FLC OF ACR LGT ACFT MADE A SUCCESSFUL EMER LNDG AFTER USING ALTERNATE MEANS TO LOWER THE L LNDG GEAR DUE TO A HYD FAILURE.

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ON MAR/XX/93; I WAS THE CAPT ON ACR FLT LAX-PIT; WHICH WAS AN LGT. ENRTE A L HYD QUANTITY EICAS MESSAGE APPEARED. THIS WAS FOLLOWED SHORTLY BY THE LOSS OF ALL L HYD QUANTITY. THE APPROPRIATE ABNORMAL CHKLIST WAS ACCOMPLISHED AND THE 'ALTERNATE FLAP OP' AND 'ALTERNATE GEAR EXTENSION' ABNORMAL CHKLISTS WERE REVIEWED IN ANTICIPATION OF OUR ARR IN PIT. UPON ARR IN PIT TERMINAL AREA; THE ALTERNATE FLAP OP PROCEEDED NORMALLY. HOWEVER; WHEN THE ALTERNATE GEAR EXTENSION SWITCH WAS PUSHED THE NOSE GEAR AND R MAIN GEAR EXTENDED NORMALLY; BUT THERE WAS NO GREEN LIGHT ON THE L MAIN GEAR. A GEAR DISAGREE LIGHT EICAS MESSAGE APPEARED AND THERE WAS A GEAR DOOR LIGHT. A MISSED APPROACH WAS EXECUTED. THE ACFT WAS OBSERVED BY CFR PERSONNEL AS IT PASSED OVER THE ARPT. THE CFR PERSONNEL RPTED THAT THE NOSE GEAR AND R MAIN GEAR WERE DOWN AND THAT THE L MAIN GEAR DOOR WAS OPEN BUT THE GEAR APPEARED RETRACTED. WE DECLARED AN EMER AND THEN PROCEEDED TO A HOLDING PATTERN AND CONFERRED WITH COMPANY MAINT PERSONNEL BY RADIO. THE 'GEAR DISAGREE' AND 'GEAR DOORS' ABNORMAL PROCS WERE COMPLIED WITH. IT WAS THEN DECIDED TO APPLY A POSITIVE 'G' LOAD TO THE ACFT. THIS RESULTED IN THE DISAPPEARANCE OF THE 'GEAR DISAGREE' EICAS MESSAGE. HOWEVER; THERE WAS NO GREEN LIGHT ON THE L MAIN GEAR. IT WAS THEN DECIDED TO MAKE A TOUCH-AND-GO LNDG TO ASSIST IN LOCKING DOWN THE L MAIN GEAR. THIS WAS ACCOMPLISHED AND CFR PERSONNEL NOW RPTED THAT THE L MAIN GEAR APPEARED DOWN. AS WE FLEW AROUND THE ARPT FOR THE FINAL APCH AND LNDG; THE FLT ATTENDANTS COMPLETED THE CABIN PREPARATION AND BRIEFING IN THE EVENT AN EVAC WAS NECESSARY ON LNDG. I HELD THE L MAIN GEAR OFF AS LONG AS POSSIBLE. ROLLOUT WAS NORMAL AND TURN OFF THE RWY USING DIFFERENTIAL BRAKING WAS ACCOMPLISHED. THE ACFT WAS TOWED TO THE TERMINAL.