OPERATING THE APU (continued)
When operating the APU at high altitudes and/or high temperatures,
continuous heavy-load demands by the electrical and hydraulic systems may
cause APU engine to overheat. In these extreme conditions, the APU
GENerator switch should be turned to OFF and hydraulic components should
be shut down periodically. Continue to run APU without load for several
minutes before again operating generator and hydraulic components.
If HIGH AIR TEMPerature lamp lights during operation, turn FUEL SHUTOFF
switch to OFF. Allow APU to cool before restarting. Notify Unit maintenance if
lamp lights often.
8. Allow APU to warm up for three minutes, then turn APU GENerator switch (4) to ON.