COMAC ARJ21-700 - Waste System - Drain Other Liquid

ARJ21-SVV19-13120-00
RampServicingOperation
Instruction
WasteSystem-Drainotherliquid
1.CommonInformation
A.Thisprocedureprovidesthedrainwaterandushthewastetank.
B.Thedrainagepipecanbeproperlyextendedtoavoidcollisionbetweenthedrainwatertruckandthe
engine.Itisrecommendedthatthepipelengthextendedto7.5m.
2.PreliminaryRequirements
WorkZones
ZoneLocation
242AftServiceArea-Right
AccessPanels
NumberName
161ALWWasteServiceDoor
3.Procedures
A.Drainthewastetank
(1)Beforedrainwaterfortheaircraft,conrmtheaircraftinspectionwiththesitemaintenanceop-
erator,andstartdraining.
(2)OpenWasteServiceDoor161ALW.
(3)Thedrainwatertruckapproachthedrainpanel.
NOTE:
Keepthesafedistancebetweenthedrainwatertruckandtheengine.
(4)Connectthewastedrainhosefromthelavatoryservicevehicletothewastetankdrainballvalve
assemblyonthewasteservicepanel.
(5)Pushthedrainballvalveleverdownwardstoopenthewastetankdrainballvalve.
(6)Drainthewastetank.
NOTE:
Whilethetankdrains,feelthewastedrainhosetomakesurethattheliquidowsinto
thelavatoryservicevehicle.
B.Flushthewastetank
(1)Pushtherinsettinghandleonthewasteservicepanelupwardstoopentherinsetting.
(2)Connectarinsewaterhosefromthelavatoryservicevehicletotherinsettingonthewaste
servicepanel.
CAUTION:WHENFLUSHINGTHEWASTEWATERTANK,ITISNECESSARYTODRAINTHE
WASTEWATERATTHESAMETIME.OTHERWISE,THEWASTEWILLSOLIDIFY
ONTHEINNERWALLOFTHEWASTETANK,RESULTINGINREDUCTIONOFTHE
VOLUMEOFWASTETANKANDTHEFAULTOFULTRASONICLEVELSENSOR.
(3)Makesurethatthewaterpressuremeetstherequirements,andtheratedpressureis50psi
(345kPa).
ARJ21-A-13-12-24-01A-228A-A
Issue001,2023-01-29
Applicableto:ALL
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