AN MD SUPER 80 WITH THE L ENG FAILED; RETURNED TO THE FIELD; AND LANDED OVERWT.

Narrative

OVERWT LNDG WAS MADE AT ORD ON JUL/XX/97 AT XA30Z USING CAPT'S AUTH. LNDG WAS MADE ON RWY 27L AT A WT OF 138000 LBS USING 28 DEG FLAPS. TOUCHDOWN WAS SMOOTH AT 300 FPM AND ROLLOUT WAS NORMAL. RETURNED FOR LNDG AT ORD BECAUSE OF A L OIL PRESSURE LOW LIGHT AND ZERO OIL PRESSURE AT XA07Z. ABNORMAL 'ENG 10' WAS FOLLOWED AND L ENG WAS REDUCED TO IDLE FOR REMAINDER OF FLT; AND APU WAS STARTED. L OIL QUANTITY WAS 16 QTS; L N2 WAS 87 PCT. L OIL TEMP WAS 43 DEGS AND L EGT WAS 400 DEGS. TIME OF IDLE OP WAS 23 MINS. RWY LIMITED LNDG AND CLB LIMITED WT WAS REVIEWED AND FOUND TO BE WELL BELOW LIMITS FOR TEMP AND RWY 27L. INSIDE THE RWY 27L OM; AT ABOUT 1500 FT AGL; THE L GENERATOR TRIPPED OFFLINE AND WAS PICKED UP BY THE APU. FO ADVANCED L THROTTLE BUT ENG DID NOT SPOOL UP BUT THERE WAS STILL N2 ROTATION. AFTER ROLLOUT FO NOTICED L EGT AT 800 DEGS AND SO L FIRE HANDLE WAS PULLED AND L FUEL LEVER PUT TO OFF. EGT IMMEDIATELY STARTED TO DECREASE. TWR NOTED NOTHING UNUSUAL WITH THE L ENG AND NEITHER DID A PASSING CREW. INITIALLY THIS STARTED OUT AS A PRECAUTIONARY LNDG. AS A RESULT; I DID NOT DECLARE AN EMER OR REQUEST THE CFR EQUIP. IN HINDSIGHT THOUGH; I WISHED I HAD REQUESTED CFR AND UPON REVIEW OF PART 1; I NOTED THAT AN OVERWT LNDG IS CONSIDERED AN EMER. IT'S OBVIOUS NOW THAT THE ENG SHOULD HAVE BEEN SHUT DOWN. HOWEVER; THE ABNORMAL PROC GIVES THE OPTION OF SHUTDOWN OR OP AT REDUCED THRUST. MAYBE THIS SHOULD BE CHANGED TO A MANDATORY SHUTDOWN. ALSO; I HAVE BEEN TOLD AT THE SCHOOL HOUSE THAT THESE ENGS CAN OPERATE WITH ZERO OIL PRESSURE FOR 30 MINS. I DON'T THINK THAT THIS SHOULD BE STATED BECAUSE IT GIVES A FALSE SENSE OF SECURITY. I CERTAINLY USED IT IN MY DECISION MAKING PROCESS AND NOW I'M SORRY I DID. I WOULD LIKE TO KNOW EXACTLY WHAT HAPPENED TO THIS ENG AND WHAT KIND OF DAMAGE WAS DONE TO IT.