There are six drag links. The drag links are made of corrosion resistant steel (CRES).
The drag links are attached to anchor fittings in the fan duct inner wall and the spring loaded link in the blocker door.
Functional Description
When the thrust reverser sleeve is in the forward (retracted) position, the blocker doors make part of the fan duct outer wall.
When the thrust reverser sleeve is in the aft (extended) position, the blocker door drag links move the blocker doors into the fan duct.
Training Information Point
Ground support equipment (GSE) stackable platform blocks are used to get access to the blocker door hinges and drag link connection from inside the fan duct. Make sure the blocks are clean of contamination that could damage the composite surface of the sleeve.
You must extend and go into the thrust reverser to examine, remove, or install the blocker doors and blocker door drag links. Also, you must open the thrust reverser to examine, remove, or install the blocker door drag links at the fan duct inner wall.
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THRUST REVERSER SYSTEM -BLOCKER DOORS AND BLOCKER DOOR DRAG LINKS

Do not go into the thrust reverser fan duct when the thrust reverser is open. Your weight can cause the failure of the hold open rod.
Make sure the soles of your work boots are clean of unwanted material. Use boot socks over your work boots or use a protective mat to protect the composite surface of the sleeve.
Do not pull or stand on the drag links.

WARNING: DO THE DEACTIVATION PROCEDURE TO PREVENT THE OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONNEL AND DAMAGE TO EQUIPMENT
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THRUST REVERSER SYSTEM -BLOCKER DOORS AND BLOCKER DOOR DRAG LINKS

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PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

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Page 34 D633W101-BEJ May 05/2003

THRUST REVERSER SYSTEM -CASCADE SEGMENTS

Purpose

The cascade segments control the direction of the fan air exhaust (reverse thrust) when the thrust reverser sleeves are in the aft (extended) position and the blocker doors are in the fan duct. Also, the cascade segments give structural strength to the thrust reverser.
Location

The cascade segments attach to the torque box and the cascade segment attach ring. When the thrust reverser sleeve is retracted, the cascade segments fit in the space between the inner and outer sleeve. When the thrust reverser sleeve is extended, the cascade segments are exposed to the fan air exhaust flow turned by the blocker doors.
　
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