2-35
MANAGEMENT OF ANCILLARY CONTROLS
Cowl Flap Control
55.
Cowl flaps are used to modulate the flow of cooling air through the engine compartment
in flight. Opening the cowl flaps creates a low pressure area which effectively pulls air through
the engine for increased cylinder and oil cooling. Air flowing through the engine creates a
significant amount of drag which is minimized by closing the flaps when enhanced cooling
airflow is not required. Cowl flaps are used as follows:
a.
Aircraft Parked
– OPEN – to keep birds from nesting in the cowling;
b.
Start and Ground Operations
– OPEN – to ensure even airflow distribution
through engine compartment;
c.
Takeoff and Climb
– OPEN – to ensure maximum cooling airflow;
d.
Cruise
– cowl flaps will normally be CLOSED to maintain appropriate CHTs and
to minimize cooling drag. Cruise with cowl flaps open can reduce IAS by 3-5
MPH. Intermediate settings may be required at high density altitudes and / or high
power settings to prevent engine overheating; and
e.
Descent and Landing
– CLOSED – to minimize shock cooling of engine. When
conducting continuous circuits, the cowl flaps may be left OPEN.
Mixture Control
56.
To prevent fouled plugs, rough running and/or engine damage, correct leaning
procedures must be followed during all phases of flight. Proceed as follows:
a.
Ground Handling
- full rich unless operating at high density altitudes or extended
ground idling is anticipated, in which case the mixture should be leaned
aggressively. Return to full rich prior to run-up or takeoff;
b.
Takeoff
- mixture normally set to full rich unless taking off at high density altitude
(> 3000’ MSL). For high altitude takeoffs, hold brakes, apply full power, then lean
as necessary for smooth running / maximum power;
c.
Climb
- lean progressively in climbs above 3000 ft MSL. Adjust mixture as
required to maintain takeoff EGT readings (approx 1100-1300ºF);
d.
Cruise
- after altitude, airspeed and power settings have stabilized, lean to 50ºF
Rich of Peak in accordance with the “LeanFind” procedure in EDM-930 manual;
and
e.
Descent, Circuit
- mixture normally set to full rich.
Содержание 182
Страница 2: ......
Страница 57: ...1 39 Figure 1 47 Electrical Schematic ...
Страница 76: ...1 58 This page intentionally left blank ...
Страница 124: ...2 48 This page intentionally left blank ...
Страница 140: ...3 16 This page intentionally left blank ...