EMER DECLARED BY MD80 FLT CREW WHEN HAVING TO EXTEND THEIR LNDG GEAR BY EMER SYS ON APCH TO SLC; UT.

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AT 18000 FT; CALLED FOR IN-RANGE (LNDG N) LEVELING 16000 FT AND SLOWED TO 230 KTS. CALLED FOR SLATS AND SAW OPPOSITE MOVEMENT BTWN R AND L HYD PRESSURE NEEDLES. SAW R HYD QUANTITY ABOUT 1 QUART. TURNED OFF R PUMPS TO SAVE QUANTITY; CALLED FOR QRH LOST QUANTITY. TOLD APCH OF PROB; ASKED FOR RWY 34L. WITH PUMPS ON; GEAR WOULDN'T DROP AND QUANTITY ALMOST ZERO. DID ALTERNATE GEAR EXTENSION QRH. COULDN'T REACH SLC OPS TO GET TUG AND MAINT. ASKED APCH FOR EMER EQUIP AND WE WOULD NEED TO STOP ON RWY. LANDED WITH GEAR DOORS DRAGGING ALMOST MAX WT (128000 LBS) HIGH ALT. GND SPD WAS HIGH AND GEAR DOOR SKIDS SCRAPED OFF 3-4 SECONDS AFTER TOUCHING ACCORDING TO EMER CREWS WHO SAW SPARKS AS WE ROLLED OUT. USED JUMP SEAT RIDER TO BRIEF FLT ATTENDANTS BECAUSE OF COMPRESSED TIME. SLC EMER CREWS WITH DESIGNATED RADIO EXCELLENT; IMMEDIATELY RESPONDED TO QUESTIONS AND REQUEST (NO SMOKE; NO FIRE; GEAR DOORS NOT BENT). OPS; AT OUT-STATIONS; NEED TO KEEP 1 PERSON AT OPS DESK RADIO SO ACFT CAN COMMUNICATE IMMEDIATELY AND CONTINUOUSLY FOR SPECIAL EQUIP; PERSONNEL AND HANDLING NEEDS DURING AN EMER UNTIL THE SIT CONCLUDES. THE RADIO DESK RELAYS VIA WALKIE-TALKIE TO RAMP/STATION PERSONNEL THE NEEDS OF THE STRICKEN ACFT. THIS DID NOT HAPPEN AT SLC.