AIRPLANE
OPERATIONS
MANUAL
POWERPLANT
REVISION 30
2-10-35
Page
1
Code
01
ENGINE INDICATING SYSTEM (EIS)
The EIS is composed of a wiring harness and a set of engine-mounted
sensors. This system is directly connected to the EICAS, providing real
time monitoring of the engine oil, fuel, and mechanical systems.
ENGINE SENSORS
PRESSURE/TEMPERATURE TRANSDUCER SENSOR
This sensor combines engine oil and temperature transducers in a
single housing, mounted on the Fuel-Cooled Oil Cooler (FCOC). The
pressure and temperature transducers are electrically independent and
require separate signal conditioning.
Due to the characteristic of some pressure sensors, the EICAS may
display approximately 90 psi for a 2 minutes period, for actual
pressures between 90.5 and 155 psi. Considering this characteristic,
pressure indication may jump suddenly from approximately 90 psi to
the actual pressure value, after the 2 minutes period is expired.
LOW OIL-PRESSURE SENSOR
The function of the low oil-pressure sensor is to give an indication
when oil pressure is low. This sensor is also mounted on the FCOC. A
warning message is presented on the EICAS in case of low oil
pressure.
OIL-LEVEL AND LOW-LEVEL SENSOR
The engine oil-level sensor is a transducer located in the oil tank that
gives continuous and accurate oil level readings from 3 quarts to
12 quarts. The low-level sensor is electrically open with 5 quarts or less
of oil remaining in the tank and remains closed otherwise. An indication
of oil-level is provided on the Takeoff page on the MFD. The indication
turns amber when oil level is at 5 quarts or below.
ELECTRICAL OIL-FILTER IMPENDING-BYPASS INDICATOR
The engine electrical oil-filter impending-bypass indicator is located in
the oil-filter assembly. An advisory message is presented on the
EICAS if the differential pressure across the oil filter exceeds its set
point.
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