A B757-200 ON CLBING THROUGH FL240 DECLARED AN EMER AND DIVERTED DUE TO R AIR CONDITIONING PACK FAILED. ACFT DISPATCHED WITH L PACK DEFERRED INOP.

Narrative

THIS FLT DISPATCHED WITH THE L AIR CONDITIONING PACK INOP. DURING OUR CLBOUT; THROUGH FL240; OUR R AIR CONDITIONING PACK FAILED. WE FOLLOWED THE QRH FIRST; AS ATC CLRED US TO COMMENCE OUR DSCNT TO 10000 FT. DURING THIS DSCNT; THE CABIN CLBED AT APPROX 1800 FPM FROM ABOUT 5500 FT. ATTEMPTS TO RESET THE PACK BY HITTING THE RESET SWITCH AND CYCLING THE MAIN AIR CONDITIONING SWITCH AND BLEED AIR VALVE WERE NOT MET WITH SUCCESS. DURING THIS TIME; AN EMER WAS DECLARED. THE CAPT REFUSED TO ALLOW THE FO TO DECLARE AN EMER. AFTER A QUERY FROM ATC; THEY (CTR CTL) DECLARED ONE FOR US. THIS VERY BRIEF TIME LAG HAD NO EFFECT ON THE TIMELINESS OF OUR DSCNT. THE FO FINALLY RE-ESTABLISHED THE R AIR CONDITIONING PACK; AFTER THE ACFT WAS IN STABLE FLT AT 10000 FT. HE DID SO; WITH THE CAPT'S PERMISSION; BY PULLING AND RESETTING 3 CIRCUIT BREAKERS RELATED TO THIS PACK'S OP. WE WERE APPROX 134 MI W OF THE CLT VOR WHEN THIS INCIDENT OCCURRED. THE CAPT ELECTED TO RETURN TO CLT; INITIALLY AT 9000 FT. DURING THIS EVENT; THE CABIN NEVER CLBED TO OVER 10000 FT. THE APCH AND LNDG IN CLT WERE NORMAL.