- Date
- August 13, 1968
- Place
- Twin Falls, ID · TWIN FALLS, ID
- Injuries
- 2 uninjured
- Damage
- Substantial damage
- Phase of flight
- Emergency descent
- Aircraft
- N8491EBell 47G-3B
- Status
- Completed · report March 18, 1969
- Report
- Brief approved by the director
- Case key
- 108700
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 ---------------------------------------------------------------------------------------------------------------------------- 3-4673 68/8/13 NR.TWIN FALLS,ID BELL 47G-3B CR- 0 0 2 INSTRUCTIONAL COMMERCIAL, AGE 24, 238 TIME - 0922 N8491E PX- 0 0 0 CHECK TOTAL HOURS, 54 IN TYPE, DAMAGE-SUBSTANTIAL OT- 0 0 0 NOT INSTRUMENT RATED. TYPE OF ACCIDENT PHASE OF OPERATION ENGINE FAILURE OR MALFUNCTION IN FLIGHT: AUTOROTATIVE DESCENT HARD LANDING LANDING: POWER-OFF AUTOROTATIVE LANDING PROBABLE CAUSE(S) MISCELLANEOUS ACTS,CONDITIONS - SIMULATED CONDITIONS MISCELLANEOUS ACTS,CONDITIONS - ENGINE LOADED UP CHECK PILOT - IMPROPER OPERATION OF POWERPLANT & POWERPLANT CONTROLS CHECK PILOT - FAILED TO FOLLOW APPROVED PROCEDURES,DIRECTIVES,ETC. CHECK PILOT - IMPROPER OPERATION OF FLIGHT CONTROLS FACTOR(S) PILOT IN COMMAND - CONTROL INTERFERENCE COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND REMARKS- ABRUPT THROTTLE REDUCTION WHEN FLT MANUAL STATES RETARD THROTTE SLOWLY,MAINT 2000 RPM.
Aircraft
- Registration
- N8491E
- Reported as
- Bell 47G-3B
- Category
- Helicopter
- Engine
- reciprocating
- Damage
- Substantial damage
N8491ERegistration cancelled Jan 26, 2018 · Bell 47G-3BAirframe modelBell 47G-3BEngine modelLycoming TVO-435-GIA
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.
Other investigations on N8491E · 2
Matched to the same aircraft by N-number and date.
NTSB SEA97LA112Accident · Minor injuriesLimited investigationFinal reportSnohomish, WAthe pilot's encounter with of a loss of tail rotor effectiveness (LTE) situation, and his subsequent inadequate remedial action. Related factors included: wind conditions that were conducive to an unanticipated right yaw event, and the pilot's limited…NTSB UNK64X2017Accident · Minor injuriesClosedMuldoon, ID