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The startermotoris deactivated at50% rpm andtheSTARTlegendgoesout. When theAPUreaches99% rpm, ignition is turnedoffandtwo secondslatertheAVAIL legend,in the START/STOP switchlight,illuminates to notifythe crew thatthe APUis readyto supply electricalpower andbleedair. (1) APUStarterLimits SOURCE START # and TIME ON COOLING TIME 1 30 seconds No cooling required BatteryBattery 2 30 seconds 20 minutes 3 30 seconds No cooling required 4 30 seconds 40 minutes 1 15 seconds No cooling required x erna owerE xt ernal D C P ower 2 15 seconds 20 minutes 3 15 seconds No cooling required 4 15 seconds 40 minutes Flight Crew Operating Manual MASTER
Itisrecommendedthata2minutedelaybeobserved betweenstartattemptstoallowforcoolingoftheAPU start contactorandforfueldrainage. During normal operations, a nuisance XFLOW/APU PUMPcautionmessagemaycomeon. Whenthisoccurs, selecting the APU PWR/FUEL switchlight to on then off will usually clear the message. If the message clears, there is no operational restrictions and the anomaly shouldbe disregarded. Ifoverspeed orovertemperature occurs duringflight, donot restarttheAPU.
Flight Crew Operating Manual MASTER
Control REV 56, Jan 31/03 PWR FUEL Switch/Light PUMPFAILlight comes on to indicate that
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