NTSB Identification: DEN72AD025
14 CFR Part 121 Scheduled operation of FRONTIER AIRLINES INC
Aircraft: BEECH 99A, registration: N21FW

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 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
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1-0026  71/11/24 NR.GREELEY,COLO       BEECH 99A           CR-  0  0  2  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 1912                    N21FW               PX-  0  0  6                            41, 16236 TOTAL HOURS,
                                       DAMAGE-SUBSTANTIAL  OT-  0  0  0                            125 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        OPERATOR - FRONTIER AIRLINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          CHEYENNE,WYO                DENVER,COLO
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           PROPELLER/ROTOR FAILURE: PROPELLER                       IN FLIGHT: DESCENDING
           ENGINE TEARAWAY                                          IN FLIGHT: DESCENDING
        PROBABLE CAUSE(S)
           POWERPLANT - PROPELLER AND ACCESSORIES: BLADES
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
           MISCELLANEOUS ACTS,CONDITIONS - OVERLOAD FAILURE
           PERSONNEL - PRODUCTION-DESIGN-PERSONNEL: OTHER
        FACTOR(S)
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
           MISCELLANEOUS ACTS,CONDITIONS - VIBRATION,EXCESSIVE
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  SUSPECTED OR KNOWN AIRCRAFT DAMAGE
        REMARKS- R PROP BLADE FAILED DUE FATIGUE INDUCED BY IMPROPER MACHINING IN BALANCE HOLE CAVITY,DMGD FUSELAGE

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