A B737-800 with the nitrogen gas generations system disabled; had a flight station temperature rise ...

Attributes
ACN	1106117
Time
Date	201307
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 16000
Person 2
Function	Pilot Not Flying First Officer
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Maintenance

Narrative:

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 'cabin attendant 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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site as of July 2013 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.

A B737-800 with the nitrogen gas generations system disabled; had a flight station temperature rise along with a cabin attendant cont alert; so the left pack was disconnected; an emergency was declared and the flight diverted for maintenance.