Narrative:

Flying at FL430, en route to dfw, the cabin went into emergency pressurization. The cabin altitude was at 6500 ft and therefore there was no reason for emergency pressurization to have activated. An attempt was made to try to reset the right bleed air, then back to on, and then the left bleed air and then back to on. The system would not reset. We asked ZTL for a lower altitude. Center assigned FL330 and we started our descent. At FL330, and a cabin altitude of 4500 ft, we made another attempt to reset the bleed air with no success. Due to the noise level that emergency pressurization causes, and improper use of aircraft interphone system, the first officer misunderstood my intentions of wanting a lower altitude and vectors to the nearest suitable airport as needing priority handling, and ended up declaring an emergency. Center gave us vectors and descent for cha, tn. Upon reaching 5000 ft MSL, we tried to reset the pressurization one more time. The system still would not reset. I asked the first officer for the completion of the 'before landing checklist' and at that time he found that the 'emergency bleed' circuit breaker had tripped. Having been in a critical phase of flight, I chose not to reset the breaker. We landed uneventfully on runway 20 in cha. I believe that the improper use of both the aircraft interphone system and the emergency and abnormal checklists led to priority handling for a non emergency event.

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Original NASA ASRS Text

Title: AN LR31 CAPT RPTED THAT HE DISAGREED WITH HIS FO'S DECLARATION OF AN EMER WITH ZTL AFTER A PRESSURIZATION ANOMALY WAS DETECTED.

Narrative: FLYING AT FL430, ENRTE TO DFW, THE CABIN WENT INTO EMER PRESSURIZATION. THE CABIN ALT WAS AT 6500 FT AND THEREFORE THERE WAS NO REASON FOR EMER PRESSURIZATION TO HAVE ACTIVATED. AN ATTEMPT WAS MADE TO TRY TO RESET THE R BLEED AIR, THEN BACK TO ON, AND THEN THE L BLEED AIR AND THEN BACK TO ON. THE SYS WOULD NOT RESET. WE ASKED ZTL FOR A LOWER ALT. CTR ASSIGNED FL330 AND WE STARTED OUR DSCNT. AT FL330, AND A CABIN ALT OF 4500 FT, WE MADE ANOTHER ATTEMPT TO RESET THE BLEED AIR WITH NO SUCCESS. DUE TO THE NOISE LEVEL THAT EMER PRESSURIZATION CAUSES, AND IMPROPER USE OF ACFT INTERPHONE SYS, THE FO MISUNDERSTOOD MY INTENTIONS OF WANTING A LOWER ALT AND VECTORS TO THE NEAREST SUITABLE ARPT AS NEEDING PRIORITY HANDLING, AND ENDED UP DECLARING AN EMER. CTR GAVE US VECTORS AND DSCNT FOR CHA, TN. UPON REACHING 5000 FT MSL, WE TRIED TO RESET THE PRESSURIZATION ONE MORE TIME. THE SYS STILL WOULD NOT RESET. I ASKED THE FO FOR THE COMPLETION OF THE 'BEFORE LNDG CHKLIST' AND AT THAT TIME HE FOUND THAT THE 'EMER BLEED' CIRCUIT BREAKER HAD TRIPPED. HAVING BEEN IN A CRITICAL PHASE OF FLT, I CHOSE NOT TO RESET THE BREAKER. WE LANDED UNEVENTFULLY ON RWY 20 IN CHA. I BELIEVE THAT THE IMPROPER USE OF BOTH THE ACFT INTERPHONE SYS AND THE EMER AND ABNORMAL CHKLISTS LED TO PRIORITY HANDLING FOR A NON EMER EVENT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.