CESSNA
SECTION 3
MODEL 172S NAV III
EMERGENCY PROCEDURES
EMERGENCY OPERATION IN CLOUDS
(Continued)
RECOVERY FROM SPIRAL DIVE IN THE CLOUDS (AHRS
FAILED)
AHRS Failure
If a spiral is entered while in the clouds, continue as follows:
1. Retard throttle to idle position.
2. Remove feet from rudder pedals.
3. Stop turn by carefully leveling the wings using aileron
control to align the roll index and roll pointer of the standby
attitude indicator.
4. Cautiously apply elevator back pressure to slowly reduce the
airspeed to 80 KIAS.
5. Adjust the elevator trim control to maintain an 80 KIAS glide.
6. Use aileron control to maintain wings level (keep roll pointer
and index aligned) and constant heading.
7. Resume EMERGENCY DESCENT THROUGH THE
CLOUDS procedure.
8. 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 be resolved
using the checklist procedures. The best action is to turn back or
change altitude to escape icing conditions. Set the PITOT HEAT
switch to the ON position until safely out of icing conditions.
During these encounters, an unexplained loss in engine power
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.
172SPHAUS-03
U.S. 3-29