(2)
Reduce rig load until cable tension matches that of spring tension and rig pin is free.
NOTE: When performing step C, check that release handle is properly seated in V-slot of manual extension control.
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Nose Gear Manual Extension System 500
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500 Nose Gear Manual Extension System
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D. Install turnbuckle locking clips on cable MNGEA (Ref Chapter 20, Cable Turnbuckle Locking Clip).
E. Install cabin floor panel.
F. Remove rigging pin.
4. Test Nose Gear Manual Extension System
A. Test Manual Extension System (Airplane on Jacks)
(1)
Jack airplane until nose gear tires clear ground (Ref Chapter 7, Jacking).
(2)
Connect external electrical power supply.
(3)
Pressurize hydraulic system A (Ref 29-11-0 MP).
(4)
Remove gear ground lock assembly from nose gear (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 EQUIPMENT COULD RESULT IF GEAR RETRACTS.
(5)
Check that nose gear is centered.
(6)
Use override trigger and place landing gear control lever in UP position to retract nose gear to up and locked position. Place control lever in OFF position. Maintain hydraulic system A pressure at 3000 psi.
CAUTION: CHECK THAT LANDING GEAR CONTROL LEVER IS PLACED IN OFF POSITION WHEN OPERATING MANUAL EXTENSION SYSTEM. IF MANUAL EXTENSION HANDLE IS HELD IN ANY EXTENDED POSITION AND CONTROL LEVER IS MOVED TO UP POSITION, SYSTEM CABLE FEEDBACK WILL CAUSE MANUAL EXTENSION HANDLE TO SNAP BACK FORCIBLY INTO V-SLOT.
DO NOT TURN STEERING WHEEL WITH NOSE GEAR SHOCK STRUT FULLY EXTENDED TO PREVENT POSSIBLE DAMAGE TO SHOCK STRUT CENTERING CAMS.
(7)
Open manual extension access door and attach spring scale to nose gear manual extension handle.
(8)
Pull upward and forward on manual extension handle with spring scale for full travel of approximately 8 inches.
(a)
Check that force required to release nose gear from up and locked position does not exceed 70 pounds.
(b)
Check that nose gear free falls to down and locked position as evidenced by green indicator light on pilots' landing gear panel or that red marks on nose gear lock strut visual indicator align within + 0.03 inch.
(9)
Place control lever in UP position to retract nose gear to up and locked position. Place control lever in OFF position.
(10)
Depressurize hydraulic system A.
(11)
Repeat step (8). Results should be same.
(12)
Restore airplane to normal.
(a)
Install gear ground lock assembly (Ref 32-00-01).
(b)
Close manual extension access door.
(c)
Determine if there is further need for hydraulic and electrical power on airplane, if not, shut down sources.
(d)
Lower airplane and remove jacks (Ref Chapter 7, Jacking Airplane).
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B. Test Manual Extension System (Airplane on Gear)
(1)
Check ground lock assemblies are installed (Ref 32-00-01).
(2)
With all gear down and locked, place landing gear control lever in OFF position.
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