NTSB Identification: CHI89LA065.
The docket is stored on NTSB microfiche number 39513.
Accident occurred Thursday, March 30, 1989 in MONEE, IL
Probable Cause Approval Date: 06/10/1991
Aircraft: PIPER PA-28-235, registration: N55191
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.

DRG FLT AT NGT, THERE WAS A LOSS OF OIL PRESSURE & THE ENG FAILED. VECTORS WERE PROVIDED TO THE NEAREST ARPT, BUT THE RWY LGTS COULD NOT BE ACTIVATED FM THE AIR, EXCEPT BY PRIOR REQUEST. DRG AN EMERG LNDG IN A NRBY FLD, THE NOSE GEAR HIT A DITCH & COLLAPSED. A TEARDOWN INSPN REVEALED ALL CAM LOBES WERE SPALLED OR PITTED, WITH LOBES FOR CYL #1 EXCESSIVELY WORN. CAM FOLLOWERS FOR CYL #1 & #3 WERE DAMAGED & HAD PRODUCED METAL. ALL OTR CAM FOLLOWERS WERE SPALLED OR PITTED. THEPISTON PIN PLUGS WERE WORN, WHICH CONTRIBUTED ALUMINUM TO THE OIL SYS. OIL PORTS & GALLEYS WERE FILLED WITH METAL FRAG- MENTS, RESTRICTING THEIR DIAMETERS. ALUMINUM & STEEL PARTICLES WERE FND IN THE OIL, FILTER & SUMP. THE #5 CONNECTING RODHAD FAILED & THE RESPECTIVE BOLTS WERE NECKED DWN & PULLED APART. THE OTR ROD BEARINGS WERE EITHER SEIZED OR WERE HARD TO TURN. THE PLT HAD NOTICED METAL FRAGMENTS DRG A RECENT OIL CHANGE, BUT WAS NOT CERTAIN OF WHAT THIS INDCD. RPRTDLY, A MECHANIC HAD ADZD HIM THAT THE FRAGMENTS WERE NOT SIGNIFICANT.

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

INADEQUATE MAINTENANCE/INSPECTION OF THE AIRCRAFT AFTER METAL FRAGMENTS WERE FOUND IN THE OIL, AND WORN CAM LOBES/FOLLOWERS/PISTON PIN PLUGS, WHICH RESULTED IN OIL CONTAMINATION, RESTRICTION (BLOCKAGE) IN THE OIL SYSTEM, OIL STARVATION, AND SUBSEQUENT ENGINE (CONNECTING ROD) FAILURE. FACTORS RELATED TO THE ACCIDENT WERE: DARK NIGHT, LACK OF RUNWAY LIGHTS AT THE NEARBY AIRPORT, AND A DITCH IN THE EMERGENCY LANDING AREA.

Index for Mar1989 | Index of months