AIRPLANE
OPERATIONS
MANUAL
AUXILIARY
POWER UNIT
REVISION 37
2-09-05
Page
9
Code
01
AOM-145/1114
The APU is shut down by pressing the APU Stop Button or by setting
the Master switch to the OFF position. Normal shutdown of the APU
should be accomplished by pushing the STOP switch on the cockpit
APU control panel. On APU Model T-62T-40C11, a signal is sent to
the ESU in order to simulate an overspeed condition, which, aside
shutting the APU down, allows the ESU overspeed protection testing.
On APU Model T-62T-40C14, a stop request signal is sent to the
FADEC in order to execute the APU shutdown procedure; the FADEC
overspeed protection is tested during the FADEC power-up.
NOTE: The APU FUEL SHUTOFF BUTTON when pressed also shuts
the APU down by closing shutoff valve of the APU fuel feed-
line.
EICAS MESSAGES
TYPE MESSAGE MEANING
APU FAIL APU has been automatically
shut down.
APU OIL LO PRESS Oil pressure is below 6 psi.
CAUTION
APU OIL HI TEMP Oil temperature is above
166qC (331qF).
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