Cessna 421B N11BU
3 July 1992 · Hayward, California, United States · No injuries
Summary
On 3 July 1992 at about 00:45 local time, a Cessna 421B registered N11BU, operated by Professional Pilot Associates, was involved in an accident near Hayward, California, United States. One person was on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.
The record
- Date
- at 00:45
- Classification
- Accident
- Location
- Hayward, California, United States
- Nearest airport
- Hayward (HWD)
- Coordinates
- 37.6698, -122.0793
- Aircraft
- Cessna 421B
- Registration
- N11BU
- Category
- Airplane
- Engines
- 2
- Operator
- Professional Pilot Associates
- Operating rule
- Part 91: General Aviation
- Purpose of flight
- Positioning
- Phase of flight
- Not recorded
- Route
- Unknown → Oakland
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- LAX92LA276
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 1 |
Probable cause
THE EXPLOSION OF FUEL VAPORS IN THE RIGHT WING DUE TO THE PILOT'S OVERPRIMING OF THE RIGHT ENGINE DURING A START ATTEMPT AND AN UNCORRECTED PREEXISTING FUEL SYSTEM LEAK. A FACTOR IN THE ACCIDENT WAS INADEQUATE MAINTENANCE PERFORMED ON THE AIRCRAFT.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
THE PILOT REPORTED THAT HE OVERPRIMED THE RIGHT ENGINE WHEN HE ATTEMPTED TO START IT. DURING THE START OPERATION, AN ACCUMULATION OF FUEL VAPOR LOCATED OUTBOARD OF THE RIGHT ENGINE EXPLODED AND RIPPED OPEN A YARD LONG PORTION OF THE RIGHT WING'S UPPER SKIN PANELS. EVIDENCE WAS OBSERVED OF AN UNCORRECTED PREEXISTING FUEL LEAK IN THE VICINITY OF THE RIGHT ENGINE'S AUXILIARY FUEL PUMP. THE PILOT REPORTED THAT HE WAS AN A & P MECHANIC, AND HE OWNED, OPERATED AND MAINTAINED THE AIRPLANE.
Quoted verbatim from the NTSB record.
Other Cessna 421 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 22 Nov 1992 | Cessna 421C | Santa Maria, California, United States | Farroll Equipment Compnany | Serious injuries | - |
| 5 Jan 1992 | Cessna 421C | Mammoth Lakes, California, United States | Frank Gearhart | Fatal | 4 |
| 5 Jul 1992 | Cessna 421B | Shelter Cove, California, United States | Dana L. Brenneman | Serious injuries | - |
| 24 Jun 1992 | Cessna 421B | Monterey, California, United States | Judith REA Enterprises | Fatal | 3 |
| 13 Jan 1992 | Cessna 421C | Atlantic Ocean | Williamson, J. M. | Fatal | 5 |
| 22 Jun 1992 | Cessna 421B | Columbus, Ohio, United States | Shoeware Limited | No injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 22 Feb 1992 | Piper PA-28R-201T | Ludlow, California, United States | Higgins, Melvin W & Jean | Minor injuries | - |
| 22 Feb 1992 | Beechcraft C-23 | Fullerton, California, United States | Eldon R. Howe | No injuries | - |
| 23 Feb 1992 | Cessna 150 | San Jose, California, United States | Veda Corporation | Minor injuries | - |
| 23 Feb 1992 | Cessna 182N | San Ardo, California, United States | Soil Service, Inc. | No injuries | - |
| 25 Feb 1992 | Grumman G-164B | Dixon, California, United States | Sunrise Duster, Inc. | No injuries | - |
| 25 Feb 1992 | Bellanca 7ECA | Apple Valley, California, United States | Chester Waite | Serious injuries | - |