Oil Temperature - Cessna 172S NAV III Pilot Operating Handbook

SECTION 7
AIRPLANE AND SYSTEMS DESCRIPTION
ENGINE
(Continued)
OIL PRESSURE (Continued)
CESSNA
MODEL 172S NAV III
In cold weather, the oil pressure will initially be high (close to the
upper red arc when the engine is started). As the engine and oil
warm up, the oil pressure will come down into the green arc.
The oil pressure transducer, connected to the engine forward oil
pressure port, provides a signal to the GEA-71 that is processed
and shown as oil temperature on the EIS. A separate low oil
pressure switch causes an "OIL PRESSURE" annunciation on the
PFD when oil pressure is 0 to 20 PSI. A red X through the oil
pressure indicator means that the indicating system is inoperative.
OIL TEMPERATURE
Engine oil temperature is displayed on the ENGINE page by the OIL
TEMP horizontal indicator. The indicator range is from 75°F to
250°F with a green arc (normal operating range) from lOO°F to
245°F and a red arc from 245°F to 250°F. A white pointer indicates
actual oil temperature. Oil temperature is displayed numerically on
the SYSTEM page.
When oil temperature is in the red band, 245°F to 250°F, the
pointer and OIL TEMP turn red and flash to show oil temperature is
higher than the limit. If oil temperature becomes hotter than 245°F
while on the LEAN or SYSTEM page, the display will default to the
ENGINE page.
The oil temperature sensor is installed in the engine oil filter adapter
and provides a signal to the GEA-71 that is processed and shown
as oil pressure on the EIS. A red X through the indicator shows that
the indicating system is inoperative.
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7-32 U.S.
172SPHAUS-00