(2)
Make sure the landing gear ground lock assemblies are installed in the nose and main landing gear (Ref 32-00-01).
WARNING: MAKE SURE GROUND LOCK ASSEMBLIES ARE INSTALLED IN ALL LANDING GEAR TO PREVENT INADVERTENT OPERATION OF THE GEAR. INJURY TO PERSONNEL AND/OR DAMAGE TO EQUIPMENT COULD RESULT IF THE GEAR RETRACTS.
(3)
Make sure the hoses are correctly routed through the hose guides and are not twisted.
(4)
Connect a variable volume test bench to the airplane and pressurize hydraulic system A to 3000 psi.
(5)
Using the manual override, move the landing gear selector handle from DOWN to UP several times. When you move the landing gear selector handle, leave the handle in each position at least three seconds before you move it to the next position.
(6)
Move the landing gear selector handle to DOWN.
(7)
Watch the rod end of the nose landing gear retract actuator while moving the landing gear selector handle to OFF. Make sure the rod end attempts to extend when the selector handle is moved from DOWN to OFF.
(8)
Move the landing gear selector handle to DOWN.
(9)
Check the hydraulic connections for leaks.
(10)
Add hydraulic fluid to the reservoir as necessary (Ref Chapter 12, Hydraulic Servicing).
(11)
Restore the airplane to normal.
500
Jun 20/91 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-33-11 Page 405
NOSE GEAR LOCK ACTUATOR - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Ground Lock Assemblies (Ref 32-00-01)
B. Grease - MIL-G-21164 or MIL-G-23827 optional to BMS 3-33
C. Corrosion Preventative Compound - MIL-C-11796, Class 3
2. Prepare to Remove Nose Gear Lock Actuator
A. Check that landing gear ground lock assemblies are installed (Ref 32-00-01).
B. Depressurize hydraulic system A (Ref 29-11-0, Maintenance Practices).
C. Jack nose of airplane until all weight is off nose gear. Use aft body jack at point C as necessary (Ref Chapter 7, Airplane Jacking).
3. Remove Nose Gear Lock Actuator
A. Disconnect hydraulic lines (7, Fig. 401) from lock actuator (6). Plug lines.
B. Disconnect bottom end of actuator from bracket (3) on bulkhead.
C. Remove nuts and washers from lock brace shaft (2).
D. Disconnect aft ends of lock springs (1) from shaft (2).
E. Remove retainer bolt (10) from lock brace (9) and shaft.
F. Tap out shaft (2) and raise lock brace (9) enough to give access to actuator upper attachment bolt (11).
G. Remove upper attachment bolt and remove lock actuator from airplane.
H. Remove hydraulic fittings from actuator and discard O-ring packings. Plug ports.
4. Prepare to Install Nose Gear Lock Actuator
A. Remove plugs and install hydraulic fittings in actuator with new O-ring packings.
B. Extend actuator rod 1-3/16 inches from full retraction.
C. Fill actuator with hydraulic fluid and cap ports.
Sep 01/02 32-33-21 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
5. Install Nose Gear Lock Actuator
A. Clean and lightly lubricate all bolts and washers (except retainer bolt (10, Fig. 401)) with grease, just before installing.
B. Place actuator in position for installation with rod end up and hydraulic ports forward.
C. Install a countersunk washer on upper attachment bolt (11) with countersink toward bolt head.
D. Align rod end of actuator with fork in lock brace (9).
E. Insert bolt (11) from left side of airplane with nylon washers (8) on each side of rod end between rod end and lock brace fork.
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