TM 9-2350-267-10OPERATING THE APU - Continued8. Allow APU to warm up for three minutes, then turn APU Generator switch(1) ON.CAUTIONWhen operating the APU at high altitudes and/or hightemperatures, continuous heavy-load demands by theelectrical and hydraulic systems may cause the APUengine to overheat. In these extreme conditions, theAPU GENerator switch should be turned OFF and hy-draulic components shut down periodically. Continueto run APU without load for several minutes beforeagain operating generator and hydraulic components.CAUTIONIf HIGH AIR Temperature lamp (6) lights during opera-tion, turn OFF the FUEL SHUT OFF switch. Allow APUto cool before restarting. Notify Organizational Main-tenance if lamp lights often.2-118
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