NTSB Identification: CHI85FEX03.
The docket is stored on NTSB microfiche number 28516.
Accident occurred Thursday, June 20, 1985 in ORLEANS, IN
Aircraft: PIPER PA-28-180, registration: N7750N
Injuries: 1 Serious.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

DURING FLT, THE PLT NOTED THAT THE ENG RPM DROPPED FROM 2500 TO 2000. HE COULD NOT RESTORE THE RPM. HE THEN HEARD A LOUD NOISE FROM THE ENG COMPARTMENT & THE ENG SEIZED. SUBSEQUENTLY, THE ACFT WAS DAMAGED DURING AN EMERG LANDING IN A CORN FIELD. A TEARDOWN OF THE ENG REVEALED THAT THE #3 ROD, PN 74502-S, WAS BROKEN, BENT & WEDGED BETWEEN THE #4 ROD & ENG CASE. THE #3 BEARING SURFACE ON THE CRANKSHAFT WAS GALLED & BOTH ROD BOLTS ON THE #3 CONNECTING ROD WERE BROKEN. ALSO, THE #2 & #4 CONNECTING ROD BEARINGS, PN 72218, HAD SPUN. METAL PARTICALS WERE FOUND THRU-OUT THE ENG. THERE WAS STILL 5-1/2 QTS OF OIL IN THE ENG.

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

ENGINE ASSEMBLY,CONNECTING ROD..FAILURE,TOTAL


Contributing Factors

TERRAIN CONDITION..CROP


Contributing Factors

TERRAIN CONDITION..ROUGH/UNEVEN


Contributing Factors

TERRAIN CONDITION..SOFT

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