OPERATING THE APU
To avoid damaging radio components, turn off all radio switches before starting
For operation in extremely cold weather (-25°F to -65°F; 31.7°C to 53.9°C), see page 2-
Open APU front door and check APU engine oil level. Add oil to bring level to full (F) mark on dipstick. Add or
drain as necessary.
Turn off all electrical and radio switches.
Turn vehicle MASTER switch to ON.
The APU will not start if APU GENerator switch is set to ON.
Make sure APU GENerator switch (4) is set to OFF.
Turn FUEL SHUTOFF switch (1) to ON. The LOW OIL PRESSure lamp (3) will light until APU engine starts.
Turn PREHEATswitch (2) to MOMentary ON. Hold switch to ON for20 seconds if outside air temperature is above
55°F (12.8°C). Hold switch to ON for one minute if outside air temperature is between 0°F and 55°F (-17.8°C and
12.8°C). If air temperature is below 0°F, refer to page 2-215.