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electric panel, start the APU. Once the APU is running, bleed air is available for use on the
aircraft via the APU bleed pushbutton. The VALVE light comes on to indicate availability of
APU bleed air with the pushbutton off. Pressing the APU bleed pushbutton opens the APU
bleed valve.
Isolation Valves
Operation of the isolation valves is important to starting the aircraft and continued operation of
the pneumatic system on the ground and in flight. The following procedure assumes the APU is
running.
Set APU bleed valve open (pushbutton in). If you push the APU pushbutton with the APU off
the VALVE warning light will illuminate. At this point there is no DUCT PRESS (pressure).
This is because the C ISLN valve is closed (pushbutton open).
Press the C ISLN valve pushbutton in. The flow bar will illuminate. However, there still is no
DUCT PRESS because the L and R ISLN valves are still closed.
© Holger Ludwig, EuCom Airlines & Terry Yingling Seite 40 von 53
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Press the L ISLN valve pushbutton in and note that there is now pressure in the left duct as
shown by the DUCT PRESS gauge.
Press the R ISLN valve pushbutton in and note that there is now pressure in the right duct as
shown by the DUCT PRESS gauge.
Important to note is that without DUCT PRESS the engines will not start. So setting up the
isolation valves is important. Note that the aircraft can not fly around with the ISLN valves open
all the time. There is an important reason why not. After starting the engines and before takeoff
the L and R ISLN valves are normally closed (pushbutton out) for takeoff and flight. The most
important reason for this is to protect the operating engine in case of engine failure. The pilot
would not want the only operating engine to now have 2 times the bleed draw upon failure of the
opposite engine. This could cause even more trouble.
If desired, after the start of one engine the entire pneumatic system can be operated from that
engines bleed source. In this case the APU pushbutton would be pressed OFF (pushbutton out)
after engine start. The appropriate L ENG or R ENG pushbutton would be pushed in after which
the opposite side R ISLN or L ISLN pushbutton would be pushed in to complete the process.
Notice that the C ISLN valve remains open even with the APU bleed valve closed (pushbutton
out). In the actual aircraft there are some services that run off the C ISLN duct and require the
ISLN valve to be open during flight to get engine bleed air back to those areas.
Air Conditioning System
This is a non-operational system. It will affect the EICAS warning and some sounds. The
RECIRC fans generate a fan noise when ON.
L and R PACK switches are air conditioning switches. A PACK is an air cycle machine that
conditions the air for entry into the aircraft cabin. If the PACK is off then there is no air to the
cabin even though there might be air available as indicated by DUCT PRESS. There will be an
INOP warning since there is no air source available.
TRIM AIR is found on some aircraft and is another air source used by the air conditioning
system. It has an EICAS warning.
The RECIRC FANS generate EICAS messages when not operating or are switched off. The
recirc fans generate a fan noise when operating. The recirc fans will not operate on battery
power only.
© Holger Ludwig, EuCom Airlines & Terry Yingling Seite 41 von 53
http://www.eucomairlines.de
MISCELLANEOUS OVERHEAD SYSTEMS
Passenger Signs
The three positions are OFF, AUTO and ON. OFF is obvious. AUTO mode will turn the signs
ON and give a "ding". The AUTO mode is basically another ON mode. The ON mode is
obvious.
Anti-Ice
The engine and wing anti-icing switches serve no real purpose other than to simulate these
systems. They do have valve lights though. These lights will come on to indicate malfunctions
or valve transit. In our case they just simulate valve transit so momentarily flash any time you
select the switches on or off.
© Holger Ludwig, EuCom Airlines & Terry Yingling Seite 42 von 53
http://www.eucomairlines.de
Yaw Damper
The "L" yaw damper switch controls the operation of the yaw damper. The "R" yaw damper
switch controls the AUTO COORDINATION option of FS98. With the switch off (inop) the
auto coordination feature is turned off. With the switch on the auto coordination feature is
on. There is an appropriate EICAS message when these switches are turned off.
FORWARD OVERHEAD
This portion of the overhead contains mostly light switches and non-functioning switches.
Position/Interior Lights
Toggle expanded Overhead ON/OFF
Beacon
Strobes/Pitot Heat
　
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