Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
Pueblo, Colorado 81001
Saturday, June 23, 2012 8:30 MDT
NTSB Narrative Summary Released at Completion of Accident
The pilot reported that there was an electrical system failure during the cruise portion of the test flight, which resulted in insufficient voltage to maintain engine operation using either the primary or secondary battery circuits. Following the total loss of engine power, the pilot elected to perform a wheels-up landing on a gravel road. The non-certificated automobile engine that was installed in the airplane was equipped with a computer-controlled electronic ignition system and high-pressure fuel pumps. According to the pilot/builder, the airplane incorporated two 12-volt batteries wired in parallel to supply voltage to the main power bus to power the engine systems. Postaccident examination revealed that the primary battery had an internal short and would not take a charge. The secondary battery was found below normal service voltage, but could be recharged. Postaccident testing revealed that the two batteries were not isolated from each other; as a result, an internal short of one of the two batteries could drain the other battery’s charge. No anomalies were found with the remaining electrical system components or wiring paths.
NTSB Probable Cause Narrative
An internal failure of one of the electrical system’s two batteries combined with the inadequate electrical system design, which resulted in a total loss of engine power.
Event Information
| Type of Event | Accident |
| Event Date | 6/23/2012 |
| Event Day of the Week | Saturday |
| Time of Event | 830 |
| Event Time Zone | Mountain Daylight Time |
| Event City | Pueblo |
| Event State | COLORADO |
| Event Country | -- |
| Zipcode of the event site | 81001 |
| Event Date Year | 2012 |
| Event Date Month | 6 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | 381721N |
| Event Location Longitude | 1042947W |
| 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 | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | -- |
| Weather Briefing Completeness | -- |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 853 Mountain Daylight Time |
| Direction of event from weather observation facility (degrees) | 360 |
| Weather Observation Facility ID | KPUB |
| Elevation of weather observation facility | 4729 |
| Distance of event from weather observation facility (units?) | 8 |
| Time Zone of the weather observation | MDT |
| Lighting Conditions | Day |
| Lowest Ceiling Height | -- |
| Lowest Non-Ceiling Height | -- |
| Sky/Lowest/Cloud Conditions | Clear |
| Sky Condition for Lowest Ceiling | None |
| Visibility Runway Visual Range (Feet) | -- |
| Visibility Runway Visual Value (Statute Miles) | -- |
| Visibility (Statute Miles) | 10 |
| Air Temperature at event time (in degrees celsius) | 29 |
| Dew Point at event time (in degress fahrenheit) | -2 |
| Wind Direction (degrees magnetic) | 220 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 3 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | -- |
| Altimeter Setting at event time (in. Hg) | 29.91 |
| Density Altitude (feet) | -- |
| Intensity of Precipitation | -- |
| METAR weather report | METAR KPUB 231453Z 22003KT 10SM CLR 29/M02 A2991 R |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | -- |
| On Ground, Minor Injuries | -- |
| On Ground, Serious Injuries | -- |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 1 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 30087 |
| NTSB Notification Source | FAA - Northwest Mountain Regio |
| NTSB Notification Date | -- |
| NTSB Notification Time | -- |
| Fiche Number and/or location -used to find docket information | -- |
| Date of most recent change to record | Jul 6 2012 2:05PM |
| User who most recently changed record | bowl |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N2051P |
| NTSB Number | CEN12LA389 |
| Missing Aircraft Indicator | -- |
| Federal Aviation Reg. Part | Part 91: General Aviation |
| Type of Flight Plan filed | None |
| Flight plan Was Activated? | No |
| Damage | Substantial |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | Hoyle |
| Aircraft Model | Fighter Escort Wings |
| Aircraft Series Identifier | -- |
| Aircraft Serial Number | T-035 |
| Certified Max Gross Weight | 2645 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | -- |
| Aircraft is a homebuilt? | Yes |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 1 |
| Number of Engines | 1 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Conditional |
| Date of Last Inspection | May 30 2012 12:00AM |
| Airframe hours since last inspection | -- |
| Airframe Hours | 12 |
| ELT Installed | No |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | Clifford L. Hoyle |
| Aircraft Owner Street Address | -- |
| Aircraft Owner City | Pueblo |
| Aircraft Owner State | CO |
| Aircraft Owner Country | USA |
| Aircraft Owner Zipcode | 81001-1769 |
| Operator is an individual? | No |
| Operator Name | Clifford L. Hoyle |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | Yes |
| Operator Street Address | -- |
| Operator City | Pueblo |
| Operator State | CO |
| Operator Country | USA |
| Operator Zip code | 81001-1769 |
| Operator Code | -- |
| Owner has at least one certificate | None |
| Other Operator of large aircraft? | No |
| Certified for Part 133 or 137 Operation | -- |
| 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) | Flight Test |
| Second Pilot on Board | No |
| Departure Point Same as Event | No |
| Departure Airport Code | KPUB |
| Departure City | Pueblo |
| Departure State | CO |
| Departure Country | USA |
| Departure Time | 810 |
| Departure Time Zone | MDT |
| Destination Same as Local Flt | dest & departure same, accident can occur anywhere |
| Destination Airport Code | KPUB |
| Destination City | Pueblo |
| Destination State | CO |
| Destination Country | USA |
| Specific Phase of Flight | -- |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Jul 5 2012 3:11PM |
| User who most recently changed record | foxt |
| Since inspection or accident | Time of Accident |
| Event Location Runway Number and Location | N/A |
| Runway Length | -- |
| Runway Width | -- |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |