A B757-200 flight crew in cruise experienced loss of left hydraulic system followed by loss of PTU (power transfer unit). They ran the checklists; declared an emergency; and landed at their destination.

Narrative

About 1 hour from ZZZ; Left Engine Hydraulic Pump EICAS. Ran checklist; turned off pump. Quantity was full. Approximately 15 minutes later; Left Hydraulic Quantity EICAS; checked status page; quantity now completely empty. Ran checklist. Discussed destination weather; runway length and fuel considerations. Talked over what would be inoperative if the PTU failed; what our plan would be; looked up the landing distance required under abnormal conditions. Weather at ZZZ was 700 FT broken; good visibility; calm winds. We planned an approach to Runway XXL (11;000 FT long). Advised Approach Control of our runway request and that we would like a long final. Advised the Purser of the problem and instructed her that this was a cabin advisory. First Officer was still flying at this time. We had planned to configure early to see if we had the PTU. As flaps went to 1 degree; got EICAS message of Flap Disagreement and PTU status message. At this point we declared an emergency; told approach that we needed vectors for 15 minutes or so and wanted to stay at 5;500 FT. I instructed the First Officer to take over the checklists and I took command of the aircraft. We advised Dispatch; called the Purser; and made a PA advising the passengers that we had a minor hydraulic problem; would be coming to a complete stop on the runway; and would need to be towed in. I handled the radios while the First Officer ran the checklists. We slowed; put out the flaps to 20 degrees via the alternate method. Took a turn to final approximately 5 miles from FAF; put gear down via alternate method. Landed with flaps 20 degrees; 174;000 LBS gross weight; and reference speed 139 KTS. Came to a complete stop on the runway; advised Flight Attendants and passengers to remain seated. Stayed on runway until tug hooked up and towed us to the gate. Successful outcome of the emergency. I had this exact scenario on my PC in September and everything I did today mirrored my actions back then. Good training! My First Officer and I worked well together and handled all facets of the situation. There is not a thing I would change (except having the PTU work!). Supplemental information from ACN 821277: In my opinion; good checklists; good discussion between pilots; and good training; led to a successful execution of a difficult irregular procedure.