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using the adjacent RESET switch. The APU FAN FAIL indicator should
be checked prior to each start of the APU. If the indicator is activated,
fan operation is suspect and maintenance should be obtained as required
prior to running the APU. The APU may be operated at ambient
temperatures up to 38° C with an amber APU FAN FAIL indication.
The following CAS illuminations are specific to the APU:
CAS Color Description
APU FAIL Amber - A start inhibit signal has been detected by
the APU ECU.
or
- An APU protective shutdown signal has
been detected by the APU ECU.
or
- The APU aircraft fuel valve is not closed and
the APU is not running.
Pilot’s Manual
2-42 PM-126A
APU COCKPIT CONTROL PANEL
The APU cockpit control panel, located on the center pedestal, houses
the necessary controls for operation and monitoring. APU fire detection/
extinguishing controls are also located on the APU cockpit control
panel.
APU FAIL — The APU FAIL (amber) indicator shows a failure in the
APU control or indication system. The indicator will also show if the
aircraft fuel valve is not closed and the APU is not running.
APU MASTER — The APU MASTER switch/indicator is an alternateaction
push-button switch. When selected ON, the ECU is powered and
a bit test is started. If the test fails the APU FAIL indicator will come on.
APU FIRE — This switch/indicator is used to show an APU system fire
and activate the APU fire extinguishing system. Should there be a fire
in the APU, as detected by the fire loop, the FIRE switch/indicator will
indicate FIRE PUSH (red), the aircraft Master WARN lights will
illuminate, and the APU fire warning horn will sound. The fire
detection/extinguishing system will automatically shut down the APU
and activate the fire extinguisher within 10 seconds.
Depressing the FIRE switch/indicator will also shut down the APU
and discharge the APU fire extinguishing bottle. After shutdown, the
start inhibit circuit (within the ECU) is latched, not allowing restart.
The FIRE switch/indicator is wired directly to the R
EMER HOT BUS and will activate the APU fire extinguisher
even with the batteries OFF.
45_APU_CPIT_CTRL
APU COCKPIT CONTROL PANEL
Figure 2-9
NOTE
Pilot’s Manual
PM-126A 2-43
APU GEN AMPS — The GEN AMPS indicator is a digital display indicating
the amperage output of the APU Generator (shows zero during
start).
APU START/STOP — This switch/indicator is a momentary, two-cell,
lighted switch. The top portion is labeled START (white) and is on only
while the APU is starting. The lower portion is labeled RUN (green)
and is illuminated when the APU is running.
Depressing this switch initiates the APU start sequence. If the APU is
running, depressing this switch initiates the APU shutdown sequence.
APU MAINTENANCE PANEL
The APU maintenance panel is located in the tailcone equipment bay.
It houses the necessary controls, indicators and interfaces for operation
of the APU for maintenance, or to shut down the APU in an emergency.
APU FAIL/FAULT — The blue APU FAIL/FAULT indicator shows that
a fault has been registered by the ECU. The fault will be stored in the
ECU.
APU OIL ADD / LOW — The APU OIL indicators show whether the
APU oil level switch indicates an “ADD” or “LOW” (both amber) condition.
These indicators are operative only when the right aircraft battery
is on and the OIL TEST switch is held.
OIL TEST — The OIL TEST push button switch is used to check the oil
level in the APU. Pushing the switch, with the R BATT Switch on, allows
the “ADD” or “LOW” indicators to come on as required.
45_APU_MAINTPNL
APU MAINTENENCE PANEL
Pilot’s Manual
2-44 PM-126A
EMERG SHUTDOWN — This switch, when toggled, removes power
from the APU ECU and causes the APU to shut down. This function is
separate from the APU control panel in the cockpit. On the next ECU
power up, a loss of DC power fault is logged.
MAINT PORT— The RS 232 maintenance port provides the interface
between the APU ECU and the field service monitor. The PC and ECU
communicate through this port to provide maintenance personnel with
fault isolation information stored in the APU ECU.
APU FIRE WARNING SYSTEM
The APU fire detection system consists of a sealed gas line inside the
shroud surrounding the APU itself. In the event of a fire external to the
APU proper the increase in pressure in the sealed line activates the system:
- The APU FIRE PUSH and aircraft master WARN lights will
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