Narrative:

Tower windows fog up at approximately xa:00 pm and then begin to defog at about xi:00 am the next morning. There will be problems if this situation is not taken care of. 10 of the 16 windows in the tower fogged tonight on my mid shift. I can not see the runways/txwys or the sky. Callback conversation with reporter revealed the following information: reporter stated that when maintenance is called, they use a window squeegee to remove the exterior window condensation. Exterior window condensation varies with atmospheric humidity and interior air conditioning climate control. Management requests that the internal tower cabin attendant temperature control remain in the mid 70 degree range. The reporter advises that the temperature is adjusted to countermand exterior heat and humidity. It has been recommended that a water spraying system be installed above each window that would be manually activated to clear condensation. Although this is a continual and constant problem for the controller's, no resolution has been forth coming. The reporter is concerned that aircraft and vehicle movement can not always be monitored to ensure a safe ATC operation.

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Original NASA ASRS Text

Title: SJU TWR CTLR CONCERNED WITH ARPT SCANNING CAPABILITY DUE TO VAPOR CONDENSATION ON EXTERNAL SURFACE OF TWR WINDOWS.

Narrative: TWR WINDOWS FOG UP AT APPROX XA:00 PM AND THEN BEGIN TO DEFOG AT ABOUT XI:00 AM THE NEXT MORNING. THERE WILL BE PROBS IF THIS SIT IS NOT TAKEN CARE OF. 10 OF THE 16 WINDOWS IN THE TWR FOGGED TONIGHT ON MY MID SHIFT. I CAN NOT SEE THE RWYS/TXWYS OR THE SKY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT WHEN MAINT IS CALLED, THEY USE A WINDOW SQUEEGEE TO REMOVE THE EXTERIOR WINDOW CONDENSATION. EXTERIOR WINDOW CONDENSATION VARIES WITH ATMOSPHERIC HUMIDITY AND INTERIOR AIR CONDITIONING CLIMATE CTL. MGMNT REQUESTS THAT THE INTERNAL TWR CAB TEMP CTL REMAIN IN THE MID 70 DEG RANGE. THE RPTR ADVISES THAT THE TEMP IS ADJUSTED TO COUNTERMAND EXTERIOR HEAT AND HUMIDITY. IT HAS BEEN RECOMMENDED THAT A WATER SPRAYING SYSTEM BE INSTALLED ABOVE EACH WINDOW THAT WOULD BE MANUALLY ACTIVATED TO CLR CONDENSATION. ALTHOUGH THIS IS A CONTINUAL AND CONSTANT PROB FOR THE CTLR'S, NO RESOLUTION HAS BEEN FORTH COMING. THE RPTR IS CONCERNED THAT ACFT AND VEHICLE MOVEMENT CAN NOT ALWAYS BE MONITORED TO ENSURE A SAFE ATC OP.

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.