Philippine Airlines Flight S26
Philippine Airlines Flight S26 was a domestic flight operated by Philippine Airlines that departed from Mandurriao Airport in Iloilo on 23 November 1960 at 5:30 p.m. PHT to Manila International Airport near Manila. At 6:33 p.m.  the crew gave its last position report before crashing on the slopes of Mount Baco in the island of Mindoro at . The wreckage was found on 30 November and there were no survivors. Aircraft 
The aircraft was a Douglas DC-3 manufactured in the United States during World War II and purchased by Philippine Airlines in 1946. The plane was acquired in 1948 and registered as PI-C142 a year later. In 1953, PI-C142 made a forced landing in a rice paddy near Tuguegarao with no fatalities. It was repaired and re-registered to PI-C133 in 1954. The plane had around 18,000 flight hours at the time of the crash. Probable cause 
The probable cause was possibly a navigational error, as there were adverse weather conditions, poor visibility, a 25-knot eastern crosswind and a possible malfunction of the airborne navigational equipment due to atmospheric disturbance and night and terrain effects. References 

S26
Aviation accidents and incidents in 1969
20th-century aviation accidents and incidents
Aviation accidents and incidents in the Philippines
Accidents and incidents involving the Douglas DC-3
Airliner accidents and incidents involving controlled flight into terrain
1969 disasters in the Philippines