BRIDGEPORT, TX, USA
N84103
CESSNA 172K
DURING FLT, THE PLT NOTED A PROGRESSIVE LOSS OF ENG POWER. THE APPLICATION OF CARBURETOR HEAT HAD NO EFFECT. SUBSEQUENTLY, A LOUD NOISE OCCURRED & THE PLT SHUT DOWN THE ENG. DURING A FORCED LANDING THE NOSE GEAR COLLAPSED & THE ACFT NOSED OVER. AN EXAM REVEALED THAT THE #4 CONNECTING ROD HAD FAILED. INTERNAL DAMAGE WAS FOUND TO HAVE OCCURRED DUE TO LACK OF LUBRICATION. A FURTHER EXAM REVEALED THAT THE DIAPHRAGM OF AN OIL PRESSURE SWITCH HAD RUPTURED & ALLOWED DEPLETION OF THE ENG OIL SUPPLY. THE SWITCH, DATCON PN 40558-1, WAS INSTALLED ON 1/1/74, DIRECTLY INTO THE ENG BLOCK (TAPPED OIL GALLERY HOLE) & WAS USED IN CONNECTION WITH ELECTRICAL ACTION OF THE ACFT'S HOURMETER. DATCON SERVICE BULLETIN #1, SUBJECT: HAZARDOUS INSTALLATION OF OIL PRESSURE SWITCHES, DATED 1/2/75, NOT COMPLIED WITH.
Source: NTSB Aviation Accident Database
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