Alpha Technologies APU Control Module (ACM) - Manual (Page 26)

018-340-B0-001 Rev. A 26
5.0 System Self-Test and Maintenance, continued
5.2 System Maintenance
The ACM monitors time between periodic maintenance of the engine-generator. The Service
Interval internal ACM variable represents the number of hours of engine-run-time between
periodic services. When the engine runs for a number of hours equal to Service Interval, the
ACM sets the Service Required Alarm and turns on the amber notifi cation LED. The default
value of Service Interval is 100 hours. Pressing and holding the service-reset switch for 5
seconds resets the service counter and Service Due is updated with the current value of the
service interval.
Oil change exact times will vary as a function of temperature and operating conditions.
NOTE: