MAIN GEAR UPLOCK MECHANISM - REMOVAL/INSTALLATION
1. General
A. Complete removal of main gear lock mechanism is extremely unlikely. The following instructions describe complete removal and installation of lock mechanism. When only part removal is required, follow directions under appropriate headings. The uplock hook and the link assembly must be removed before the uplock crank can be removed. The uplock crank must be installed before the hook and the link.
2. Prepare to Remove Main Gear Lock Mechanism
A. Check that landing gear ground lockpins are installed in all gear.
B. Depressurize hydraulic system A.
C. Open all landing gear circuit breakers on panel P-6.
D. Jack airplane until weight is supported on jacks (Ref Chapter 7, Jacking Airplane).
E. Remove uplock sensor and mounting bracket (Ref 32-61-21) from uplock hook. Tie sensor out of way
3. Removal/Installation Main Gear Lock Mechanism
A. Remove Uplock Hook
(1)
Remove lockwire, drive out spring pins (16, Fig. 401) securing uplock springs (14) to upper spring shaft (19).
(2)
Tap out shaft (19) from hook to release springs (14). Preserve spacers (18) that drop free when shaft comes out.
(3)
Remove bolt (21) securing hook (15) to stop link (20).
(4)
Remove hook to uplock crank attachment bolt (13) and remove hook (15) from airplane.
(5)
Remove nut from uplock support shaft (5).
(6)
Tap out shaft (5). Retrieve crank retaining collar (3) as shaft comes out.
NOTE: Position, number, and size of shims (6) installed under shaft head and between uplock crank (4) and uplock support fitting (8) should be tagged for use during assembly.
(7)
Remove uplock mechanism (4) from airplane.
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May 01/03 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-32-31 Page 401
B. Install Main Gear Uplock Mechanism (Fig. 401)
WARNING: USE NITRILE GLOVES FOR SKIN PROTECTION AGAINST BMS 3-27 (MASTINOX 6856K). IF MASTINOX GETS ON YOUR SKIN, IMMEDIATELY REMOVE IT WITH WATER. IF THIS MATERIAL GETS IN YOUR EYES, IMMEDIATELY FLUSH YOUR EYES WITH WATER AND GET MEDICAL AID. THIS MATERIAL CONTAINS VERY POISONOUS AND FLAMMABLE AGENTS WHICH CAN CAUSE INJURIES TO PERSONS.
CAUTION: UNWANTED MASTINOX MUST BE REMOVED FROM SURFACES WHICH WILL BE GREASED. APPLICATION OF MASTINOX TO JOINTS THAT TURN COULD CAUSE FAILURE OF THE LANDING GEAR TO EXTEND OR RETRACT.
NOTE: 1. Parts which are not lubricated after installation must be coated with Mastinox 6856K.
2. Parts which are lubricated after installation must be lubricated with Aero Shell 07.
(1)
Place uplock mechanism in position in reaction link (24).
(2)
Install attachment bolt (23) with head to antirotation lug on reaction link.
(3)
Add washer and nut.
(4)
Turn the nut on the bolt until the self-locking threads are fully engaged but the nut is not seated.
(5)
Measure the torque, and make sure that the torque is 90-800 pound-inches (This is the run-on torque).
(6)
Tighten the nut to the run-on torque plus 250-300 pound-inches.
(7)
Install uplock support shaft (5) through side strut support frame (7).
NOTE: Position, number, and size of shims should be installed as tagged on disassembly. If new shims are installed, assemble three thick (0.06-inch) shims
(6) between uplock crank (4) and side strut support frame (7). Shim with chamfer must be installed with chamfer against head of pin.
(8)
Pass shaft through uplock crank (4), place uplock crank retaining collar (3) on shaft, and insert narrow end of shaft (5) through support fitting (8).
(a) Align collar slot with bellcrank rib and engage rib into slot.
(9)
Install collar bolt (2) through crank retaining collar (3) and shaft (5). Insert bolt from side with counter bore.
(10)
Position shims on either side of side strut support frame (7) to center uplock hook on uplock roller within + 0.10 inch. Do a check on the clearance between the shims (6), and the support frame (7) on each side of the support frame (7). Add the clearance that you get on each side of the support frame (7).
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