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CDS -- ENGINE INTERFACES - 1
-Control mode switch position -Internal EEC fault status.
-Minimum idle
-Idle selected The DEUs use this data for the engine display function
-N1 speed data and the BITE/monitoring function via the CDUs.
-N2 speed data
-Overspeed governor status
-Engine starter cutout
-Exhaust gas temperature (EGT) data
-Fuel flow data
-Fuel filter status
-Oil pressure data
-Oil temperature data
-Oil filter status
-Thrust resolver angle (TRA) data
-Thrust reverser status
-Engine thrust
-Engine sensor data
-EEC software version
-Engine serial number
-Engine actuator positions
-Combustor fuel air ratio
-EEC channel in control
-Start lever position
-Airplane on ground selection status
-Engine thrust rating and airplane model
compatibility
-Airplane model
-Engine rating
-Engine options
-EEC alternator status
-Engine position
-Engine bleed load
-Air data status from ADIRUs
- 322 -
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CDS - ENGINE INTERFACES - 1
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737-600/700/800/900 TRAINING MANUAL CDS -- ENGINE INTERFACES - 2 Engine Start Switch
The engine start switches send two ground discretes to the display electronic units (DEUs). One discrete gives a signal that the engine start switch is in the flight position. The other discrete gives a signal that the engine start switch is in the ground or continuous position.
The DEUs also send a ground discrete to the engine start switches when N2 is less than 55%. This holdup discrete energizes the engine start switch solenoid to hold the switch in the GRD position. When engine N2 is more than 55%, the ground is removed and the start switch returns to the OFF position.
Engine Start Lever Relay
The engine start lever relays send ground discretes to the DEUs to indicate the engine start lever position (idle or cutoff).
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ENGINE 2
DEU 2
START SWITCH
CDS - ENGINE INTERFACES - 2
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CDS -- ENGINE INTERFACES - 3 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.
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737-600/700/800/900 TRAINING MANUAL CDS -- ENGINE INTERFACES - 4 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.
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2
N1 SPEED SENSOR (ENG 1) AVM BUS
2 AIRBORNE VIBRATION SIGNAL CONDITIONER
N1 SPEED SENSOR (ENG 2) DEU 1
2
N2 SPEED SENSOR (ENG 1)
2
N2 SPEED SENSOR (ENG 2) CDS - ENGINE INTERFACES - 4 DEU 2 31-62-00
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