Main Gear Manual Extension System Component Location 532
32-34-0 Figure 1 Jun 20/88
Page 2
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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. The motion of these components will cause the release spring (not on all airplanes) to stretch. Movement of the release rod will move an arm attached to a camshaft. Rotation of the camshaft causes a two-fingered cam to contact rollers on the uplock links. As the cam rotates the uplock links, the uplock links pull against two springs and the stop link to pull out board 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, and the release spring (if installed) attached to the crank assembly will return the main gear manual extension system to the original position when the manual extension handle is released.
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.
(4)
Release manual extension handle.
WARNING: DO NOT HOLD MANUAL EXTENSION HANDLE IN ANY EXTENDED POSITION DURING HYDRAULIC OPERATION OF THE LANDING GEAR.
532
Feb 20/93 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-34-0 Page 3
Main Gear Manual Extension Control 500
32-34-0 Page 4 Figure 2 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/93
532 Main Gear Manual Extension Control
Oct 20/83 Figure 2 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-34-0 Page 5
MAIN GEAR MANUAL EXTENSION SYSTEM - TROUBLE SHOOTING
EFFECTIVITY
AP N461GB, N462GB
LH D-ABEA thru D-ABED, D-ABEF thru D-ABEI,
D-ABEK thru D-ABEO PI N734N UA N9001U thru N9014U PEX N401PE thru N408PE
1. General
A. In trouble shooting the main gear manual extension system, the trouble symptoms are best identified by performing a test of manually extending the gear. (Ref 32-34-0, Main Gear Manual Extension System Adjustment/Test)
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 left and right main gear manual extension handles and one stationed near the gears to observe gear action. Main Gear manual extension system must be adjusted properly prior to trouble shooting. (Ref 32-34-0, Adjustment/Test)\
2. Prepare for Trouble Shooting
A. Jack airplane until all tires clear ground (Ref Chapter 7, Jacking).
B. Open manual extension access doors in control cabin floor and attach spring scale to manual extension handles of gear being tested.
C. Connect external electrical power supply.
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