Page 103 - The Jet Engine
P. 103
Internal air system
Fig. 9-8 Control of axial bearing load.
upon a fixed diameter pressure balance seal to bled from the compressor. It is desirable to bleed the
ensure the location bearing is adequately loaded air as early as possible from the compressor to
throughout the engine thrust range. minimize the effect on engine performance.
However, during some phases of the flight cycle it
AIRCRAFT SERVICES
may be necessary to switch the bleed source to a
26. To provide cabin pressurization, airframe anti- later compressor stage to maintain adequate
icing and cabin heat, substantial quantities of air are pressure and temperature.
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