
- Observation at 4:22 pm from FFZ, 1 miles away
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.
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.