APU High Air Temperature System
APU high air temperature system malfunctioning.
APU high air temperature lamp does not light when air temperature is high. Do steps 1 thru 13.
Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry contacts a metal surface a direct
short may result in instant heating of tools, damage to equipment, and injury or death to personnel.
Remove lamp from socket. Place red lead of multimeter in socket and black lead to ground. Turn
MASTER and APU FUEL SHUTOFF switches ON, and check for voltage. Turn MASTER and APU
FUEL SHUTOFF switches OFF. If voltage is present, replace lamp (see WP 0438 00). If voltage is not
present, go to step 2.