A B737-300'S PRESSURIZATION FAILED AT FL366. THE CREW DECLARED AN EMERGENCY; DESCENDED; AND DIVERTED TO NEARBY AIRPORT.

Narrative

WHILE CLBING THROUGH FL366 TO FL370; CREW RECEIVED A CABIN ALT WARNING HORN. BOTH PLTS ACCOMPLISHED IMMEDIATE ACTION ITEMS (DON OXYGEN MASKS AND ESTABLISH COMS) REFERRED TO THE QRH FOR CABIN ALT WARNING HORN/ABNORMAL PRESSURIZATION PROC AND REQUESTED AND RECEIVED IMMEDIATE DSCNT CLRNC TO FL240. COMPLETED ALL STEPS IN QRH PROC FOR SITUATION; BUT WERE UNABLE TO REGAIN CTL OF CABIN PRESSURE. FOLLOWED ADDITIONAL QRH GUIDANCE AND INITIATED EMER DSCNT PROC TO 14000 FT MSL. PLTS CONSIDERED DIVERT OPTIONS AND DECIDED TO DIVERT TO ZZZ. LANDED UNEVENTFULLY AT ZZZ. ALTHOUGH I HAVE PRACTICED THIS VERY SAME PROC MANY TIMES IN THE SIMULATOR (AND IN THE ACFT IN MY MIL FLYING); THE DIFFICULTY IN COMMUNICATING WITH THE OTHER PLT CANNOT BE UNDERSTATED AND PRESENTS ONE OF THE GREATEST THREATS TO SUCCESSFUL DECISION MAKING IN AN UNUSUAL AND HIGH WORKLOAD ENVIRONMENT. COMS WITH ATC AND THE INFLT CREW REQUIRED MUCH LESS EFFORT THAN COMMUNICATING WITH THE OTHER PLT. THIS '180' FROM THE NORM IS COUNTER-INTUITIVE AND SIMPLY CREATES ANOTHER BARRIER IN A UNUSUAL AND DYNAMIC SITUATION. AS FAR AS THE PRESSURIZATION PROB; I HAVE NO IDEA. AN AIRPLANE IS A MACHINE AND THINGS SOMETIMES MALFUNCTION. THE TRAINING AND QRH GUIDANCE I RECEIVED HAVE BEEN EXCELLENT AND PROVED MORE THAN EFFECTIVE AT RESOLVING THE PROB TO A SUCCESSFUL OUTCOME. AS FAR AS THE COM ISSUE; A 'HOT MIKE' CAPABILITY COULD CERTAINLY PROVE USEFUL IN THIS SITUATION WHERE 1 PLT IS FLYING AND THE OTHER IS VERBALIZING A COMPLEX ABNORMAL PROC WHILE COMMUNICATING WITH NOT ONLY ATC; THE INFLT CREW; AND PAX; BUT THE OTHER PLT AS WELL.