# NTSB ANC78FA050: Bell 47D-1, N755E, Anchorage, AK, July 13, 1978 - Type: NTSB incident investigation - Classification: Incident · No injuries · Closed - Date: July 13, 1978 - Place: Anchorage, AK · ANCHORAGE, AK - Location: 61.2181° N, 149.9003° W: Placed by OpenAirDocs: center of Anchorage, AK, within about 23 miles (OpenAirDocs) - Nearby events: https://openairdocs.org/map.md?lat=61.2181&lon=-149.9003&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report August 8, 1979 - Report: Brief approved by the director - NTSB case key (mKey): 140434 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC78FA050 - Page: https://openairdocs.org/ntsb/ANC78FA050 ## NTSB brief ``` ----------------------------------------------------------------------------------------------------------------------------  FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA                                                                F  S M/N     PURPOSE ---------------------------------------------------------------------------------------------------------------------------- 3-4424  78/7/13    ANCHORAGE,AK        BELL 47D-1          CR-  0  0  2  INSTRUCTIONAL             PRIVATE, AGE 27, 120         TIME - 0900                    N755E               PX-  0  0  0  CHECK                     TOTAL HOURS, 27 IN TYPE,                                        DAMAGE-SUBSTANTIAL  OT-  0  0  0                            NOT INSTRUMENT RATED.         CLASSIFIED AS INCIDENT         DEPARTURE POINT             INTENDED DESTINATION           ANCHORAGE,AK                LOCAL         TYPE OF ACCIDENT                                         PHASE OF OPERATION            ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: CLIMB TO CRUISE            HARD LANDING                                             LANDING: POWER-OFF AUTOROTATIVE LANDING         PROBABLE CAUSE(S)            PERSONNEL - MAINTENANCE,SERVICING,INSPECTION: INADEQUATE MAINTENANCE AND INSPECTION            POWERPLANT - IGNITION SYSTEM: SPARK PLUG            MISCELLANEOUS ACTS,CONDITIONS - WRONG PART            PILOT IN COMMAND - IMPROPER OPERATION OF POWERPLANT & POWERPLANT CONTROLS            MISCELLANEOUS ACTS,CONDITIONS - ANTI-ICING/DEICING EQUIPMENT-IMPROPER OPERATION OF/OR FAILED TO USE            MISCELLANEOUS ACTS,CONDITIONS - ICE-CARBURETOR            PILOT IN COMMAND - MISJUDGED ALTITUDE AND CLEARANCE         FACTOR(S)            WEATHER - CONDITIONS CONDUCIVE TO CARB./INDUCTION SYSTEM ICING         PARTIAL POWER LOSS - PARTIAL LOSS OF POWER - 1 ENGINE         EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING OFF AIRPORT         SKY CONDITION                                            CEILING AT ACCIDENT SITE           OVERCAST                                                  2500         VISIBILITY AT ACCIDENT SITE                              PRECIPITATION AT ACCIDENT SITE           5 OR OVER(UNLIMITED)                                     RAIN         OBSTRUCTIONS TO VISION AT ACCIDENT SITE                  TYPE OF WEATHER CONDITIONS           UNKNOWN/NOT REPORTED                                     VFR         TYPE OF FLIGHT PLAN           VFR         REMARKS- MIXED SET OF SPARK PLUGS ALSO EXCESSIVE GAP ON PLUGS. ``` ## Aircraft - Registration: [N755E](https://openairdocs.org/aircraft/N755E), registered now, S/N 312, built 1951 (OpenAirDocs) - Reported make and model: BELL 47D-1 - Registry model: [Bell 47D1](https://openairdocs.org/model/bell-47d1) (registry code 1180802) (OpenAirDocs) - Registry engine: [Franklin 6V4 series](https://openairdocs.org/engine/franklin-6v4-series) (registry code 27033, reciprocating) (OpenAirDocs) - Category: Helicopter - Engines: reciprocating - Damage: Substantial damage ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Incident 19780713043869I](https://openairdocs.org/incident/19780713043869I), Jul 13, 1978: Bell 47D1, Anchorage, AK, Minor damage. Engine misfired and during precautionary landing tail rotor contacted ground. ## Other investigations on N755E (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB MIA98LA254](https://openairdocs.org/ntsb/MIA98LA254), Sep 29, 1998: Bell 47-D1 (N755E), Oxford, MS, substantial damage. Probable cause: The pilot's failure to maintain directional control due to vibration from the main rotor blade for undetermined reasons. A related finding was the improper repair of a crack in the laminant of the… From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.