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NTSB AVIATION ACCIDENT/INCIDENT DATABASE REPORT


General Information

Data Source:                          NTSB AVIATION ACCIDENT/INCIDENT DATABASE
   Report Number:                        DEN85LA168 
   Local Date:                           06/18/1985
   Local Time:                           15:45 CDT
   State:                                ND    
   City:                                 GRAND FORKS                        
   Airport Name:                         GRAND FORKS INTL         
   Airport Id:                           GFK   
   Event Type:                           ACCIDENT
   Injury Severity:                      NONE   
   Report Status:                        FINAL      
   Mid Air Collision:                    NO 

Operations Information

Category of Operation:                GENERAL AVIATION       
   Aircraft Type:                        HELICOPTER     
   Aircraft Damage:                      DESTROYED        
   Phase of Flight:                      570 LANDING                                           
   Aircraft Make/Model:                  HUGHES HU-269-C                 
   Operator Doing Business As:                                         
   Operator Name:                                                      
   Operator Code:                            
   Operator:                                                                       
   Owner Name:                           UNIVERSITY OF NORTH DAKOTA    

Narrative

ON JUNE 18, 1985, A STUDENT PLT AND HIS INSTRUCTOR WERE ON A LOCAL TNG 
   FLT. PRIOR TO COMPLETING THE MISSION, THE INSTRUCTOR HAD HIS STUDENT 
   EXECUTE A 180 DEGREE AUTOROTATION . DURING THE MANEUVER, THE MAIN ROTOR 
   RPM WAS ALLOWED TO DECAY INTO THE CRITICAL RANGE WHICH RESULTED IN A 
   HARD LANDING AND SUBSEQUENTLY DESTROYED THE HELICOPTER.

Sequence of Events

Occurrence #: 1  200 HARD LANDING
   Phase of Operation: 571 LANDING - FLARE/TOUCHDOWN

           Findings
           Subject - Modifier - Personnel Cause/Factor

   1b.   24558(S) - 3127(M) - 4101(P)  Cause
         ROTOR RPM - NOT MAINTAINED - DUAL STUDENT
   2b.   24627(S) - 3115(M) - 4103(P)  Cause
         SUPERVISION - INADEQUATE - PILOT IN COMMAND (CFI)
   3b.   24520(S) - 3100(M) - 4101(P)  Cause
         AUTOROTATION - ATTEMPTED - DUAL STUDENT

Probable Cause


Aircraft Information

Number of Seats:                      3  
   Aircraft Use:                         INSTRUCTIONAL      
   Type of Operation:                    14 CFR 91 
   Domestic/International:                            
   Passenger/Cargo:                                        
   Registration Number:                  5203V 
   Air Carrier Operating Certificates:   
   Aircraft Fire:                        NONE

                  Injuries
          Fatal  Serious  Minor  None
   Crew      0       0       0      2
   Pass      0       0       0      0
   Other     0       0       0      0
   Invlvd    0       0       0      2

   Landing Gear:                         SKID
   Certificated Maximum Gross Weight:    1670
   Engine Make:                          LYCOMING     
   Engine Model:                         IO-360-D1A   
   Number of Engines:                    1 
   Engine Type:                          RECIPROCATING-FUEL INJECTED 

Environment/Operations Information

Basic Weather Conditions:             VISUAL METEOROLOGICAL CONDITIONS (VMC)  
   Wind Direction (deg):                 330
   Wind Speed (knots):                   20
   Visibility (sm):                      20
   Visibility RVR (ft):                  0
   Visibility RVV (sm):                  0
   Cloud Height Above Ground Level (ft): 0
   Visibility Restrictions:              NONE
   Precipitation Type:                   NONE
   Light Condition:                      DAYLIGHT
   Departure Airport Id:                     
   Departure City:                       
   Departure State:                        
   Destination Airport Id:                   
   Destination City:                     
   Destination State:                      
   Flight Plan Filed:                    NONE
   ATC Clearance:                        TRAFFIC ADVISORY
   VFR Approach/Landing:                 SIMULATED FORCED LANDING
   Event Location:                       ON AIRPORT

Pilot-in-Command

Certificates:                         COMMERCIAL, FLIGHT INSTRUCTOR
   Ratings:
     Plane:                              SINGLE ENGINE LAND
     Non-Plane:                          HELICOPTER
     Instrument:                         AIRPLANE, HELICOPTER
   Had Current BFR:                      YES
   Months Since Last BFR:                9  
   Medical Certificate:                  CLASS 2
   Medical Certificate Validity:         VALID MEDICAL-NO WAIVERS/LIMITATIONS

              Flight Time (Hours)
   Total       :   1661  Last 24 Hrs :    2
   Make/Model  :    224  Last 30 Days:    0
   Instrument  :    107  Last 90 Days:   40
   Multi-Engine:     20  Rotorcraft  : 1550

 

 

Source: NTSB