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 2.  Main Gear Manual Extension Control Cable________________________________________
 A.  The main gear manual extension control cables are connected to the manual extension control drums installed beneath the control cabin floor and routed beneath the cabin floor through pulleys and eyeball type pressure seals to the main gear uplock release mechanism in the respective main gear wheel well (Fig. 2). When the manual extension handle is pulled to release the gear, the motion is transmitted by the control cables through the uplock release mechanism to the main gear uplock assembly. Motion supplied to the uplock assembly from the manual extension system releases the uplock hook from the uplock roller on the main gear to allow the main gear to fall to down and locked position.
 3.  Main Gear Manual Extension Linkage__________________________________
 A.  The main gear manual extension linkage is located in the main gear wheel well adjacent to the main gear uplock assembly (Fig. 1). Motion to release the main gear is transmitted by a cable MLGEA to a quadrant assembly. As the quadrant moves, it will push a crank which will move the release rod which is attached to the quadrant assembly crank. Movement of the release rod will move an arm attached to a cam shaft. Rotation of the cam shaft causes a two-fingered cam to contact rollers on the uplock links. As the cam rotates the uplock links, the uplock links pull against the return spring and the stop link to pull outboard on the uplock hook. As the uplock hook moves outboard, the main gear uplock roller is released and the main gear will free fall to the down and locked position. Further control cable movement is prevented when the uplock link rollers bottom out on the cam. The return spring attached to the quadrant assembly will return the main gear manual extension system to the original position when the manual extension handle is released.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
CONTROL 
CABLES 
MLGEA 
LEFT MAIN GEAR 
MANUAL EXTENSION 
LINKAGE 
MANUAL 
EXTENSION 
CONTROL 
WHEEL 
WELL 

MLGEA CABLE 
MANUAL EXTENSION HANDLES R MANUAL EXTENSION ACCESS DOOR N L  RETURN SPRING 
FORWARD STRUCTURE  CABLE GUARD 
QUADRANT ASSEMBLY 
UPLOCK RELEASE ROD 
MLGEA CABLES  CAM  CAM SHAFT ARM AFT STRUCTURE 
CONTROL DRUMS 

Main Gear Manual Extension System Component Location
Figure 1

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A 737-300/400/500MAINTENANCE MANUAL
 4.  Operation
_________
 A.  The main gear manual extension system is operated from the control cabin. Each gear is operated individually. To manually extend a main gear, proceed as follows:
 (1)  
Place landing gear control lever in neutral or down position.

 (2)  
Open manual extension control access door.

 (3)  
Pull respective main gear manual extension handle approximately 14.4 to 16.1 inches and observe that main gear falls to down and locked position as indicated by the corresponding green light on the pilots' instrument panel.

 CAUTION: DO NOT HOLD MANUAL EXTENSION HANDLE IN ANY EXTENDED POSITION
_______ DURING HYDRAULIC OPERATION OF THE LANDING GEAR.
 (4)  Release manual extension handle.
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A 737-300/400/500MAINTENANCE MANUAL

Main Gear Manual Extension Control
Figure 2 (Sheet 1)

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