May - Cessna

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In THISIssue:1New & IMPROVEDALTERNATE CABIN COOLING TIPS WITHOUTUSING MAX COOL (750)2-3SPRING CLEANING TIPS FOR EVAPORATOR ANDCOMPRESSOR SYSTEMS (500, 510, 525, 525A,525B, 525C, 550, S550, 560 and 560XL)6PRODUCT SPOTLIGHT: CONCORDE BATTERIESARE A TURN-ON (ALL MODELS EXCEPT 680)12iPAD APP FOR CLCalc WEIGHT AND BALANCENOW AVAILABLE (510, 525, 525A, 525B, 525C,550, S550, 560, 680 AND 750)4-51617In Every ISSUECUSTOMER SPOTLIGHTASK THE EXPERTEVENTS CALENDAR313LATEST REVISED EDITION OF CMM RECOMMENDEDFOR ENVIRO PARTS (500, 525, 525A, 525B, 550,S550, 560, 560XL AND 650)15SOVEREIGN COOLING TIPS FOR HOT WEATHERMONTHS (680)15Technical INFOAFT PEDESTAL EEC DOWNLOADS NO-GO ONENCORE+ (560)7DIRTY HEAT EXCHANGERS CAN CAUSE COOLINGACM HEADACHES (500, 550, S550, 560, 560XL,650, 680 and 750)7HONEYWELL ISSUES SB FOR IMPROVED OIL LUBEPUMP (650)8-11SYNOPSIS OF SERVICE BULLETINS AND SERVICELETTERS RELEASED (ALL MODELS)FULL WINDOW TINT NOT RECOMMENDED (ALLMODELS)THE DIRECT APPROACH IS PUBLISHEDMONTHLY BY THE CESSNA CITATION CUSTOMERSERVICE ORGANIZATION. COMMENTS ANDSUGGESTIONS ARE WELCOMED.PLEASE ADDRESS YOUR COMMENTS TO LOUIS BROWN316-517-3501 lhbrown@cessna.textron.com
750, ATA: 21-00Alternate Cabin Cooling Tipswithout Using MAX COOLThe hot summer months are approaching and the challenge of keeping aircrew and passengerscomfortable will soon be experienced by many Citation X operators. The intent of this article is to provideoperators alternate procedures to cool the cockpit/cabin without using the APU BLEED AIR MAX COOL switchsetting.The performance and service-life of Air Cycle Machines (ACMs) have been known topics of discussion atseveral technical product discussions in the past.With the recommended steps provided below, operators may find cooling with the CKPT PAC and CAB PACselector knobs on the HIGH settings may be sufficient enough to cool the cockpit/cabin sufficiently. This wouldeliminate the need of placing the BLEED AIR switch located on the APU control panel to the MAX COOL positionwith the added bonus of reducing demand of the cooling system components.1. Make sure all cabin window shades are closed if the airplane is parked outside and not in use.2. Make sure the baggage door is closed before starting the Auxiliary Power Unit (APU).3. Make sure all WEMAC air outlets are fully open in the cockpit overhead panel and the PassengerService Units (PSUs) in the cabin.4. Start the APU. Refer to the approved Airplane Flight Manual (AFM).5. Close the cabin door.6. On the environmental panel, move the ISOL VALVE to the OPEN position.NOTE: This valve setting will allow both Environmental Control Units (ECUs) to operate from one air sourcewith the APU operating.7. On the APU control panel, move the BLEED AIR switch to the ON position.NOTE: This switch setting will send approximately 13 PPM air flow to both ECUs.8. On the environmental panel, turn the CKPT TEMP SEL and CABIN TEMP SEL selector knobs tothe COLD position.9. Monitor the current temperature settings, if more cooling is desired do the following step:a. On the environmental panel, turn the CKPT PAC and CAB PAC selector knobs to the HIGHposition.NOTE: These selector knob settings will send approximately 16 PPM air flow to both ECUs.NOTE: White PAC HI CKPT and PAC HI CAB CAS messages will now be displayed.10. Before starting engines, do the following steps:a. On the APU control panel, make sure the BLEED AIR switch is in the ON position.b. On the environmental panel, move the ISOL VALVE to the CLSD position.c. On the environmental panel, turn the CKPT PAC and CAB PAC selector knobs to the ONposition.Questions, please contact:Team X316-517-5650 (Direct)1-888-622-4789 (WATS)citationx@cessna.textron.compage 1www.citationservice.com
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May - Cessna

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