General Information

Data Source:                          NTSB AVIATION ACCIDENT/INCIDENT DATABASE
   Report Number:                        CHI91LA134B
   Local Date:                           04/16/1991
   Local Time:                           18:15 CDT
   State:                                ND    
   City:                                 GRAND FORKS                        
   Airport Name:                                                  
   Airport Id:                                 
   Event Type:                           ACCIDENT
   Injury Severity:                      NONE   
   Report Status:                        FINAL      
   Mid Air Collision:                    YES

Operations Information

Category of Operation:                GENERAL AVIATION       
   Aircraft Type:                        AIRPLANE       
   Aircraft Damage:                      MINOR            
   Phase of Flight:                      560 APPROACH                                          
   Aircraft Make/Model:                  PIPER PA-28-161                 
   Operator Doing Business As:                                         
   Operator Name:                        UNIVERSITY OF NORTH DAKOTA    
   Operator Code:                            
   Operator:                                                                       
   Owner Name:                                                         

Narrative

WHILE ENTERING THE AIRPORT TRAFFIC AREA, UNDER POSITIVE CON TROL, THE 
   AIRCRAFT WAS STRUCK ON THE BOTTOM OF THE STABILIZER BY THE PROPELLER OF 
   ANOTHER AIRCRAFT ALSO ENTERIN G THE PATTERN.  THE AIRCRAFT PROCEEDED TO 
   ENTER THE PATTERN, EXECUTE A TOUCH AND GO THEN LAND TO A FULL STOP.  T 
   HE PILOT WAS UNAWARE OF THE DAMAGE AND THE NEXT USER OF THE AIRCRAFT 
   FOUND THE DAMAGE ON THE PREFLIGHT INSPECTION.  THE CONVERGING 
   AIRCRAFT'S PROPELLER HAD MADE TWO SLASHED IN THE BOTTOM OF THE 
   HORIZONTAL STABILATOR AND TRIM TAB.

Sequence of Events

Occurrence #: 1  270 MIDAIR COLLISION
   Phase of Operation: 560 APPROACH

           Findings
           Subject - Modifier - Personnel Cause/Factor

   1b.   24021(S) - 3115(M) - 4000(P)  Cause
         VISUAL LOOKOUT - INADEQUATE - PILOT IN COMMAND

Probable Cause

INADEQUATE VISUAL OUTLOOK BY THE PILOT IN COMMAND.  INADEQUATE VISUAL 
   OUTLOOK BY THE PILOT OF THE OTHER AIRCRAF T.

Aircraft Information

Number of Seats:                      4  
   Aircraft Use:                         INSTRUCTIONAL      
   Type of Operation:                    14 CFR 91 
   Domestic/International:                            
   Passenger/Cargo:                                        
   Registration Number:                  114ND 
   Air Carrier Operating Certificates:   
   Aircraft Fire:                        NONE

                  Injuries
          Fatal  Serious  Minor  None
   Crew      0       0       0      1
   Pass      0       0       0      0
   Other     0       0       0      1
   Invlvd    0       0       0      2

   Landing Gear:                         TRICYCLE-FIXED
   Certificated Maximum Gross Weight:    2325
   Engine Make:                          LYCOMING     
   Engine Model:                         O-320-D3G    
   Number of Engines:                    1 
   Engine Type:                          RECIPROCATING-CARBURETOR    

Environment/Operations Information

Basic Weather Conditions:             VISUAL METEOROLOGICAL CONDITIONS (VMC)  
   Wind Direction (deg):                 50
   Wind Speed (knots):                   7
   Visibility (sm):                      20
   Visibility RVR (ft):                  0
   Visibility RVV (sm):                  0
   Cloud Height Above Ground Level (ft): 3500
   Visibility Restrictions:              NONE
   Precipitation Type:                   NONE
   Light Condition:                      DAYLIGHT
   Departure Airport Id:                 GFK 
   Departure City:                       GRAND FORKS
   Departure State:                      ND
   Destination Airport Id:                   
   Destination City:                     
   Destination State:                      
   Flight Plan Filed:                    NONE
   ATC Clearance:                        
   VFR Approach/Landing:                 TRAFFIC PATTERN
   Event Location:                       OFF AIRPORT/AIRSTRIP

Pilot-in-Command

Certificates:                         PRIVATE
   Ratings:
     Plane:                              SINGLE ENGINE LAND
     Non-Plane:                          NONE
     Instrument:                         NONE
   Had Current BFR:                      YES
   Months Since Last BFR:                2  
   Medical Certificate:                  CLASS 3
   Medical Certificate Validity:         VALID MEDICAL-WITH WAIVERS/LIMITATIONS

              Flight Time (Hours)
   Total       :     75  Last 24 Hrs :    1
   Make/Model  :     75  Last 30 Days:   11
   Instrument  :      3  Last 90 Days:   15
   Multi-Engine:      0  Rotorcraft  :    0