C I R R U S
A I R P L A N E M A I N T E N A N C E M A N U A L
M O D E L S R 2 2
79-30
Page 1
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EFFECTIVITY:
INDICATING
1.
DESCRIPTION
This section describes that portion of the oil system which is used to indicate the quantity, temperature,
and pressure of the oil. Components included are the oil filler cap/dipstick, oil pressure/temperature gage,
oil pressure sensor, and oil temperature sensor.
An oil filler cap/dipstick is located at the rear of the engine on the top left side and is accessed through the
oil filler door on the upper cowling. The engine oil tank capacity is 8 quarts (7.57 L). Refer to Chapter 12,
Servicing for approved engine oil specifications and servicing procedures.
(Refer to 12-10)
Serials 0002 thru 1601, 1603 thru 1643, 1645 thru 1662:
A 2¼” combination Oil Pressure and Oil Temper-
ature Gage is mounted on the right instrument panel immediately below the EGT/CHT gage. The instru-
ment is internally lighted. The oil pressure pointer sweeps a scale marked from 0 psi to 100 psi. The oil
pressure gage receives a signal from a pressure sensor mounted at the aft end of the engine below the oil
cooler. Normally, oil pressure may drop to 10 psi at idle but will be in the 30 - 60 psi range at higher RPM.
The oil temperature pointer sweeps a scale marked from 75° F to 250° F in 25° F increments. The oil tem-
perature gage receives a signal from a temperature sensor mounted at the lower left side of the engine
below the oil cooler. 28 VDC for instrument operation is supplied through the 5-amp ENGINE INST circuit
breaker on the Essential Bus.
Serials 1602, 1644, 1663 & subs:
Oil pressure is displayed in the upper right corner of the MFD as both a
simulated pressure gage and as text. The simulated pressure gage receives a signal from a pressure sen-
sor mounted at the aft end of the engine below the oil cooler via the Data Acquisition Unit (DAU). The sim-
ulated pressure gage sweeps a scale marked from 0 psi to 100 psi in 5 psi increments. Oil pressure is also
continuously displayed in the engine parameters field located in the lower right corner of the PFD. In the
event oil pressure falls below 30 psi or exceeds 75 psi, the MFD will display “Check Oil Pressure” in a yel-
low advisory box in the lower right corner of the MFD. If oil pressure falls below 10 psi or exceeds 99 psi,
the MFD will display “Check Oil Press” in a red advisory box.
Oil temperature is displayed in the upper right corner of the MFD as both a simulated temperature gage
and as text. The simulated temperature gage receives a signal from a temperature sensor mounted at the
lower left side of the engine below the oil cooler via the Data Acquisition Unit (DAU). The simulated temper-
ature gage pointer sweeps a scale marked from 75° F to 250° F in 10° F increments. In the event oil tem-
perature reaches 235° F, the MFD will display “Monitor Oil Temperature” in a cyan advisory box in the lower
right corner of the MFD. If oil temperature exceeds 240° F, the MFD will display “Check Oil Temperature” in
a red advisory box in the lower right corner of the MFD. 28 VDC for the digital instrument operation is sup-
plied through the 2-amp ANNUN / ENGINE INST circuit breaker on the Essential Bus.
15 Apr 2007
