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Physical Description
The LVDT is a dual channel transducer with separate
armatures. The LVDT has two electrical connectors for EEC
channel A and channel B wiring. The locking hydraulic actuator
feedback control rod connects to the LVDT’s armature
assembly.
Location
The LVDT is on the head end of the locking actuator. You open
the fan cowl to get access to the head of the locking actuator.
Functional Description
The feedback rod of the locking actuators moves the LVDT’s
armature assembly as the T/R sleeve deploys or stows.
The EEC supplies excitation to the LVDT. The LVDT’s output
voltage is proportional to its armature position. The LVDT’s
output is proportional to the sleeve position.
Troubleshooting
You use the control display unit (CDU) to help do
troubleshooting of the LVDT. Refer to the troubleshooting
page of this section for more information.
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General
A REVERSER light comes on when any of these conditions
happen:
* For 10.5 seconds after T/R stow command
* T/R stow control system component fault (except during a
deploy operation)
* T/R deploy control system component fault during deploy
operation.
The engine accessory unit (EAU) contains the logic necessary
to identify T/R control system component faults. The EAU
controls the REVERSER lights.
Stow Operation
The reverser lights usually comes on for 10.5 seconds after you
command a stow operation. This is because the hydraulic
isolation valves (HIV) temporarily stay in the arm position to
supply hydraulic power to the actuators for the stow operation.
This condition usually ends 10.5 seconds after the stow
command.
See the thrust reverser control system section for more
information. (SECTION 78-34)
Stow Fault Logic
The EAU identifies any of these conditions as a stow fault:
* Any sleeve stow sensor is near (10s after stow command)
* Any sleeve lock sensor is near (10s after stow command)
* Left or right sync lock voltage (26s after stow command)
* Directional control valve (DCV) sensor near (15s after stow
command)
* HIV sensor near (15s after stow command).
For any of these conditions the REVERSER light comes on. The
light goes out when the stow fault goes away. The master
caution and the ENG annunciator come on if the fault stays for
more than 13 seconds.
The REVERSER light will come on and stay on (latch) if the EAU
sees the arm switch fail to the deploy position. This is the only
stow fault that keeps the REVERSER light on. You must replace
the switch, deploy the T/R and reset the EAU to make the
REVERSER light go out.
Deploy Fault Logic
The EAU identifies any of these conditions as a deploy fault:
* Any sleeve stow sensor far (6s after deploy command)
* Any sleeve lock sensor far (6s after deploy command)
* No left or right sync lock voltage (2s after deploy command)
* Directional control valve (DCV) sensor far (6s after deploy
command)
* HIV sensor far (6s after deploy command).
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For any of these conditions the REVERSER light comes on. The
master caution and the ENG annunciator comes on if the fault
stays for more than 13 seconds.
A deploy fault keeps the reverser light on. You must fix the
　
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