LGT ACR ACFT'S HYD SYS FAILED RESULTING IN AN EMER DECLARED AND LNDG.

Narrative

R HYD LIGHT CAME ON INFLT (LOW PRESSURE). R HYD GAUGE FAILED TO OFF-SCALE HIGH READING. REFERRED TO INFLT QRH PROC FOR ACR MLG AND CHKLIST DOES NOT CONTAIN A PROC FOR LOW PRESSURE AND ABNORMAL HIGH QUANTITY INDICATION. ATTEMPTED HYD PRESSURE LOW AND QUANTITY NORMAL CHKLIST; PLACED R ENG TO HIGH (NO PRESSURE). RUDDER MANUAL CTL LIGHT CAME ON AT THIS POINT AND AS WE HAD NO RELIABLE QUANTITY INDICATION; WE ENTERED CHKLIST FOR HYD QUANTITY AND PRESSURE LOW AS WE FELT FLUID WAS DEPLETED AND DID NOT WANT TO DAMAGE PUMPS BY TRIAL AND ERROR TROUBLE- SHOOTING. MY THOUGHTS AT TIME WERE TO NOTIFY DISPATCH OF PROB; LET FLT ATTENDANTS KNOW WE WERE GOING TO RDU. PREPARED ACFT FOR WORST CASE (HYD LOW AND QUANTITY LOW); LAND AT RDU VERSUS FAY FOR CRASH RESCUE/MAINT. IN SHORT; A LOT WAS GOING ON HERE. WE ACCOMPLISHED CHKLIST; DECLARED EMER AND LANDED NORMALLY FOR LOSS OF R SYS. GEAR WAS PINNED AFTER LNDG AND TAXIED TO GATE. THIS SEQUENCE OF EVENTS COULD HAVE BEEN MADE BETTER BY TURNING ON THE R AUX PUMP EVEN THOUGH THE CHKLIST DOES NOT SAY TO DO THIS FOR PRESSURE LOW AND QUANTITY HIGH. THE PROB IS THAT OUR PROCS ARE INCOMPLETE AND ASSUME YOU WILL 'PLAY' WITH ALL ASSOCIATED SWITCHES; EVEN THOUGH THE STATUS OF THE SYS IS UNKNOWN. THIS IS NOT PRUDENT. YOU COULD AGGRAVATE CERTAIN HYD FAILURES BY DOING THIS; I.E.; LARGE LEAKS. SPECIFICALLY; ALL OPERATORS SHOULD BE AWARE THAT QUANTITY GAUGE GOES OFF SCALE HIGH WHENEVER PRESSURE IS LOST AT ALT (BY LEAK OR PUMP FAILURE). OUR PROC SHOULD SAY: HYD PRESSURE LOW AND QUANTITY NORMAL/HIGH; INSTEAD OF HYD PRESSURE LOW AND QUANTITY NORMAL. THEN YOU HAVE A PLACE TO ENTER CHKLIST AND DON'T HAVE TO GUESS WHAT TO DO. AIRWORTHINESS DIRECTIVE SHOULD BE ISSUED. WILL PREVENT GEAR DOOR SKID USAGE ON LNDG.