NTSB Identification: DEN80FA060
14 CFR Part 91 General Aviation
Aircraft: BELL UH-1B, registration: N99478
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
3-3697   80/9/2  NR.PROVO,UT           BELL UH-1B          CR-  0  0  1  COMMERCIAL                COMMERCIAL, AGE 32, 6150
        TIME - 0930                    N99478              PX-  1  3  0  CONSTRUCTION              TOTAL HOURS, 1300 IN
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            TYPE, INSTRUMENT RATED.
        DEPARTURE POINT             INTENDED DESTINATION
          BASE CAMP                   LANDING ZONE
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            TAKEOFF: VERTICAL
           HARD LANDING                                             TAKEOFF: ABORTED
        PROBABLE CAUSE(S)
           PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: IMPROPERLY SERVICED AIRCRAFT (GROUND CREW)
           ROTORCRAFT - TRANSMISSION ROTOR DRIVE SYSTEM: TAIL ROTOR GEAR BOX
           MISCELLANEOUS ACTS,CONDITIONS - LACK OF LUBRICATION-SPECIFIC PART,NOT SYSTEM
        EMERGENCY CIRCUMSTANCES - FORCED LANDING OFF AIRPORT ON LAND
Full narrative is not available


​​​​​​