B737-800
Flight Crew Air Transport Pilot (ATP)
Flight Crew Total 16000
Distraction; Physiological - Other; Troubleshooting; Workload
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Maintenance
Aircraft Equipment Problem Dissipated; Flight Crew Diverted; Flight Crew Landed in Emergency Condition; Flight Crew FLC complied w / Automation / Advisory; General Declared Emergency; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Company Policy; Procedure
After climbing through approximately 18;000 FT the cockpit started to get extremely warm. The First Officer checked the duct temperature and it was at 200 degrees. This was followed by a 'CAB CONT' light. The First Officer worked the QRH procedure without fixing the problem and the cockpit temperature became a problem. We leveled off at FL250 declared an emergency and coordinated with ATC to divert to a nearby airport. The temperature continued to rise in the cockpit. At this point due to previous write ups on the airplane and our nitrogen system degraded during preflight which the MEL says can be due to a pack overheat; I elected to have the First Officer go to the QRH and disconnect the left pack. This solved the overheat problem in the cockpit. We landed overweight and the airplane was taken out of service. Better coordination with Maintenance. The divert station maintenance crews said the airplane had a history and the degraded nitrogen system should have been a red flag; but was simply deferred.
The CONT ZONE temp light illuminated. The Captain was flying and I completed the QRH checklist for the CONT ZONE Temp. The QRH Zone Temp Checklist did not fix the problem. We leveled off at FL250. The temperature indicated 200 on the gauge for the CONT Duct supply.
A B737-800 with the Nitrogen Gas Generations System disabled; had a flight station temperature rise along with a CAB CONT alert; so the left pack was disconnected; an emergency was declared and the flight diverted for maintenance.