CESSNA
SECTION 2
MODEL 172S NAV III
OPERATING LIMITATIONS
POWERPLANT INSTRUMENT MARKINGS
Powerplant instrument markings and their color code significance
are shown in Figure 2-3. Operation with indications in the red range
is prohibited. Avoid operating with indicators in the yellow range.
POWERPLANT INSTRUMENT MARKINGS
* Maximum operating limit is lower end of red arc.
Figure 2-3
INSTRUMENT
RED
LINE
(MIN)
RED
ARC
(LWR)
YELLOW
ARC
GREEN ARC
(NORMAL
OPERATING
RANGE)
RED ARC
(UPR)
Tachometer
Sea Level
5000 Feet
10,000 Feet
----
----
----
RPM
2100 to 2500
2100 to 2600
2100 to 2700
RPM
2700* to 3000
Cylinder
Head
Temperature
----
----
----
200 to 500°F
----
Oil
Temperature
----
----
----
100 to 245°F
245* to
250°F
Oil Pressure
----
0 to 20
PSI
----
50 to 90 PSI
115* to 120
PSI
Fuel
Quantity
0 (1.5
Gallons
Unusable
Each
Tank)
----
0
to 5
Gallons
5 to 24 Gallons
----
Fuel Flow
----
----
----
0 to 12 GPH
----
Vacuum
Indicator
----
----
----
4.5 to 5.5
in.hg.
----
FAA APPROVED
172SPHAUS-03
U.S. 2-7