Cessna TURBO CENTURION T210M 1978 Pilot Operating Handbook page 162

SECTION 7
AIRPLANE
&
SYSTEMS DESCRIPTIONS
CESSNA
MODELT210M
maximum continuous manifold pressure of 35 inches Hg to well above
17,000 feet depending on engine and atmospheric conditions. However, . . ~
engine operating limitations establish the maximum manifold pressure
that may be used. Manifold pressure should be reduced above 17,000 feet, as
noted on the operating placard in the airplane (subtract 1 inch Hg from 35
inches for each 1000 feet above 17,000 feet).
At part throttle, the turbocharger is capable of maintaining cruise
climb power of 2500 RPM and 30 inches Hg from sea level to 20,000 feet in
standard temperatures, and from sea level to 8000 feet under hot day
conditions without changing the throttle position, once the power setting
is established after takeoff. Under hot day conditions, this climb power
setting is maintained above 8000 feet by advancing the throttle as neces-
sary to maintain 30 inches of manifold pressure in the same manner as a
normally aspirated engine during climb.
MANIFOLD PRESSURE VARIATION WITH AIRSPEED
When the waste gate is closed, manifold pressure will vary with
variations in airspeed. This is because the compressor side of the turbo-
charger operates at pressure ratios of up to 3 to 1 and any change in
pressure at the compressor inlet is magnified at the compressor outlet
with a resulting effect on the exhaust flow and turbine side of the turbo-
charger.
FUEL FLOW VARIATIONS WITH CHANGES IN MANIFOLD PRES-
SURE
The engine-driven fuel pump output is regulated by engine speed and
compressor discharge pressure. Engine fuel flm,v is regulated by fuel
pump output and the metering effects of the throttle and mixture control.
When the waste gate is open, fuel flow will vary directly with manifold
~
pressure, engine speed, mixture, or throttle control position. In this case,
manifold pressure is controlled by throttle position and the waste gate
controller, while fuel flow varies with throttle movement and manifold
pressure.
When the waste gate is closed and manifold pressure changes are due
to turbocharger output, as discussed previously, fuel flow will follow ,-.
manifold pressure even though the throttle position is unchanged. This
means that fuel flow adjustments required of the pilot are minimized to (1)
small initial adjustments on takeoff or climb-out for the proper rich climb
setting, (2) lean-out in cruise, and (3) return to full rich position for
approach and landing.
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