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Engine Oil Quantity Transmitter
The engine oil quantity transmitters send an analog signal to
both display electronic units (DEUs).
The DEUs send an 8v dc reference voltage to the transmitters
and the oil quantity output signal is proportional to the oil
quantity level. The transmitter uses a floating magnet and reed
switches.
Engine Module
The engine module sends two ground discretes to both DEUs.
These discretes show the position of the EEC ON/ALTN switch.
This data is sent to the EECs.
When an EEC detects an engine control fault, the DEUs send
two ground discretes to the engine module. This turns on the
engine control annunciator for that particular engine.
CDS - ENGINE INTERFACES - 3
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N1 and N2 Speed Sensor
The engine speed sensors send analog frequency signals to
both display electronic units (DEUs). N1 is low pressure rotor
speed and N2 is high pressure rotor speed.
Usually, the DEUs use the N1 and N2 data from the engine
electronic controls (EECs) for display on the center display units
(DUs). When the EECs do not have power, the DEUs use the
analog inputs from the engine speed sensors.
The DEUs also send N1 and N2 data to other airplane systems
on the general purpose bus and the engine EEC buses.
Airborne Vibration Monitor
The airborne vibration signal conditioner sends vibration data
for engine 1 and 2 to the DEUs on an ARINC 429 bus. This data
shows in scalar units on the center DUs.
CDS - ENGINE INTERFACES - 4
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Engine Ignition Selector
The engine ignition switch sends two ground discretes to the
display electronic units (DEUs). These discretes show the
position of the engine ignition switch (L IGN, BOTH, or R IGN).
The DEUs send this data to the engine electronic controls (EEC)
on the EEC/APU buses.
Engine Start Valve
The engine start valves send a ground discrete to the DEUs
when the valve is in the open position. The DEUs use this data
for the START VALVE OPEN indication on the center display
units (DUs). This data also goes to the EECs on the EEC/APU
buses.
CDS - ENGINE INTERFACES - 5
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Engine Alternate Power Relay
The display electronic units (DEUs) send ground discretes to the
engine alternate power relays. The relays supply electrical
power from the transfer buses to the engine electronic controls
(EECc).
The DEUs send the engine alternate power discretes when one
of these is true:
* Engine start lever is set to idle
* Engine start switch is set to GRD
* Engine start switch is set to CONT
* Control display unit (CDU) set to engine BITE.
Engine Running Relay
The DEUs send the ground discretes to the engine running
relays. These relays supply engine running status to other
airplane systems.
The DEUs send the engine running discretes when one of these
is true:
* EEC digital discrete is set to run
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