A CRJ900 cockpit display cooling fan was installed backward causing the 'display temperature' EICAS ...

Attributes
ACN	961186
Time
Date	201107
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet 900 (CRJ900)
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning Distribution System
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Commercial
Experience	Flight Crew Last 90 Days 23 Flight Crew Total 3100 Flight Crew Type 600
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Maintenance

Narrative:

Approximately 10 to 15 minutes after reaching cruise altitude (FL320); we received 'display temperature' on co-pilot's pfd. The captain ran the non normal checklist. A few minutes into the checklist we began to have 'display temperature' on all of the other screens except the EICAS 1 display. We declared an emergency and chose a nearby airport as the diversion airport due to VFR conditions on the field. Weather at that airport began to deteriorate and we elected to divert to a slightly more distant airport where the weather was VFR normal landing; no other complications. I received word from the mechanics that cleared our discrepancy that one of the fans that cools draws cool air flow over the displays were placed in back wards. The event was due to a mechanical failure which cannot be eliminated. Our checklist does not allow for switching to the flight altitude fan; which we have a switch on the lower pedestal for.

Original NASA ASRS Text

Title: A CRJ900 cockpit display cooling fan was installed backward causing the 'DISPLAY TEMP' EICAS alert on all but one PFD so an emergency was declared and flight diverted to a nearby VMC airport.

Narrative: Approximately 10 to 15 minutes after reaching cruise altitude (FL320); we received 'DISPLAY TEMP' on Co-pilot's PFD. The Captain ran the Non Normal Checklist. A few minutes into the checklist we began to have 'DISPLAY TEMP' on all of the other screens except the EICAS 1 display. We declared an emergency and chose a nearby airport as the diversion airport due to VFR conditions on the field. Weather at that airport began to deteriorate and we elected to divert to a slightly more distant airport where the weather was VFR normal landing; no other complications. I received word from the mechanics that cleared our discrepancy that one of the fans that cools draws cool air flow over the displays were placed in back wards. The event was due to a mechanical failure which cannot be eliminated. Our checklist does not allow for switching to the FLT ALT Fan; which we have a switch on the lower pedestal for.

Data retrieved from NASA's ASRS site as of April 2012 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 CRJ900 cockpit display cooling fan was installed backward causing the 'display temperature' EICAS alert on all but one pfd so an emergency was declared and flight diverted to a nearby VMC airport.