Analysis of information sources in references of the Wikipedia article "1957 Cebu Douglas C-47 crash" in English language version.
General Cabal said metal fatigue had broken a drive shaft that caused power failure aboard the twin-engine C-47 after takeoff from Cebu City on the Island of Cebu on a flight to Manila. He said that while the plane was gaining altitude, the spindle drive shaft of the right engine carburetor had snapped.