SECTION 2
CESSNA
LIMITATIONS
MODEL 172RG
POWER PLANT INSTRUMENT MARKINGS
Power plant instrument markings and their color code significance
are shown in figure 2-3.
RED LINE
GREEN ARC
RED LINE
INSTRUMENT
MINIMUM
NORMAL
MAXIMUM
LIMIT
OPERATING
LIMIT
Tachometer:
S.L.
to 7500 Ft
- - -
2100 - 2500
2700 RPM
7500 ft. and above
(inner arc)
2100 - 2700
Manifold Pressure
- - -
(outer
arc)
15 -
25
- - -
Oil Temperature
- - -
in. Hg
100° - 245°F
245°F
Cylinder Head
- - -
200° - 500°F
500°F
Temperature
Fuel Pressure
0.5 psi
0.5 - 8.0 psi
8.0 psi
Oil Pressure
25 psi
60 - 90 psi
100 psi
Suction
4.5
5.4
Fuel Quantity
E
in. Hg
- _
(2 Gal. Unusable
Each Tank)
Figure 2-3. Power Plant Instrument Markings
WEIGHT LIMITS
Maximum Ramp Weight: 2658 lbs.
Maximum Takeoff Weight: 2650 lbs.
Maximum Landing Weight: 2650 lbs.
Maximum Weight in Baggage Compartment:
Baggage Area 1 - Station 82 to 108: 200 lbs. See note below.
2-6
1 July 1979
CESSNA
SECTION 2
MODEL 172RG
LIMITATIONS
Baggage Area 2 - Station 108 to 124: 50 lbs. See note below.
NOTE
The maximum combined weight capacity for baggage
areas 1 and 2 is 200 lbs.
CENTER OF GRAVITY LIMITS
Center of Gravity Range:
Forward: 36.0 inches aft of datum at 1950 lbs. or less, with straight line
variation to 39.5 inches aft of datum at 2650 lbs.
Aft: 46.5 inches aft of datum at all weights.
Moment Change Due To Retracting Landing Gear: +2424 lb.-ins.
Reference Datum: Front face of firewall.
MANEUVER LIMITS
This airplane is certificated in the normal category. The normal
category is applicable to aircraft intended for non-aerobatic operations.
These include any maneuvers incidental to normal flying, stalls (except
whip stalls), lazy eights, chandelles, and steep turns in which the angle of
bank is not more than 60°.
Aerobatic maneuvers, including spins, are not approved.
FLIGHT LOAD FACTOR LIMITS
Flight Load Factors:
*Flaps Up:
+3.8g, -1.52g
*Flaps Down: +2.0g
*The design load factors are 150% of the above, and in all cases, the
structure meets or exceeds design loads.
1 July 1979
2
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