Cruise; Descent; Landing - Continental Motors TSIO-520-BE Maintenance And Operator's Manual

6-12 CRUISE
1 Set manifold pressure and RPM for cruise power selected.
2. After engine temperatures have stabilized at cruise condition (usually within 5 minutes). adjust mixture
to lean cruise condition according to Chapter 13 of this manual.
NOTE , .. During high ambient temperature, a very low fluctuation in fuel flow may appear in the early flight
stages, which is caused by excess vapor. If this occurs, operate the fuel boost pump as recommended by
the aircraft manufacturer.
3. When a lean mixture setting is used, for cruise, and increased power is desired, the mixture control must
be returned to the richer setting before changing the throttle or propeller setting. When reducing power,
retard throttle, then adjust RPM and mixture.
4. If it is necessary to retard the throttles at altitudes above 10,000 ft., leaning of the fuel mixture may also
be necessary to maintain satisfactory engine operation. The mixture must be returned to the richer setting
before the throttle is returned to the high power positions.
NOTE ... Rapid throttle movements may cause undershooting or overshooting the desired manifold
pressure and a subsequent adjustment will be required after the turbochargers have stabilized. Gradual
throttle movement will permit the turbochargers to keep pace with the change in power. On pressurized
aircraft, slower manifold pressure adjustment will prevent sudden "spikes" in cabin altitude. At high altitude,
large reductions in manifold pressure may cause some reduction of cabin pressure.
6-13 DESCENT
Descent from high altitude is to be accomplished at cruise power settings and mixture control positioned
accordingly.
CAUTION ... Rapid descents at high RPM and idle manifold pressure setting are to be avoided.
During Descent. monitor cylinder and oil temperature and maintain above the minimum specified limits.
NOTE ... Avoid long descents at low manifold pressure as the engine can cool excessively and may not
accelerate satisfactorily when power is reapplied. lf power must be reduced for long periods, adjust propeller
to minimum governing RPM and set manifold pressure no lower than necessary to obtain desired
performance. If the outside air is extremely cold, it may
be
desirable to add drag to the aircraft in order to
maintain engine power without gaining excess airspeed. Do not permit cylinder temperature to drop below
240"F.
6-14 LANDING
1. In anticipation of a go around and need for high power settings, the mixture control should be set in
"FULL RICH" or "BEST POWER" position, depending on field elevation, before landing.
NOTE ... Advance mixture slowly toward "FULL RICH". If engine roughness occurs, as may happen at very
low throttle settings and high RPM, it may be desirable to leave the mixture control in a leaner than full rich
position until the throttles are advanced above 15 inches of manifold pressure.
2. Operate the boost pump as instructed by aircraft manufacturer.
6-7