WPR10CA364 · Bell 206 B II
Bell 206 B II · Accident: loss of tail rotor effectiveness on approach
From Brackett Field (POC) to Big Bear City Airport (L35)
Event
- NTSB case
- WPR10CA364
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Bell 206 B II
- Aircraft type
- Bell 206
- Category
- Helicopter
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N788BD
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Brackett Field (POC), La Verne, CATo Big Bear City Airport (L35), Big Bear City, CA
- Aircraft age
- Not recorded
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Approach
- Defining eventThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Loss of tail rotor effectiveness
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Aircraft › Aircraft oper/perf/capability
- Personnel issues › Task performance
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The helicopter pilot was approaching the airport for landing about 350 feet above ground level when a fixed-wing airplane taxied in front of his intended landing spot and stopped. He slowed the helicopter to avoid blowing the airplane and the helicopter subsequently lost tail rotor effectiveness. The helicopter then rapidly descended to the ground and came to rest in a drainage depression. The helicopter sustained substantial damage to the fuselage and tail boom during the accident sequence and the pilot was not injured. The airport elevation was 6,572 feet mean sea level (msl) and the calculated density altitude at the time of the accident was about 9,300 feet msl. The pilot reported no mechanical malfunctions or failures with the helicopter and further stated that he could have prevented the accident by avoiding slow speeds at high density altitudes.
Probable cause
The pilot's failure to maintain directional control during the landing approach.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record WPR10CA364
- Event ID
- 20100724X45451
- Case number
- WPR10CA364
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: 0c18d890e03e278670795649633a0dc35ce0fe1f9eec8c562ab6d3f325896930; retrieved 2026-09-15T14:45:02.460Z.