THRUST REVERSER
TRPV position failures and TRSOV failures.
When energized, the TRSOV enables hydraulic pressure to be delivered for thrust reverser operation.
If the TRSOV is installed, TRPV closed position failures and TRSOV closed failures cannot be individually isolated. Consequently, failure detection strategies differ, based on whether the SOV is installed, or not.
The ECU detects TRPV position faults, along with TRSOV failures, by comparing the HCU pressure switches to the TRPV position command that is output by the T/R control logic.
If there is an information disagree, the TRPV position disagree faults will be annunciated for the failure combinations presented in the table.
Typical fault message. HCU, TRSOV, HYD HCU (TRPV OPEN) TR ISOL VALVE, HCU
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION
CFM56-5B TRAINING MANUAL
PHASE
(SOV NORMAL POS) TRPV CMD
= DEPLOY TRPV CMD
= PRESSURIZE PRESSURE SW
INDICATION FAILURE CONDITION MAINT MESSAGE
(ECAM WARNING)
DEPLOY
(SOV OPEN) TRUE TRUE BOTH NO PRESSURE TRPV COMMAND/POSITION
DISAGREE HCU, TRSOV, HYD
(ENG X REVERSER
FAULT)
END OF DEPLOY
T/R FULLY DEPLOYED
(SOV OPEN) TRUE FALSE BOTH PRESSURE TRPV COMMAND/POSITION
DISAGREE (FAILED OPEN) HCU (TRPV OPEN)
(ENG X REV
PRESSURIZED)
BEGINNING OF
STOW PHASE
(SOV OPEN) FALSE TRUE BOTH NO PRESSURE TRPV COMMAND/POSITION
DISAGREE HCU, TRSOV, HYD
(ENG X REVERSER
FAULT)
AFTER ENGINE START
DURING TRSOV TEST
(SOV CLOSED) FALSE TRUE EITHER PRESSURE
OR BOTH PRESSURE SOV FAILED OPEN TR ISOL VALVE, HCU
(ENG X REV ISOL
FAULT)
CTC-231-043-00 TRSOV FAILURES
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 53
Nov 02
CFM56-5B TRAINING MANUAL
CHANNEL SELECTION Fault processing.
Each channel integrates several fault conditions into a channel-health 32-bit word.
This word can be considered as a ‘health report’, listing the faults for a particular channel. In this way, each channel is able to keep the other constantly informed of its current status.
In the ECU, the fault processing software (logic) for channel selection uses the existing fault conditions to create fault statuses that will then make up the channel health words.
For example, channel selection fault statuses may include:
- Loop faults for FMV, VSV and VBV.
- Loss of cross channel data, on the active channel. - NVM fault, on the active channel.
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