SECTION 3
EMERGENCY
PROCEDURES
RECOVERY FROM SPIRAL DIVE IN
THE
CLOUDS
CESSNA
MODEL 172S
If a spiral is encountered in the clouds, proceed as follows:
1.
Retard throttle to idle position.
2.
Stop the turn by using coordinated aileron and rudder control
to align the symbolic airplane in the turn coordinator with the
horizon reference
line.
3.
Cautiously apply elevator back pressure to slowly reduce the
airspeed to 80
KIAS.
4. Adjust the elevator trim control to maintain
an
80 KIAS glide.
5.
Keep hands off the control wheel, using rudder control to hold
a straight heading.
6.
Clear engine occasionally, but avoid using enough power to
disturb the trimmed
glide.
7.
Upon breaking out of clouds, resume normal cruising flight.
INADVERTENT FLIGHT INTO ICING CONDITIONS
I Flight into icing conditions is prohibited and extremely
dangerous.
An
inadvertent encounter with these conditions can best
be
handled using the checklist procedures. The best procedure, of
course, is to turn back or change
altitude to escape icing conditions.
During these encounters, an
unexplained loss in engine speed
could be caused by ice blocking the air intake filter, or,
in
extremely
rare instances, ice completely blocking the fuel injection air
reference tubes.
In
either case, the throttle should be positioned to
obtain maximum
RPM (in some instances, the throttle may need to
be retarded for maximum power). The mixture
should then be
adjusted, as required, to obtain maximum
RPM.
STATIC SOURCE BLOCKED
If
erroneous readings of the static source instruments (airspeed,
altimeter and vertical speed) are suspected, the static pressure
lalternate source valve should be pulled ON, thereby supplying static
pressure to these instruments from the cabin.
3-18 Revision 4
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