APU STARTING IN EXTREMELY COLD WEATHER - ContinuedTM 9-2350-267-1014. Open side APU doorand open AFWplenum door (13)CAUTIONTo avoid damaging radiocomponents, turn off allelectrical andradioswitches before starting15.16.17,18.19.Turn all electrical andradio switches off(except MASTERswitch and personnelheater switches).Make sure APUGENerator switch(14) is OFF.Turn FUEL SHUT OFF switch (15) ON. The LOW OIL PRESSure lamp (16)will light until APU engine starts.Turn PREHEAT switch (17) to MOMentary ON. Hold switch ON for 2 min-utes.CAUTIONTO avoid excessive demand on batteries, do not crankengine longer than 1 minute at a time. Do not attemptto start APU for longer than 5 minutes total. if APUdoesn’t start in 5 minutes, notify Organizational Main-tenance.While holding PREHEAT switch (17) ON, position and hold START switch (18)to MOMentary ON. Hoid both switches ON until APU engine starts or until 30seconds have passed.NOTEIf APU engine does not start within 30 seconds, release STARTswitch (18), but continue to hold PREHEAT switch ON for an-other minute. After allotted time, turn START switch ON again.if engine still does not start, turn FUEL SHUTOFF switch OFFand allow APU to heat for an additional 15 to 30 minutes andrepeat steps 14 through 17. Troubleshoot APU if engine has notstarted after this action.2-227
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