NTSB Identification: CHI88LA117.
The docket is stored on NTSB microfiche number 36947.
Accident occurred Friday, May 20, 1988 in TERRE HAUTE, IN
Probable Cause Approval Date: 08/08/1989
Aircraft: PIPER PA-28R-200, registration: N55786
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

AFTER TAKEOFF FROM THE AIRPORT THE PILOT ATTEMPTED TO RETRACT THE LANDING GEAR. THE LANDING GEAR FAILED TO RETRACT SO THE PILOT DECIDED TO EXTEND THE GEAR. THE PILOT DID NOT GET A DOWN AND LOCKED INDICATION. HE THEN PULLED THE EMERGENCY EXTENSION KNOB BUT STILL DID NOT RECEIVE A DOWN AND LOCKED INDICATION. NEXT THE PILOT ATTEMPTED TO 'SHAKE' THE GEAR INTO POSITION, BUT ALL ATTEMPTS FAILED. THE PILOT THEN PROCEEDED TO THE HULMAN REGIONAL AIRPORT IN TERRE HAUTE, IN, WHERE HE RECEIVED INDICATIONS FROM THE TOWER THAT THE GEAR APPEARED TO BE DOWN AND LOCKED. THE PILOT THEN ATTEMPTED TO LAND AT THE AIRPORT AND UPON TOUCHDOWN THE RIGHT MAIN LANDING GEAR COLLAPSED. INVESTIGATION REVEALED THAT THE HYDRAULIC SYSTEM ELECTRIC MOTOR HAD FAILED. THE EMERGENCY SYSTEM FAILED BECAUSE THE MAIN LOCK HOOKS COULD NOT ENGAGE THE LOCK PINS DUE TO LACK OF LUBRICATION AND EXCESSIVE PAINT AND DIRT BUILD UP AROUND THE DOWN LOCK MECHANISM.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

HYDRAULIC SYSTEM,MOTOR..SHORTED

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

LANDING GEAR,GEAR LOCKING MECHANISM..CONTAMINATION

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

LANDING GEAR,GEAR LOCKING MECHANISM..BINDING(MECHANICAL)





Contributing Factors

MAINTENANCE,LUBRICATION..INADEQUATE..OTHER MAINTENANCE PERSONNEL

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