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Cessna 172S Nav III User Manual

Cessna 172S Nav III
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SECTION 3
EMERGENCY
PROCEDURES
CESSNA
MODEL 172S NAV
III
IEMERGENCY OPERATION IN CLOUDS (Continued)
IEMERGENCY DESCENT THROUGH CLOUDS (AHRS FAILED)
When returning to VFR flight after a 180
0
turn
is
not practical, a
descent through the
clouds to VFR conditions below may be
appropriate.
If
possible, obtain
an
ATC clearance for
an
emergency
descent through the
clouds.
AHRS
Failure
Choose
an
easterly or westerly heading to minimize non-stabilized
magnetic compass card sensitivity.
Occasionally check the
compass heading
and
make minor corrections to hold
an
approximate course. The autopilot may
be
engaged
in
ROL mode
to keep the wings
level and VS mode to control rate-of-descent.
Before descending into the
clouds, prepare for a stabilized descent
as follows:
1.
Apply full rich mixture.
2.
Turn pitot heat
on.
3.
Set power for a 500 to 800 feet per minute rate-of-descent.
4.
Set the elevator trim for a stabilized descent at 80 KIAS.
5.
Use the standby attitude indicator roll pointer and index to
keep wings
level.
6.
Check trend
of
compass card movement and make cautious
corrections with rudder to stop the turn.
7.
Upon breaking out of clouds, resume normal cruising flight.
(Continued Next Page)
3-28
U.S.
172SPHAUS-03
,

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Cessna 172S Nav III Specifications

General IconGeneral
ManufacturerCessna
Model172S Nav III
EngineLycoming IO-360-L2A
Horsepower180 hp
Cruise Speed124 knots (143 mph, 230 km/h)
Service Ceiling13, 500 ft (4, 115 m)
Takeoff Distance (Ground Roll)960 ft (293 m)
Landing Distance (Ground Roll)575 ft (175 m)
Seating Capacity4
TypeSingle-engine, high-wing
Propeller2-blade, constant-speed
Fuel Capacity56 gallons
Wingspan36 ft 1 in
Length27 ft 2 in
Height8 ft 11 in
Stall Speed47 knots
Range640 nautical miles
Rate of Climb720 ft/min (3.7 m/s)
AvionicsGarmin G1000
Maximum Takeoff Weight2, 550 lbs (1, 157 kg)

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