AIRPLANE
OPERATIONS
MANUAL
PNEUMATICS
AIR CONDITIONING
AND PRESSURIZATION
REVISION 29
2-14-05
Page
2A
Code
01
In case of icing encounter during no bleed airflow demand, for
airplanes Pre-Mod SB 145-36-0028 EBV remains open and for
airplanes Post-Mod SB 145-36-0028 or equipped with an equivalent
modification factory incorporated, EBV is opened by the pneumatic
system's functional logic to allow engine bleed airflow to anti-ice
system.
A Cross-Bleed Valve (CBV), which is electrically commanded through
the Cross Bleed Knob and pneumatically actuated, provides the
segregation or interconnection between both sides in case of APU
operation or one engine pneumatic supply.
The pneumatic system’s functional logic opens or closes automatically
the CBV, if the Cross Bleed Knob is on AUTO position, during engine
start, depending on the available pneumatic source: APU, ground
pneumatic source or opposite engine.
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