Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
San Jose, California 95122
Tuesady, August 13, 1991 18:15 PDT
NTSB Narrative Summary Released at Completion of Accident
THE ENGINE WAS OVERHAULED AND MODIFIED ABOUT SIX OPERATING HOURS PRIOR TO THE ACCIDENT WITH A NEW TYPE OF CAM SHAFT UNDER THE PROVISIONS OF A SUPPLEMENTAL TYPE CERTIFICATE. THE PILOT SAID HE WAS IN LEVEL CRUISE WHEN HE HEARD A LOUD BANG EMANATE FROM THE ENGINE CONCURRENTLY WITH IT STOPPING. AN INITIAL INSPECTION OF THE AIRCRAFT ON SITE BY FAA INSPECTORS REVEALED THAT OIL COVERED THE WIND SHIELD. THE NUMBER TWO CYLINDER ROD WAS OBSERVED TO BE PROTRUDING FROM A HOLE IN THE TOP OF THE ENGINE CASE. ONE COUNTER WEIGHT ASSEMBLY WAS FOUND MISSING FROM THE CRANKSHAFT COUNTERWEIGHT BLADE. THE MISSING COUNTERWEIGHT, COVER PLATES, RETAINING CIR-CLIPS, AND ASSOCIATED BUSHINGS WERE FOUND IN THE OIL PAN. OPTICAL EXAMINATION OF THE RECOVERED PIECES REVEALED THAT THE RETAINING CIR-CLIP FAILED, ALLOWING THE COUNTER WEIGHT PIN AND THE WEIGHT ITSELF TO SEPARATE FROM THE CRANKSHAFT. THE INSPECTOR DETERMINED THAT THE CIR-CLIP HAD BEEN INSTALLED BACKWARDS.
NTSB Probable Cause Narrative
THE FAILURE OF THE CRANKSHAFT COUNTERWEIGHT RETAINING CLIP DUE TO IMPROPER MAINTENANCE INSTALLATION OF THE PART.
Event Information
| Type of Event | Accident |
| Event Date | 8/13/1991 |
| Event Day of the Week | Tuesday |
| Time of Event | 1815 |
| Event Time Zone | Pacific Daylight Time |
| Event City | SAN JOSE |
| Event State | CALIFORNIA |
| Event Country | -- |
| Zipcode of the event site | 95122 |
| Event Date Year | 1991 |
| Event Date Month | 8 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | |
| Event Location Longitude | |
| Event Location Airport | |
| Event Location Nearest Airport ID | |
| Indicates whether the acc/inc occurred off or on an airport | Off Airport/Airstrip |
| Distance from airport in statute miles | 0 |
| Degrees magnetic from airport | 0 |
| Airport Elevation | -- |
| Weather Briefing Completeness | Unknown |
| Investigator's weather source | Pilot |
| Time of the weather observation | 0 |
| Direction of event from weather observation facility (degrees) | 0 |
| Weather Observation Facility ID | |
| Elevation of weather observation facility | 0 |
| Distance of event from weather observation facility (units?) | 0 |
| Time Zone of the weather observation | |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 0 |
| Lowest Non-Ceiling Height | 10000 |
| Sky/Lowest/Cloud Conditions | Scattered |
| Sky Condition for Lowest Ceiling | None |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 25 |
| Air Temperature at event time (in degrees celsius) | 32 |
| Dew Point at event time (in degress fahrenheit) | 20 |
| Wind Direction (degrees magnetic) | 300 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 12 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Unknown |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | -- |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | Unknown |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 1 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 1639 |
| NTSB Notification Source | -- |
| NTSB Notification Date | -- |
| NTSB Notification Time | 0 |
| Fiche Number and/or location -used to find docket information | 45299 |
| Date of most recent change to record | Dec 12 2000 10:39AM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N3028C |
| NTSB Number | LAX91LA358 |
| Missing Aircraft Indicator | N |
| Federal Aviation Reg. Part | Part 91: General Aviation |
| Type of Flight Plan filed | None |
| Flight plan Was Activated? | -- |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | BEECH |
| Aircraft Model | J35 |
| Aircraft Series Identifier | J35 |
| Aircraft Serial Number | D-5693 |
| Certified Max Gross Weight | 2900 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | U.S. Registered/U.S. Soil |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 4 |
| Number of Engines | 1 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Annual |
| Date of Last Inspection | Feb 13 1991 12:00AM |
| Airframe hours since last inspection | 26 |
| Airframe Hours | 3685 |
| ELT Installed | Yes |
| ELT Activated | Yes |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | DTB AVIATION |
| Aircraft Owner Street Address | 17436 PLEASANT VIEW AVENUE |
| Aircraft Owner City | LOS GATOS |
| Aircraft Owner State | CA |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 95030 |
| Operator is an individual? | -- |
| Operator Name | DTB AVIATION |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | Yes |
| Operator Street Address | 17436 PLEASANT VIEW AVENUE |
| Operator City | LOS GATOS |
| Operator State | CA |
| Operator Country | |
| Operator Zip code | 95030 |
| Operator Code | |
| Owner has at least one certificate | None |
| Other Operator of large aircraft? | No |
| Certified for Part 133 or 137 Operation | Unknown |
| Operator Certificate Number | -- |
| Indicates whether an air carrier operation was scheduled or not | -- |
| Indicates Domestic or International Flight | -- |
| Operator carrying Pax/Cargo/Mail | -- |
| Type of Flying (Per_Bus / Primary) | Personal |
| Second Pilot on Board | No |
| Departure Point Same as Event | Yes |
| Departure Airport Code | |
| Departure City | |
| Departure State | |
| Departure Country | |
| Departure Time | 1615 |
| Departure Time Zone | PDT |
| Destination Same as Local Flt | -- |
| Destination Airport Code | 307 |
| Destination City | HOLLISTER |
| Destination State | CA |
| Destination Country | |
| Specific Phase of Flight | Cruise |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jan 2 2001 10:35AM |
| User who most recently changed record | dbo |
| Since inspection or accident | -- |
| Event Location Runway Number and Location | 0 |
| Runway Length | -- |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |