EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION CFDS MESSAGE
INTERROGATION
FAULT DETECTION
& ANNUNCIATION Page 29
Nov 02
CFM56-5B TRAINING MANUAL
CENTRALIZED FAULT DISPLAY SYSTEM (CFDS). ENGINE SYSTEMS - ECU.
Ignition test.
The ignition test consists of cycling ignitor A for 10 seconds, waiting 2 seconds, then cycling ignitor B for 10 seconds.
Selecting ‘IGN TEST’ from the main menu will display a screen with initial aircraft setup conditions. The operator is prompted to place the mode selector switch to the ‘NORM’ position and place the master lever to ‘ON’. The operator must then press the appropriate line select key to start the test.
While the test is active, a page is displayed warning the operator the ignitors are cycling and that pressing the ‘RETURN’ key will abort the test.
Upon completion of the test, a test ‘close up’ screen is displayed to ensure that the function is exited with the master lever returned to the ‘OFF’ position.
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
CENTRALIZED FAULT DISPLAY SYSTEM (CFDS). ENGINE SYSTEMS - ECU.
Thrust reverser test.
During this test, hydraulic pressure must be available for supply to the thrust reverser system. By moving the throttle in the reverse and forward regions, the T/R will deploy and stow under controlled conditions.
Thrust reverser position switch faults, pressurizing valve and directional valve solenoid electrical checks, aircraft inhibition switch failures and pressurizing valve position faults are announced, if detected.
Only thrust reverser system faults are announced during the test and the general FADEC test may be selected to determine if any other faults are present.
Selecting ‘T/R TEST’ from the main menu will display a screen with initial setup conditions and caution information. The operator must press the appropriate line select key to start the test.
Selecting ‘START TEST’ displays another screen with more caution information and setup conditions. The operator must confirm the start of the test by pressing the appropriate line select key.
If the TRSOV is not installed, a screen is displayed to ask the operator to set the throttle lever to max reverse and this screen is displayed until a timer times out, or the T/R is fully deployed.
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