AUXILIARY
POWER UNIT
AIRPLANE
OPERATIONS
MANUAL
2-09-05
Page
2
Code
01
REVISION 37
AOM-145/1114
In flight:
overspeed;
underspeed;
failure to start;
failure to accelerate;
failure to light;
loss of speed data;
external short;
loss of ESU (or FADEC) signal;
ESU (or FADEC) failure.
The APU compartment is located in the airplane’s tailcone, isolated by
a titanium firewall. On the left side of the APU compartment, an
inspection door allows access and inspection of the APU’s
components.
The APU starter-generator shaft drives an air-cooling fan. Air is drawn
through an NACA air inlet located on the left side of the tailcone. APU
draining is ducted to the airplane skin on the right side of the tailcone.
Control switches, alarms, and emergency shutdown means are
provided on the cockpit overhead panel.
The normal APU indications and caution/warning messages are
presented on the EICAS.
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