A DC8-63 ATTEMPTS A 180 DEG TURN ON THE RWY AND EXPERIENCES A COLLAPSING OF THE RWY'S 'SAFETY ZONE' EDGE; ALLOWING THE ACFT TO SETTLE ON ITS #1 AND #2 ENG AT SPQT; FO.

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FLT FROM MIA TO IQUITOS; PERU. AFTER NORMAL LNDG AND STOPPING THE ACFT; WE INITIATED A 180 DEG TURN FROM L TO R; SINCE THERE IS NO TURNAROUND LOOP OR TXWYS. AFTER COMPLETING THE TURN; THE ACFT MOMENTUM WAS LOST. WE ADDED PWR AS YOU NORMALLY DO TO COMPLETE THE TURN -- ESPECIALLY WHEN ACFT IS HVY. AT THIS TIME WE REALIZED THAT ACFT DID NOT MOVE FORWARD. PWR WAS TAKEN OFF AND CAPT (ME) OPENED L WINDOW AND REALIZED THE ACFT WAS STUCK. WE COMPLETED THE SHUTDOWN. UPON EXITING ACFT; WE SAW THE TARMAC ON SAFETY ZONE HAD GIVEN IN UNDER THE L MAIN GEAR. DUE TO INCLINATION OF GEAR CAVING IN ON TARMAC; #1 AND #2 ENGS CAME TO REST ON THE GRASS. UPON FURTHER INSPECTION ON #1 ENG; WE FOUND 2 FAN BLADES SLIGHTLY CHIPPED AND 3-4 SLIGHTLY BENT AT THE TIPS. MINIMAL SCRATCHES ON BOTTOM OF ENG DUE TO ENG COMING TO REST ON TOP OF VASI LIGHT. #2 ENG HAD NO DAMAGE INTERIOR OR EXTERIOR. #1; #5; #6 TIRES HAD SLASH MARKS DUE TO CAVE-IN OF CONCRETE BUT WERE FULLY INFLATED. ACFT WAS PULLED OFF AND INSPECTED; FIXED AND RELEASED THE NEXT DAY TO LIMA; PERU. NO TURNAROUND LOOP. SAFETY EDGE OF RWY TOO SOFT.