- Date
- July 14, 1966
- Place
- Clinton, MT · CLINTON, MT
- Injuries
- 3 serious
- Damage
- Destroyed
- Phase of flight
- Takeoff
- Aircraft
- N8509FBell 47-G3B
- Status
- Completed · report March 1, 1967
- Report
- Brief approved by the director
- Case key
- 171661
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 ---------------------------------------------------------------------------------------------------------------------------- 2-0559 66/7/14 CLINTON MONT BELL 47-G3B CR- 0 1 0 NONCOMMERCIAL COMMERCIAL, FL.INSTR., TIME - 0915 N8509F PX- 0 2 0 AERIAL SURVEY AGE 47, 1766 TOTAL HOURS, DAMAGE-DESTROYED OT- 0 0 0 266 IN TYPE, NOT INSTRUMENT RATED. TYPE OF ACCIDENT PHASE OF OPERATION ENGINE FAILURE OR MALFUNCTION TAKEOFF: VERTICAL HARD LANDING IN FLIGHT: UNCONTROLLED DESCENT PROBABLE CAUSE(S) POWERPLANT - EXHAUST SYSTEM: EXTERNAL SUPERCHARGER MISCELLANEOUS ACTS,CONDITIONS - WARPED POWERPLANT - EXHAUST SYSTEM: GASKET MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE POWERPLANT - EXHAUST SYSTEM: CLAMPS MISCELLANEOUS ACTS,CONDITIONS - LOOSE,PART/FITTING PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE FIRE AFTER IMPACT REMARKS- MINING EXPLORATION FLIGHT.DENSITY ALT.8850 FT.EXHAUST GAS LEAKAGE CAUSED REDUCED TURBOCHGER EFFNCY
Aircraft
- Registration
- N8509F
- Reported as
- Bell 47-G3B
- Category
- Helicopter
- Engine
- reciprocating
- Damage
- Destroyed
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.