APU STARTING IN EXTREMELY COLD WEATHER - Continued
8. Check that APU GENerator switch (9) is OFF.
9. Turn FUEL SHUT OFF switch (10) ON. The LOW OIL PRESSure lamp (11)
will light until APU engine starts.
10. Turn PREHEAT switch (12) to MOMentary ON. Hold switch ON for 2 min
11. While holding PREHEAT switch ON, position and hold START switch (13) to
MOMentary ON. Hold both switches ON until APU starts or until 30 seconds
If APU engine doesnt start within 30 seconds, release START
switch (13), but continue to hold PREHEAT switch ON for an-
other minute. After allotted time, position START switch ON
again. If engine still does not start after another 30 seconds of
starting procedure, refer to procedure for starting APU when
outside temperature is -25° to -65° F (p 2-225).