May - Cessna

680, ATA: 21-50Sovereign Cooling Tips for HotWeather MonthsMany of our operators have told us that the Citation Sovereign cabin air does not cool enough during warmweather months. Team Sovereign has some tips that can help.Discretionary Service Bulletin 680-21-02-R1In 2010, Cessna released discretionary Service Bulletin 680-21-02-R1, “Bleed Air Flow Improvement affectingaircraft 680-0001 thru -0290. The modification of the environmental control system markedly increases theheating and cooling capacity for the cockpit/cabin. Team Sovereign highly recommends operators considerincorporating this bulletin on their airplane.Keep the Cabin DarkIf the airplane is parked on the ramp outside the cabin window shades should be closed. Reducing the amountof solar energy entering the cabin will reduce the interior temperatures before dispatch. Another item, called aShield, P/N CJMD310-002 can be purchased through CSP&P to install inside the cockpit windshields also.Operate the Auxiliary Power Unit (APU) with the Cabin Door ClosedWhen the APU is operated to cool the cockpit/cabin air, make sure the cabin door is closed. Operating the APUwith the MAX COOL switch in the ON position and the cabin door closed is the most efficient method to cool thecockpit/cabin air. However, it is also important to remember an operating APU in this configuration will slightlyincrease cabin pressure. Make sure the cabin pressure is equalized by opening a cockpit side window beforeopening the cabin door for a passenger/flight crew entry/exit.Questions, please contact:Team Sovereign316-517-1695 (Direct)1-877-683-7344 (WATS)team680@cessna.textron.comAll Models, ATA: 56-00Full Window Tint NotRecommendedCessna does not recommend the use of sun visor material (self-adhesion) to fully cover the windows inthe cabin or flight compartment. Cessna previously addressed a question about such material on windowsin the Ask the Expert section of the Sept. 2010 Direct Approach issue.The sun visor material can reflect the sun’s radiation back through windows in a manner similar to a solarmirror. The superheated window and surrounding interior structure can melt, creating a potential for fire.It should also be noted that any sun visor material installed on any of the flight compartment windows couldhinder optimum flight crew visibility for safe operations on the ground or in the air.Note: In the past, Cessna has issued optional service bulletins affecting the Citation II and S550 fleet, instructingoperators to install tinted window material on a small portion of the lower side windows of the cockpit sidewindow and foul weather windows. The tinted window material was added due to a landing light relocation.Questions, please contact:Customer Service Hot Line1-800-835-4090316-517-6261 (International)hotline@cessna.textron.compage 15www.citationservice.com