What was found
DURING A MFG PROGRESSIVE INSPECTION PROGRAM 50 HOUR INSPECTION, DISCOVERED ENGINE FUEL FLOW TO BE 13.9 GALLONS PER HOUR. IN THIS CASE WE WERE NOT ABLE TO ADJUST THE FUEL FLOW TO WITHIN LIMITS IAW CMI SID97-3F. PUMP WAS REPLACED. WE HAVE ESTABLISHED AN OPERATIONAL MINIMUM FUEL FLOW OF 16.0 GALLONS IAW HOUR DUE TO OUR EXPERIENCE WITH THESE ENGINE DRIVEN FUEL PUMP ANEROID FAILURES. WHEN THE ALTITUDE COMPENSATING ANEROID FAILS IN THE FUEL PUMP, THE FUEL FLOW WILL DROP FROM THE NORMAL 16.5 TO 17.5 GALLONS PER HOUR TO THE 12 TO 14 GALLONS PER HOUR RANGE. EXTENDED OPERATIONS WITH LOW FUEL FLOW CAN LEAD TO ENGINE DAMAGE BASED ON OUR OPERATING EXPERIENCE.