Probable cause
A partial loss of engine power during climbout due to a malfunctioning magneto and spark plugs.
NTSB analysis
The pilot reported that, during climbout, the engine experienced a partial loss of power, the helicopter shook violently, and the engine then made a couple of "popping" sounds. He immediately initiated a precautionary landing to an open field. During the landing, the right skid caught on the ground, and the helicopter then rolled onto its right side.
During postaccident functional tests, the left magneto and the No. 5 cylinder's spark plugs did not function properly. No further evidence of mechanical malfunctions or failures that would have precluded normal operation were observed. Therefore, it is likely that the malfunctioning left magneto and spark plugs caused the partial loss of engine power.
Text from the NTSB. Open the NTSB docket for WPR14LA180 for the full record.
Event
- Date
- May 3, 2014
- Type
- Accident
- Place
- El Monte, California
- Nearest airport
- El Monte (EMT)
- Highest injury
- Minor
- Minor injuries
- 2
- Weather
- Visual (VMC)
- Light
- Day
Bell 47G
- N-number
- N7895B
- Category
- Helicopter
- Year built
- 1958
- Damage
- Substantial
- Operating rule
- Part 91 (general aviation)
- Purpose of flight
- Personal
From the NTSB aviation accident database: N-registered aircraft, events since 2008, data through Oct 28, 2026. The file is published monthly, so the latest weeks are incomplete and recent records can change. The official source is the NTSB aviation investigation search. CheckAero is independent and not affiliated with the NTSB.