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The one-way restrictors restrict the mass flow rate of hydraulic
fluid to the T/R hydraulic actuators. They permit free hydraulic
flow from the T/R hydraulic actuators. This prevents a possible
hydraulic pressure build up across the head of the actuators
when the T/Rs are not in operation.
Internal Valve Position Sensors
The EAU uses the position sensors on the DCV and The HIV for
fault detection. See the EAU page in this section for more
information.
Training Information Point
There is no hydraulic return to the standby system for T/R 1.
There is a transfer of hydraulic fluid from the standby system to
system A during stow if the standby system deploys the T/R.
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There is no similar transfer of hydraulic fluid for T/R 2 operation.
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General
The EAU face has a set of lights and switches for each T/R. A
placard near the bottom the EAU supplies BITE instructions.
T/R Control System Troubleshooting
The EAU BITE helps you do trouble-shooting of the T/R control
system. The EAU monitors these component inputs from each
T/R:
* Left and right sleeve stow proximity sensors
* Left and right sleeve lock proximity sensors
* Hydraulic isolation valve (HIV) position (inside the T/R
control valve module)
* Directional control valve (DCV) position (inside the T/R
control valve module)
* Voltage at both sync locks.
The EAU identifies a fault if an input is incorrect for the thrust
reverser command. For example, a sync lock may not receive
electrical power after the pilot commands a deploy operation.
The T/R DEPLOY FAULTS light comes on if a fault happens
during a deploy operation. The T/R STOW FAULTS light comes
on if a fault happens during a stow operation or after a stow
operation. Both lights are red.
The EAU also has a light for each component input. If a
component has a failure, then its light will stay on at the end of
the BITE. These lights are red.
This is a brief summary of the BITE procedure:
* You push and hold the T/R DEPLOY FAULTS button (switch)
to see deploy faults or
* Push and hold the T/R STOW FAULTS button (switch) to see
stow faults
* All lights come on for a test
* Lights which stay on show faults
* The green NO FAULTS DETECTED light comes on if there
are no faults found
* You release the button (switch)
* Lights that stayed on to show faults go out.
You use the FAULT RESET buttons (switches) to erase the EAU
fault memory. Deploy faults are reset only when the T/R is in the
deploy position. Refer to the procedures in chapter 78, part two
of the airplane maintenance manual (AMM) when you use the
EAU BITE.
The fault memory will erase when the T/R operates 5 times with
no faults.
The EAU FAULT light comes on if there is an internal EAU
failure.
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