- Date
- July 2, 1975
- Place
- Napa, CA · NAPA, CA
- Injuries
- 1 fatal
- Damage
- Destroyed
- Phase of flight
- Takeoff
- Aircraft
- N988BBell 47G-2
- Status
- Completed · report August 29, 1975
- Report
- Brief approved by the director
- FAA report
- 19750702020319A
- Case key
- 149851
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
NTSB brief
NTSB’s brief of the accident, as it was printed: the coded facts, with the probable cause and factors.
---------------------------------------------------------------------------------------------------------------------------- FILE DATE LOCATION AIRCRAFT DATA INJURIES FLIGHT PILOT DATA F S M/N PURPOSE ---------------------------------------------------------------------------------------------------------------------------- 3-2066 75/7/2 NAPA,CA BELL 47G-2 CR- 1 0 0 COMMERCIAL COMMERCIAL, AGE 33, 6000 TIME - 1700 N988B PX- 0 0 0 ASSOC CROP CTL ACTIVITY TOTAL HOURS, 100 IN TYPE, DAMAGE-DESTROYED OT- 0 0 0 INSTRUMENT RATED. NAME OF AIRPORT - NAPA ARPT DEPARTURE POINT INTENDED DESTINATION NAPA,CA LOCAL TYPE OF ACCIDENT PHASE OF OPERATION PROPELLER/ROTOR FAILURE: TAIL ROTOR TAKEOFF: VERTICAL COLLISION WITH GROUND/WATER: UNCONTROLLED IN FLIGHT: UNCONTROLLED DESCENT PROBABLE CAUSE(S) ROTORCRAFT - ROTOR ASSEMBLIES: TAIL ROTOR BLADES MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: SUBSTANDARD QUALITY CONTROL FACTOR(S) MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT SPECIAL DATA TOTAL HOURS IN CROP CONTROL - 105 KIND OF OPERATION - DUSTING CROPS KIND OF CROP - GRAPES TYPE OF CHEMICAL USED - DRY CHEMICAL-NONTOXIC PILOT' S SEAT BELT -FASTENED-PROPERLY GLOVES - USED GOGGLES - NOT USED CRASH HELMET - AVAILABLE USED COCKPIT CRASHPAD - NOT INSTALLED CRASH BAR - NOT INSTALLED TANK/HOPPER-LOCATION - SIDES TERRAIN-TYPE -LEVEL,FLAT ELEVATION-AREA BEING TREATED-FEET - 50 FIRE AFTER IMPACT REMARKS- IMPROPERLY MACHINED T/R HUB BOLT FAILED. BLADE SEPARATED FROM ROTOR YOKE. PN 47-641-052-3.
Aircraft
- Registration
- N988B
- Reported as
- Bell 47G-2
- Category
- Helicopter
- Engine
- reciprocating
- Damage
- Destroyed
- Airport
- Napa Arpt
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.
Other investigations on N988B · 1
Matched to the same aircraft by N-number and date.