CTC-231-038-00 T/R FAILURE DETECTION
EFFECTIVITY
ALL CFM56-5B ENGINES FOR A319-A320-A321
CFMI PROPRIETARY INFORMATION FAULT DETECTION
FAULT DETECTION
& ANNUNCIATION Page 43
Nov 02
CFM56-5B TRAINING MANUAL
THRUST REVERSER
TRDV & TRPV solenoids.
The ECU interfaces with the TRDV solenoid, which The ECU also interfaces with the TRPV solenoid, which
contains 2 electrically isolated windings, one to channel contains 2 electrically isolated windings, one dedicated
A and the other to channel B. Each of the windings is to channel A and the other to channel B. The ECU
capable of operating the solenoid. performs current wrap tests on the circuitry of the TRDV
and TRPV solenoids to check continuity. This wrap
Each TRDV solenoid winding is connected to the ECU via test is continuously done, even if the solenoids are not
a two-wire cable, wired in series with an aircraft throttle commanded to be energized.
operated inhibition switch. The inhibition switch closes
only when the throttle is in the reverse region, supplying A fault message is generated if a failure is detected and
28 Vdc to the TRDV solenoid windings. the ECU will switch to the standby channel when the
faulted solenoid is commanded to energize, provided that
The ECU detects failures of the inhibition switch circuit, to the standby channel is healthier.
the closed state, if 28 Vdc is present when the throttle is
in the forward thrust region. In addition, the ECU detects pressurizing valve position
faults by comparing the position command to the
Typical fault message. system pressure indication given by the T/R pressurized
switches. A position fault is generated when the TRPV
J5, TR ACFT SW, ECU demand is for ‘pressure on’ and at least one of the two
pressure switches indicates ‘not pressurized’.
J6, TR ACFT SW, ECU
Typical fault message.
HCU (TRPV), J5, ECU HCU (TRDV), J6, ECU HCU (TRPV), HYD
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