Cessna 172R, Operating Handbook

Page: 88 / 500

SECTION
3
EMERGENCY PROCEDURES
CESSNA
MODEL 172R
RECOVERY FROM SPIRAL
DIVE
IN
THE
CLOUDS
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
|
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 7