- Date
- April 12, 1966
- Place
- Grand Canyon, AZ · GRAND CANYON, AZ
- Injuries
- 1 fatal, 2 serious
- Damage
- Destroyed
- Phase of flight
- Initial climb
- Aircraft
- N73909Bell 47G-3B
- Status
- Completed · report February 15, 1967
- Report
- Brief approved by the director
- Case key
- 172490
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
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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 ---------------------------------------------------------------------------------------------------------------------------- 2-0602 66/4/12 UNKNOWN/NOT REPORTEDBELL 47G-3B CR- 1 0 0 NONCOMMERCIAL COMMERCIAL, AGE 47, 6916 TIME - 0730 N73909 PX- 0 2 0 CORP/EXEC TOTAL HOURS, 1381 IN DAMAGE-DESTROYED OT- 0 0 0 TYPE, INSTRUMENT RATED. TYPE OF ACCIDENT PHASE OF OPERATION PROPELLER/ROTOR FAILURE: TAIL ROTOR TAKEOFF: INITIAL CLIMB COLLISION WITH GROUND/WATER: UNCONTROLLED IN FLIGHT: UNCONTROLLED DESCENT PROBABLE CAUSE(S) ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: TAIL ROTOR GEAR BOX MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE MISCELLANEOUS ACTS,CONDITIONS - JAMMED MISCELLANEOUS ACTS,CONDITIONS - IMPROPERLY INSTALLED PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND DIRECTIONAL CONTROL PROBLEM SUSPECTED OR KNOWN AIRCRAFT DAMAGE FIRE AFTER IMPACT REMARKS- ROLLER BEARING RETAINER RING MISSING.SPACER AND WASHER REVERSD ON PINION SHAFT.GEAR BOX 103 HR SOH
Aircraft
- Registration
- N73909
- Reported as
- Bell 47G-3B
- 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.
Other investigations on N73909 · 6
Matched to the same aircraft by N-number and date.
NTSB SEA04LA114Accident · Serious injuriesLimited investigationFinal reportMedford, ORThe pilot's failure to maintain clearance from a tree while maneuvering. Trees were a factor.NTSB SEA94LA065Accident · Serious injuriesLimited investigationFinal reportGold Hill, ORSeparation of the crossover fuel line, and the inability of the pilot in command to maintain a proper rate of descent during the autorotation.NTSB SEA74DYA12Accident · Serious injuriesClosedNew Meadows, IDNTSB LAX70A0008Accident · 3 fatalClosedGrnd Canyon, AZNTSB LAX69D0357Accident · No injuriesClosedGrnd Canyon, AZNTSB UNK64X0473Accident · 1 fatalClosedLittle Nway, CA