Figure 5.16. Hot-Air Anti-icing System.
When engine speed increases above 65 percent, the inlet guide vanes begin to open. The
progression toward the open position is proportional to compressor speed. At 98 percent speed, the
vanes are opened to 7 off the centerline, and as speed increases to 100 percent, the vanes cross the
centerline to the -4.5 position. At any steady state N1 speed, between 65 percent and 98 percent, the
inlet guide vanes assume a constant position.
5.18.
INTERSTAGE AIR BLEED SYSTEM
An interstage air bleed actuator assembly and bleed band, illustrated in figure 4.27, are used
to facilitate compressor rotor acceleration and avoid compressor stalls. A series of vent ports around the
compressor housing, at the sixth stage of compression,
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