OPERATING THE APU - Continued
8. Allow APU to warm up for three minutes, then turn APU Generator switch
When operating the APU at high altitudes and/or high
temperatures, continuous heavy-load demands by the
electrical and hydraulic systems may cause the APU
engine to overheat. In these extreme conditions, the
APU GENerator switch should be turned OFF and hy-
draulic components shut down periodically. Continue
to run APU without load for several minutes before
again operating generator and hydraulic components.
If HIGH AIR Temperature lamp (6) lights during opera-
tion, turn OFF the FUEL SHUT OFF switch. Allow APU
to cool before restarting. Notify Organizational Main-
tenance if lamp lights often.