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If the TRSOV is installed, a ‘PERFORMING TR SHUTOFF VALVE TEST’ screen is displayed, which times out after about 8 seconds. The next display asks 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.
The next display asks the operator to set the throttle lever to fwd idle and, when the doors are fully stowed, the test results screen is displayed.
If no faults were found, a ‘TEST OK’ message is
displayed and the operator is also given the opportunity of performing a restow test. This checks for possible restrictions in the hydraulic return lines from the HCU. To the operator, the test is identical to the previous test. There is no limit to the number of times the operator may perform the restow test.
 

EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION CFDS MESSAGE
INTERROGATION
FAULT DETECTION
& ANNUNCIATION Page 32
Nov 02
  
 
  CFM56-5B TRAINING MANUAL
 

 
CTC-231-081-00 THRUST REVERSER TEST
 
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION CFDS MESSAGE
INTERROGATION
FAULT DETECTION
& ANNUNCIATION Page 33
Nov 02
  
 
  CFM56-5B TRAINING MANUAL

 
CENTRALIZED FAULT DISPLAY SYSTEM (CFDS). ENGINE SYSTEMS - ECU.
FADEC test.
The FADEC test is divided into two parts. If starter air is available at the beginning of the test, a motoring test is performed. Otherwise, a non-motoring test is performed.
The non-motoring test will complete automatically in about two minutes. After the operator has pressed the line select key to start the test, a screen appears prompting the operator to place the mode selector switch to ‘NORM’ and the master lever to ‘ON’. When the conditions are met, a ‘TEST ACTIVE’ screen is displayed.
When the test is complete, a display reports that a non-motoring test was performed and prompts the operator to either press a key to display the test results, or return to the main menu.
If a fault is detected, the fault report page contains the identity of the 3 most likely failed LRU’s for the fault. A maximum of 3 faults per page are displayed with a maximum of 12 faults recorded.
If starter air is supplied, the engine is dry cranked and the various actuators and valves (except FMV, HPSOV and FRV valves) are commanded to move to certain
positions. The test will complete automatically in less than one minute.
As in the non-motoring test, after the operator has pressed the line select key to start the test, a screen appears prompting the operator to place the mode selector switch to ‘NORM’ and the master lever to ‘ON’. When the conditions are met, a ‘TEST ACTIVE’ screen is displayed.
　
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