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the ENGINE CONTROL light. An ENGINE CONTROL light comes
on when any two of these conditions are true for a T/R:
* The left translating sleeve position signal (from the LVDT) is
not in range
* The right translating sleeve position signal (from the LVDT)
is not in range
* The left translating sleeve position signals (from the LVDT)
do not agree
* The right translating sleeve position signals (from the LVDT)
do not agree.
Control Display Unit (CDU)
You can see LVDT real time data and failure messages on the
control display unit (CDU). See the engine indicating chapter for
more information about how the CDU helps you do troubleshooting.
(CHAPTER 77)
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REVERSER Lights
The amber REVERSER lights are on the engine panel. This
panel is on the P5 aft overhead panel in the flight compartment.
ENGINE CONTROL Lights
The amber ENGINE CONTROL lights are on the engine panel.
REV Messages
The REV messages show on the common display system
(CDS). The message shows just above the engine N1 indicator.
Control Display Units
The control display units (CDUs) are on the P9 panel in the flight
compartment. The CDUs are on the left and right side of the
lower center display unit.
THRUST REVERSER INDICATING SYSTEM - COMPONENT LOCATION - FLIGHT COMPARTMENT
EFFECTIVITY
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Purpose
The linear variable differential transformer (LVDT) supplies T/R
sleeve position data to the electronic engine control (EEC).
The EEC uses the LVDT signal for these functions:
* Control the REV message on the common display system
(CDS)
* Control the ENGINE CONTROL light (aft P5)
* LVDT failure isolation through the control display units
(CDUs).
* Reverse thrust interlock control
* Engine forward and reverse thrust control.
See the functional description in this section for more
information about the REV message.
See the engine controls chapter for more information about the
reverse thrust interlock. (CHAPTER 76)
See the engine controls chapter for more information about how
the EEC controls engine thrust. (CHAPTER 76)
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.
THRUST REVERSER INDICATING SYSTEM - LINEAR VARIABLE DIFFERENTIAL TRANSFORMER
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