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MAIN GEAR MANUAL EXTENSION SYSTEM - ADJUSTMENT/TEST
1. Main Gear Manual Extension System Adjustment
A. General
(1) This procedure adjusts (rigs) either the left or right main gear manual extension system to obtain the cable tensions and clearances between components necessary for proper system operation.
B. Equipment and Material
(1)
Rigging Pin, 0.311 + 0.000/-0.002 inch diameter x 2.50 inch long, MS20392-4C
(2)
Gear Ground Lock Assembly - (Ref 32-00-01)
(3)
Corrosion Preventive Compound, MIL-C-16173, Grade 2 or MIL-C-11796, Class 3 (Ref 20-30-21)
C. Adjust Main Gear Manual Extension System
(1)
Check that gear ground lock assemblies are installed in all landing gear (Ref 32-00-01).
(2)
On airplanes with rig pin, align rig pinholes and install rigging pin through quadrant assembly and quadrant support (View 1, Fig. 501).
(3)
Remove cargo compartment ceiling panels at approximately body station 420 and remove turnbuckle-locking clip from cable MLGEA.
(4)
On airplanes without rig pin, adjust cable to obtain 0.05 + 0.10/-0.01 inch clearance between cam and uplock link rollers.
(5)
On airplanes with rig pin, adjust tension of cable MLGEA to match that of the springs so that rig pin is free.
NOTE: When performing step (5), check that release handle is properly seated in V-slot of manual extension control (Detail A).
(6)
On airplanes with rig pin, reduce rig load until quadrant stop clears rig pin by 0.05 inch maximum. Remove rig pin and check that quadrant crank contacts quadrant stop.
(7)
Install turnbuckle locking clips on cable MLGEA (Ref 20-10-81).
(8)
Remove shock strut inner door of main landing gear being adjusted to facilitate adjustment of uplock release rod (Ref 32-13-11 R/I).
(9)
Jack airplane until all tires clear ground (Ref Chapter 7).
(10)
Check that external electrical power supply is connected.
(11)
Pressurize hydraulic system A (Ref 29-11-0 MP).
(12)
Remove gear ground lock assembly from main landing gear being adjusted (Ref 32-00-01).
(13)
Check that all circuit breakers on landing gear circuit breaker panel (P6) are closed.
(14)
Place landing gear control lever in UP position to retract main gear being adjusted to up and locked position. Place control lever in OFF position.
(15)
On airplanes with rig pin, adjust uplock release rod at camshaft arm end to obtain 0.05 +0.10/-0.01 inch clearance between cam and uplock link rollers. Torque nut of bolt attaching rod end to camshaft arm 50 to 70 pound-inches (View 2).
NOTE: Check adjustable rod end of uplock release rod for proper thread engagement. End of rod end should cover at least 50% of inspection hole.
(16)
Apply a thin coat of corrosion preventive compound to exposed threads of adjustable rod end.
(17)
Remove rigging pin.
(18)
Test operation of main gear manual extension system per par. 2.
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D. Restore Airplane to Normal
(1)
Install gear ground lock assembly in main gear being adjusted (Ref 32-00-01).
(2)
Lower airplane and remove jacks (Ref Chapter7).
(3)
Install shock strut inner door (Ref 32-13-11 R/I).
(4)
On airplanes with quadrant guard, install quadrant guard.
(a)
Position guard over quadrant and install mounting bolts at strap beam (4 places).
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