Cessna SkyHawk SP 172S NAV III 2005 Pilot Operating Handbook page 237

CESSNA
MODEL 172S NAV III
ENGINE
(Continued)
FUEL FLOW (Continued)
SECTION 7
AIRPLANE AND SYSTEMS DESCRIPTION
The fuel flow transducer is located in the engine fuel injection
system between the fueVair control unit (servo) and the fuel
distribution manifold (flow divider). The transducer provides a digital
signal to the GEA-71 for display on the EIS. A red
X
through the
indicator means the indicating system is inoperative.
OIL PRESSURE
Engine oil pressure is shown on the ENGINE page by the OIL
PRES horizontal indicator. The indicator range is 0 to 120 PSI with
a red arc from 0 to 20 PSI, a green arc from 50 to 90 PSI (normal
operating range) and a red arc from 115 to 120 PSI. A white pointer
indicates actual oil pressure. Oil pressure is shown numerically on
the SYSTEM page.
When oil pressure is 0 to 20 PSI or 115 to 120 PSI, the pointer,
digital value, and label (OIL PRES) will change to red to show that
oil pressure is outside normal limits. If oil pressure exceeds either
the upper or lower limit while on the LEAN or SYSTEM page, the
EIS will return to the ENGINE page.
When the engine speed (RPM) is in the green arc and the oil
temperature is in the green arc, the oil pressure should be in the
green arc. If oil pressure is below the green arc or above the green
arc, adjust the engine speed to maintain adequate oil pressure.
When engine speed is at idle or near idle, the oil pressure indication
must be above the lower red arc. With the engine at normal
operating oil temperature, and engine speed at or close to idle, oil
pressure below the green arc (but above the lower red arc) is
acceptable.
(Continued Next Page)
172SPHAUS-00
U.S. 7-31