EMER EVACUATION.

Narrative

AFTER NORMAL LNDG AT SFO; WERE HOLDING BTWN RWYS 28R AND 28L. FO AND I NOTICED ABNORMAL SOUND AND MONITORED HYD SYS. HYD QUANTITY ON L SIDE WAS ZERO. WE WERE CLRED ACROSS RWY 28L WHEN FLT ATTENDANT CHIME SOUNDED. FLT ATTENDANT REQUESTED WE OPEN COCKPIT DOOR. WE SAW SMOKE COMING FROM REAR OF CABIN. I ORDERED FORWARD FLT ATTENDANT TO EVAC THROUGH FORWARD AIRSTAIR AS ONLY 59 PAX AND SMOKE WAS LIGHT. (WE RECOGNIZED SMELL AS SKYDROL.) AFTER DECLARING EMER AND ORDERING EMER MEN AND EQUIP; I COMPLETED EVAC CHKLIST. I ENTERED CABIN AND SAW THAT FLT ATTENDANT WAS GONE. PAX WERE GETTING BAGS AND MOVING SLOWLY. I YELLED AT PAX TO LEAVE LUGGAGE AND DEPLANE. PAX BEGAN TO MOVE MUCH QUICKER. I CHKED ALL SEATS AND LAVS AND DEPLANED THROUGH FORWARD AIRSTAIR. ON GND; I SAW PAX ON WING GOING BACK INTO CABIN THROUGH OVER-WING EXIT. I REENTERED ACFT THROUGH FORWARD AIRSTAIR AND RAN DOWN AISLE AND YELLED AT PAX TO GET BACK OUT ON WING. FIREMAN USED LADDER TO REMOVE PAX FROM WING. NO INJURIES TO PAX WERE INCURRED IN EVAC PROCESS. (WE HAD DETERMINED EARLIER THAT NO FIRE HAD OCCURRED.) CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR WAS FLYING AN EARLY MODEL MD-80. THE ACFT HAD BEEN DISPATCHED WITH 1 GENERATOR INOP USING THE APU IN FLT FOR ELECTRICAL PWR. THIS CAUSED THE TAIL CONE TO BE VERY HOT. UPON STOWING THE REVERSERS; A 'B' NUT FAILED; DUMPING THE L HYD SYS FLUID INTO THE TAIL CONE. THE HOT APU VAPORIZED THE NON- FLAMMABLE 'SKYDROL' HYD FLUID AND SENT THE VAPOR INTO THE CABIN THROUGH THE AIR CONDITIONING SYS. AS 'SKYDROL' IS TOXIC TO HUMANS AND UNPLEASANT TO BREATHE; THE AFT FLT ATTENDANT ATTEMPTED TO CALL THE COCKPIT BY USING THE CHIME SYS. ON THE EARLY MODEL MD-80; RAPID RINGING OF THE CHIME SYS WILL CANCEL ITSELF OUT SO THAT NO CHIME IS HEARD IN THE COCKPIT. THE FORWARD FLT ATTENDANT CAME TO THE COCKPIT AND SAID SOMETHING LIKE 'DO YOU WANT US TO USE THE SLIDES OR THE FORWARD DOOR?' THIS IS THE FIRST INDICATION THAT THE COCKPIT HAD THAT THERE WAS A SERIOUS PROB. THE RPTING CAPT ORDERED THE AIRSTAIRS TO BE USED. THE AFT FLT ATTENDANT OPENED AN OVER-WING EXIT LETTING PEOPLE OUT ONTO THE WING. THERE ARE NO SLIDES OFF OF THE WING IN THE MD-80. WHEN THE FORWARD FLT ATTENDANT SAW PEOPLE ON THE WING; SHE WENT OUTSIDE TO KEEP PEOPLE FROM JUMPING OFF OF THE WING. THIS LEFT NO ONE IN THE CABIN TO DIRECT OR EXPEDITE THE EVAC. THE RPTR DIRECTED THE REMAINING PAX OUT THE FORWARD DOOR. LADDERS WERE BROUGHT OUT TO GET PAX OFF OF THE WING. THE ACR HAS CHANGED ITS PROCS REGARDING EVAC -- FLT ATTENDANTS NOW HAVE THE 'AUTONOMY' TO START AN EVAC WHEN THEY DEEM IT NECESSARY.