If the APU fails to start within 15 seconds, release the switch from the START
position to prevent overheating of the starter motor. Allow the starter rotor to cool
1 to 2 minutes before trying again. If the APU fails to start after four tries, notify
Do not rotate START switch to the START position while the starter motor is still
turning from the previous try. This could result in serious damage to the starter
motor and engine flywheel ring gear.
After API has started, rotate START switch to OFF position or damage to
equipment may result.
(9) Turn START switch (12) clockwise to START position and hold for 15 seconds or until APU starts.
(a) Once APU starts, immediately rotate START switch (12) to OFF position.
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