Nose Gear Manual Extension System Component Location  500 
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

3.  Nose Gear Manual Extension Release Mechanism
A.  The nose gear manual extension release mechanism is located in the aft ceiling area of the nose gear wheel well (Fig. 2). Motion to release the nose gear is transmitted by a cable to a torque tube. A roller is attached eccentrically to the torque tube. As the torque tube rotates, the roller contacts an extension of the nose gear lock link. As the roller is forced against the lock link extension, a force is applied to move the lock strut from the overcenter (locked) position and the nose gear will free fall to the down and locked position. A stop attached to the torque tube contacts structure to prevent further control cable movement after the torque tube has been rotated approximately 100°. A return spring attached to the quadrant assembly and to the structure will return the system to its original position when the handle is released.
4.  Operation
A.  The nose gear manual extension system is operated from the control cabin. To manually extend the nose gear, proceed as follows:
(1)  
Place landing gear control lever in neutral or down position.

(2)  
Open manual extension control access door.

(3)  
Pull nose gear manual extension handle approximately 8 inches and observe that nose gear falls to down and locked position as indicated by the green light on the pilots' instrument panel.

(4)  
Release manual extension handle.

WARNING:  DO NOT HOLD MANUAL EXTENSION HANDLE IN ANY EXTENDED POSITION DURING HYDRAULIC OPERATION OF THE LANDING GEAR.
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Nose Gear Manual Extension Control  500 
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500  Nose Gear Manual Extension Control 
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NOSE GEAR MANUAL EXTENSION SYSTEM - TROUBLE SHOOTING
1. General
A.  In trouble shooting the nose gear manual extension system, the trouble symptoms are best identified by performing a test of manually extending the gear (Ref 32-35-0 A/T).
B.  The system is functionally tested with hydraulic system A depressurized and landing gear control lever in the off position.
C.  Two men are required, one stationed in the control cabin to operate the nose gear manual extension handle and one stationed near the gears to observe gear action.
D.  Nose gear manual extension system must be adjusted properly prior to trouble shooting (Ref 32-35-0 A/T).
2.  Prepare for Trouble Shooting
A.  Jack airplane until nose gear tires clear ground (Ref Chapter 7, Jacking).
B.  Open manual extension access doors in control cabin floor and attach spring scale to nose gear manual extension handle.
C.  Connect external electrical power supply.
D.  Pressurize hydraulic system A (Ref 29-11-0 MP).
E.  Remove nose gear ground lock assemblies (Ref 32-00-01).
WARNING:  CHECK THAT GROUND LOCK ASSEMBLIES ARE INSTALLED IN MAIN LANDING GEAR TO PREVENT INADVERTENT OPERATION OF GEAR. INJURY TO PERSONNEL AND/OR DAMAGE TO EQUIPMENT COULD RESULT IF GEAR RETRACTS.
F.  Check that nose gear is centered.
G.  Use override trigger and place landing gear control lever in UP position to retract nose gear, then move control lever to OFF position.
WARNING:  PERSONNEL KEEP CLEAR OF GEAR PATHS TO PRECLUDE POSSIBLE INJURY TO PERSONNEL.
CAUTION:  DO NOT TURN STEERING WHEEL WITH NOSE GEAR SHOCK STRUT FULLY EXTENDED TO PREVENT POSSIBLE DAMAGE TO SHOCK STRUT CENTERING CAMS.
H.  Depressurize hydraulic system A (Ref 29-11-0 MP) and proceed trouble shooting with pressure off.
I.  Following trouble shooting, restore airplane to normal.
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NOSE GEAR MANUAL EXTENSION SYSTEM - ADJUSTMENT/TEST
1.  General
　
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