(b)
Check for excessive vibration or unusual noise.
(c)
Check the APU annunciator lights are functioning normally.
(d)
APU operation must be monitored continuously.
The APU can be used for in-flight use when the requirements specified herein have been successfully accomplished.
APU Controls and Indicators 504
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RPM Indicator *[1] Indicates percent APU turbine speed, (expect certain actions at specific RPM).
1.
7% speed - fuel solenoid opens, igniter fires, EGT rises from ambient indication.
2.
50% speed - start relay R5 de-energizes, dc voltmeter indicates approximately 24-28 volts indicating starter dropped out.
3.
95% speed - APU bleed air valve ready to accept pneumatic load. The APU generator system is armed. Igniter is deactivated. The time totalizer meter is activated.
APU FIRE CONTROL HANDLE When pulled, arms the APU bottle discharge switch (on this panel only), closes the APU fuel shutoff, bleed air valves, and APU inlet door. Also, the generator control relay and generator breaker trip.
*[1] When RPM indicator and tachometer-generator assembly is installed.
APU Controls and Indicators Oct 20/83 Figure 101 (Sheet 6) 49-00 Page 106C/106D BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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** With APU running, turn APU bleed switch ON and check for opening of load control valve (monitor A/C manifold pressure). If LCV opens, check circuit from overtemp control switch to cockpit lamp. If LCV does not open, check for open circuit through 95% switch (normally open contacts) and overtemperature control switch.
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