When the T/R sleeves are in the forward (retracted) position, the fan air exhaust goes through the fan duct and comes out at the rear of the fan duct. This makes forward thrust.
When the T/R sleeves move to the aft (extended) position, the blocker door drag links move the blocker doors into the fan duct. This causes a blockage of the fan air exhaust in the fan duct. The fan air then flows through the cascade segments. The segments turn the fan air exhaust. They cause the fan air exhaust to come out the sides of the T/R in a forward direction. This makes reverse thrust.
Training Information Point
Each thrust reverser half weighs approximately 1180 pounds (535 kilograms) and requires special ground support equipment (GSE) for removal, installation, and ground transportation.

EFFECTIVITY BEJ ALL  78-31-00 
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D633W101-BEJ  Sep 05/2002 

THRUST REVERSER SYSTEM -GENERAL DESCRIPTION

EFFECTIVITY BEJ ALL  78-31-00 
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D633W101-BEJ  Sep 05/2002 

PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

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78-31-00

Page 8 D633W101-BEJ May 05/2003

THRUST REVERSER SYSTEM -COMPONENTS

General

The thrust reverser has two thrust reverser halves on each engine. The thrust reverser has these main components:
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Translating sleeve

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Fan duct cowl

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Aft cowl

The thrust reverser actuation system (TRAS) which includes the locking and nonlocking hydraulic actuators, the sync lock/ manual drive unit, the rotary variable differential transducer (RVDT), the isolation valve, sync lock valve, the directional control valve, and the electrical control and indication system are included in the SDS sections 78-34 and 78-36 that follow.
The thrust reverser sleeve has these components:

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Structure: outer wall, inner wall, acoustic panels, three actuator rod end attachment fittings and access panels

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Blocker doors

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Blocker door drag links

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Main and auxiliary track sliders

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Bullnose seal

The thrust reverser fan duct cowl has these components:

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Structure: Torque box, hinge and track beam, latch and track beam, inner wall, cascade aft attachment ring, hinge forward and track fairings

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V-band latch

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V-groove latch band

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V-band anchor strap

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Thrust reverser latch beam tension latches

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Cascade segments

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Bulb type fire seals

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Thermal insulation blankets

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Main and auxiliary track liners

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Latch access doors

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Pressure seals, miscellaneous seals, and bumpers
　
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