On November 17, 1992, a Ryan NAVION (registration N4488K) operated by Michael G. Quinlan was involved in an aviation accident near Dublin, VA. Investigators recorded the probable cause as: IMPROPER ADJUSTMENT OF THE FUEL PRESSURE REGULATOR WHICH PRODUCED AN INADEQUATE FUEL FLOW AND SUBSEQUENT FUEL STARVATION. FACTORS RELATED TO THE ACCIDENT WERE: THE ROUGH TERRAIN AND TREES IN THE EMERGENCY LANDING AREA. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 1 related events involving the same aircraft type or operator are linked below.
A pilot reported engine stoppage during cruise. With fuel available but unable to restart, an emergency wheels-up landing was made on rough terrain, sliding into a tree. Investigation found a fuel pressure regulator set to minimum pressure, providing only 4 PSI against required 10 PSI.
Accident Description
During cruise flight, the pilot reported that the engine stopped running. Although fuel was available, the engine could not be restarted. The pilot executed an emergency landing with the landing gear retracted on rough terrain. After touchdown, the airplane slid into a tree.
Investigation
Examination of the fuel system revealed that the fuel pressure regulator had been adjusted to a minimum pressure setting. Measurements indicated that approximately 4 PSI of fuel pressure was available, whereas the pressure carburetor required a minimum of 10 PSI to function. In a test, the line from the engine-driven fuel pump to the fuel pressure regulator was blocked; under that condition, fuel pressure exceeded 15 PSI. No reason was found for the improper adjustment of the regulator.
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