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NTSB AVIATION ACCIDENT/INCIDENT DATABASE REPORT


General Information

Data Source:                          NTSB AVIATION ACCIDENT/INCIDENT DATABASE
   Report Number:                        CHI94LA087 
   Local Date:                           02/13/1994
   Local Time:                           14:33 CST
   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:                        AIRPLANE       
   Aircraft Damage:                      SUBSTANTIAL      
   Phase of Flight:                      570 LANDING                                           
   Aircraft Make/Model:                  PIPER PA-44-180                 
   Operator Doing Business As:                                         
   Operator Name:                                                      
   Operator Code:                            
   Operator:                                                                       
   Owner Name:                           UNIVERSITY OF NORTH DAKOTA    

Narrative

WHEN THE LANDING GEAR WAS EXTENDED FOR LANDING, THE RIGHT MA IN LANDING 
   GEAR LIGHT BEGAN FLASHING AND AN UNSAFE GEAR WARNING WAS RECEIVED.  
   SEVERAL ATTEMPTS WERE MADE TO ASSURE THE LANDING GEAR WAS EXTENDED 
   INCLUDING REPEATED ATTEMPTS AT NORMAL AND EMERGENCY GEAR EXTENSION.  
   UPON LANDING THE RI GHT MAIN GEAR COLLAPSED.  SUBSEQUENT EXAMINATION 
   REVEALED THAT A COTTER PIN ON THE RIGHT MAIN LANDING GEAR SCISSORS HA D 
   BEEN OPEN AND CAUGHT A WIRING BUNDLE IN THE WHEEL WELL WHICH PREVENTED 
   THE DOWN LOCK FROM ENGAGING.

Sequence of Events

Occurrence #: 1  190 GEAR COLLAPSED
   Phase of Operation: 571 LANDING - FLARE/TOUCHDOWN

           Findings
           Subject - Modifier - Personnel Cause/Factor

   1a.   10431(S) - 1226(M)  Factor
         LANDING GEAR, MAIN GEAR STRUT SCISSORS - NOT SAFETIED
   1b.   24111(S) - 3109(M) - 4108(P)  Cause
         MAINTENANCE, INSTALLATION - IMPROPER - OTHER MAINTENANCE PERSONNEL
   2b.   22002(S) - 3131(M) - 4103(P)  Factor
         GEAR EXTENSION - NOT POSSIBLE - PILOT IN COMMAND (CFI)

Probable Cause

THE IMPROPER MAINTENANCE INSTALLATION (COTTER PIN) BY OTHER MAINTENANCE 
   PERSONNEL.  FACTORS WERE MAIN LANDING GEAR SCISSORS NOT SAFETIED 
   PROPERLY AND EXTENSION OF LANDING GEARNOT POSSIBLE BY PILOT-IN-COMMAND (CFI).

Aircraft Information

Number of Seats:                      4  
   Aircraft Use:                         INSTRUCTIONAL      
   Type of Operation:                    14 CFR 91 
   Domestic/International:                            
   Passenger/Cargo:                                        
   Registration Number:                  190ND 
   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:                         TRICYCLE-RETRACTABLE
   Certificated Maximum Gross Weight:    3800
   Engine Make:                          LYCOMING     
   Engine Model:                         O-360-A1H6   
   Number of Engines:                    2 
   Engine Type:                          RECIPROCATING-CARBURETOR    

Environment/Operations Information

Basic Weather Conditions:             VISUAL METEOROLOGICAL CONDITIONS (VMC)  
   Wind Direction (deg):                 150
   Wind Speed (knots):                   14
   Visibility (sm):                      10
   Visibility RVR (ft):                  0
   Visibility RVV (sm):                  0
   Cloud Height Above Ground Level (ft): 10000
   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:                        VFR
   VFR Approach/Landing:                 FULL STOP
   Event Location:                       ON AIRPORT

Pilot-in-Command

Certificates:                         COMMERCIAL
   Ratings:
     Plane:                              SINGLE ENGINE LAND, MULTIENGINE LAND, SINGLE ENGINE SEA
     Non-Plane:                          NONE
     Instrument:                         AIRPLANE
   Had Current BFR:                      YES
   Months Since Last BFR:                6  
   Medical Certificate:                  CLASS 1
   Medical Certificate Validity:         VALID MEDICAL-WITH WAIVERS/LIMITATIONS

              Flight Time (Hours)
   Total       :   1417  Last 24 Hrs :    1
   Make/Model  :    120  Last 30 Days:   70
   Instrument  :    133  Last 90 Days:  106
   Multi-Engine:    200  Rotorcraft  :    0

NTSB Identification: CHI94LA087. The docket is stored in the (offline) NTSB Imaging System.

 

Accident occurred FEB-13-94 at GRAND FORKS, ND
Aircraft: PIPER PA-44-180, registration: N190ND
Injuries: 2 Uninjured.

WHEN THE LANDING GEAR WAS EXTENDED FOR LANDING, THE RIGHT MAIN LANDING GEAR LIGHT BEGAN FLASHING AND AN UNSAFE GEAR WARNING WAS RECEIVED. SEVERAL ATTEMPTS WERE MADE TO ASSURE THE LANDING GEAR WAS EXTENDED INCLUDING REPEATED ATTEMPTS AT NORMAL AND EMERGENCY GEAR EXTENSION. UPON LANDING THE RIGHT MAIN GEAR COLLAPSED. SUBSEQUENT EXAMINATION REVEALED THAT A COTTER PIN ON THE RIGHT MAIN LANDING GEAR SCISSORS HAD BEEN OPEN AND CAUGHT A WIRING BUNDLE IN THE WHEEL WELL WHICH PREVENTED THE DOWN LOCK FROM ENGAGING.
Probable Cause
the improper maintenance installation (cotter pin) by other maintenance personnel. Factors were main landing gear scissors not safetied properly and extension of landing gear not possible by pilot-in-command (CFI).

Full Narrative:

On February 13, 1994, at 1433 central standard time, a Piper PA- 44-180, N190ND, registered to University of North Dakota, and operated by a flight instructor and student, experienced a collapse of the right main landing gear on touchdown at the Grand Forks International Airport, Grand Forks, North Dakota. The airplane sustained substantial damage. The occupants reported no injuries. The 14 CFR Part 91 flight was operating in visual meteorological conditions. No flight plan was on file. The local instructional flight departed Grand Forks, North Dakota, at 1345.

The instructor pilot stated that when the landing gear was extended the right main landing gear light began flashing and an unsafe gear warning light was illuminated. Several attempts were made to assure that the landing gear was extended including repeated attempts at normal and emergency gear extension. Maintenance personnel were contacted by radio in an attempt to alleviate the problem. A low pass was made over the airport to attempt to determine if the gear appeared to be extended. The tower reported that the gear appeared to be down. Upon landing the right main landing gear collapsed.

A subsequent examination revealed that a cotter pin on the right main landing gear scissors was open and caught a wiring bundle in the wheel well which prevented the down lock from engaging.

Source: National Transportation Safety Board