777 AIRCRAFT MAINTENANCE MANUAL
BULK CARGO DOOR SYSTEM -DOOR AND SEAL
EFFECTIVITY BEJ ALL 52-36-00
Page 7
D633W101-BEJ May 05/2002
BULK CARGO DOOR SYSTEM -COUNTERBALANCE MECHANISM
Purpose
The counterbalance mechanism lifts the bulk cargo door to the open position.
Physical Description
The counterbalance mechanism has these components:
*
Tube that contains four springs
*
Saddle fitting
*
Piston rod
*
Bellcrank
*
Control rod.
Location
The tube has a pin in the middle that attaches to the saddle fitting. The saddle fitting attaches to airplane structure at the top of the bulk cargo compartment. The control rod attaches to the door.
Functional Description
The springs in the tube supply the force that opens the door. The piston rod, bellcrank, and control rod transmit the force that lifts the door.
Training Information Point
You can put a safety pin through the tube to keep the springs compressed when you disconnect linkage or remove the tube from the saddle fitting.
EFFECTIVITY BEJ ALL 52-36-00
Page 8
D633W101-BEJ Sep 05/2002
BULK CARGO DOOR SYSTEM -COUNTERBALANCE MECHANISM
EFFECTIVITY BEJ ALL 52-36-00
Page 9
D633W101-BEJ Jan 05/2002
BULK CARGO DOOR SYSTEM -SNUBBER
Purpose
The snubber controls the rate at which:
*
The counterbalance opens the door
*
You can close the door
*
The door closes if the counterbalance fails.
Physical Description
The snubber is a piston rod in a fluid-filled tube.
Location
The tube end of the snubber attaches to the airplane structure above the door cutout. The rod end attaches to the door.
Functional Description
Movement of the piston rod makes fluid flow through an orifice in the piston. This controls the rate at which the door moves.
EFFECTIVITY BEJ ALL 52-36-00
Page 10
D633W101-BEJ Sep 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
BULK CARGO DOOR SYSTEM -SNUBBER
EFFECTIVITY BEJ ALL 52-36-00
Page 11
D633W101-BEJ Jan 05/2002
BULK CARGO DOOR SYSTEM -HINGE ARM
Purpose
The two hinge arms connect the bulk cargo door to the airplane.
Location
One end of the hinge arm connects to the top of the door cutout. The other end connects to the door.
Functional Description
The hinge arms let the door open and close.
EFFECTIVITY BEJ ALL 52-36-00
Page 12
D633W101-BEJ Jan 05/2002
777 AIRCRAFT MAINTENANCE MANUAL
BULK CARGO DOOR SYSTEM -HINGE ARM
EFFECTIVITY BEJ ALL 52-36-00
Page 13
D633W101-BEJ Jan 05/2002
BULK CARGO DOOR SYSTEM -LATCH MECHANISM
Purpose
The latch mechanism lets you latch and unlatch the door.
Physical Description
The mechanism is made up of these components:
*
External handle
*
Latch probes
*
Springs
*
Push/pull rods
*
Internal handle.
Location
The latch mechanism goes across the door, near the bottom. The latches are on the door cutout.
Functional Description
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