MD-11 Flight Crew Operations Manual
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APU -
Description and Operation
APU.10.4
The APU cannot be started without battery power. During a battery start, DOOR,
FUEL, and FAIL lights, if illuminated indicate malfunctions. During the start
sequence, both the AVAIL light on the APU PWR switch and the ON light on the
APU START/STOP switch flash.
An APU oil quantity drop is normal during the start sequence.
After APU start, with AC power available, the APU ON alert is displayed on the
EAD and N1, EGT, N2, and OIL parameters are displayed on the SD.
The APU door closes when the APU master switch is actuated to STOP. At this
time, the APU indication is removed from the SD, and the APU ON alert
disappears.
A 90-second time delay provides a cushion against thermal shock to the turbine
section. The APU continues to run after it has been commanded OFF if air has
been used.
APU shutdown will be inhibited if the APU START/STOP switch is selected to
STOP while the APU AIR switch remains selected ON.
The APU symbol is removed from the AIR synoptic when APU air is no longer
available.
October 02, 2006
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