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NTSB AVIATION ACCIDENT/INCIDENT DATABASE REPORT


General Information

Data Source:                          NTSB AVIATION ACCIDENT/INCIDENT DATABASE
   Report Number:                        DEN88LA025 
   Local Date:                           11/19/1987
   Local Time:                           10:15 CST
   State:                                ND    
   City:                                 GRAND FORKS                        
   Airport Name:                                                  
   Airport Id:                                 
   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:                      SUBSTANTIAL      
   Phase of Flight:                      570 LANDING                                           
   Aircraft Make/Model:                  HUGHES HU-269-C                 
   Operator Doing Business As:                                         
   Operator Name:                        UNIVERSITY OF NORTH DAKOTA    
   Operator Code:                            
   Operator:                                                                       
   Owner Name:                           UNIVERSITY OF NORTH DAKOTA    

Narrative

THE CFI WAS INSTRUCTING THE PVT RATED DUAL STUDENT IN SIMULA TED FORCED 
   LANDINGS. DURING THE POWER RECOVERY FOLLOWING A PRACTICE AUTOROTATION, 
   THE ENGINE FAILED TO REGA IN RPM AT FULL THROTTLE. DURING THE FORCED 
   LANDING, THE HELICOPTER NOSED OVER AT TOUCHDOWN AND THE MAIN ROTOR 
   STRUCK THE TERRAIN. A POST ACCIDENT ENGINE RUN PRODUCED FULL RATED 
   POWER UNDER TEST CELL CONDITIONS. TH E ENGINE INSPECTION DID NOT REVEAL 
   EVIDENCE TO EXPLAIN THE REPORTED FAILURE OF THE ENGINE TO RESPOND.

Sequence of Events

Occurrence #: 1  200 HARD LANDING
   Phase of Operation: 553 DESCENT - UNCONTROLLED

           Findings
           Subject - Modifier - Personnel Cause/Factor

   1b.   24520(S) - 3100(M) - 4101(P)
         AUTOROTATION - ATTEMPTED - DUAL STUDENT
   2b.   22301(S) - 3115(M) - 4101(P)  Cause
         THROTTLE/POWER CONTROL - INADEQUATE - DUAL STUDENT
   3b.   22308(S) - 3127(M) - 4101(P)  Cause
         ADEQUATE ROTOR RPM - NOT MAINTAINED - DUAL STUDENT
   4b.   24558(S) - 3123(M) - 4103(P)  Cause
         ROTOR RPM - NOT CORRECTED - PILOT IN COMMAND (CFI)
   5b.   24627(S) - 3115(M) - 4103(P)  Cause
         SUPERVISION - INADEQUATE - PILOT IN COMMAND (CFI)

   Occurrence #: 2  380 ROLL OVER
   Phase of Operation: 571 LANDING - FLARE/TOUCHDOWN

           Findings
           Subject - Modifier - Personnel Cause/Factor


Probable Cause


Aircraft Information

Number of Seats:                      3  
   Aircraft Use:                         INSTRUCTIONAL      
   Type of Operation:                    14 CFR 91 
   Domestic/International:                            
   Passenger/Cargo:                                        
   Registration Number:                  11079 
   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:                         HIO-360-D1A  
   Number of Engines:                    1 
   Engine Type:                          RECIPROCATING-FUEL INJECTED 

Environment/Operations Information

Basic Weather Conditions:             VISUAL METEOROLOGICAL CONDITIONS (VMC)  
   Wind Direction (deg):                 310
   Wind Speed (knots):                   9
   Visibility (sm):                      20
   Visibility RVR (ft):                  0
   Visibility RVV (sm):                  0
   Cloud Height Above Ground Level (ft): 1800
   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:                        NONE
   VFR Approach/Landing:                 SIMULATED FORCED LANDING
   Event Location:                       OFF AIRPORT/AIRSTRIP

Pilot-in-Command

Certificates:                         COMMERCIAL, FLIGHT INSTRUCTOR
   Ratings:
     Plane:                              SINGLE ENGINE LAND
     Non-Plane:                          HELICOPTER
     Instrument:                         AIRPLANE
   Had Current BFR:                      YES
   Months Since Last BFR:                1  
   Medical Certificate:                  CLASS 2
   Medical Certificate Validity:         VALID MEDICAL-NO WAIVERS/LIMITATIONS

              Flight Time (Hours)
   Total       :    937  Last 24 Hrs :    1
   Make/Model  :     71  Last 30 Days:    0
   Instrument  :     67  Last 90 Days:   30
   Multi-Engine:      0  Rotorcraft  :  886

 

Source: NTSB