(n)
Extend the jack foot screw until the jack foot firmly touches the ramp surface.
(o)
Use the adjustable hand pump to put a load on the stanchion if it is necessary.
NOTE: After you connect the stanchion to the airplane, you can
____ put a load on the stanchion as much as approximately 22,500 pounds <10,200 kilograms). Use the adjustable hand pump to do this. The usual recommended load of the stanchion is between 5,000 - 10,000 pounds (2,000 -4,500 kilograms).
The relief valve in the hydraulic circuit relieves at
25,000 pounds (10,200 kilograms) | 10%.
E. Remove the Support Stanchion (Fig. 201).
S 092-006
(1) Remove the support stanchion.
(a)
Turn the valve on stanchion base counterclockwise.
(b)
Permit the stanchion to move down until the weight is on the headstock jaws.
NOTE: The load gage should show zero pressure.
____
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A
747-400 MAINTENANCE MANUAL
(c)
Turn the valve to the full clockwise position.
(d)
Move the valve on the headstock circuit board to the open position.
(e)
Use the headstock pump to open the jaws to the full open position.
(f)
Turn the valve on the stanchion base counterclockwise.
(g)
Permit the jack ram to move down approximately 40 inches (1 meter) then close the valve.
(h)
Lift the jack foot and move the stanchion away from the airplane.
TASK 07-11-08-492-007
3. Tail Support Jack at Jack Point III - Installation
__________________________________________________
A. Standard Tools and Equipment
(1) Fuselage jack
B. Access
(1) Location Zone
314 Stabilizer Torsion Box Compartment, RH (Aft Jack Point) Station 2596, Right Buttock Line 30
C. Prepare to Support the Tail at Jack Point III (Fig. 202).
S 492-008
(1) Put the jack in the correct position.
(a)
Put the jack directly below the jack pad.
(b)
Put the caster wheels in an aligned position.
NOTE: With the caster wheels aligned, they can follow one
____ another when the jack turns clockwise (counterclockwise, where applicable).
CAUTION: DO NOT PERMIT THE JACKSCREW TO EXTEND MORE THAN THE
_______ APPROVED EXTENSION ON THE PLACARD. IF YOU EXTEND THE JACKSCREW TOO FAR, YOU CAN CAUSE DAMAGE TO THE JACK AND THE AIRPLANE.
(c) Turn the inner screw to keep a 3 inch clearance between the jack and the jack pad before you apply pressure to the jack.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
AIRPLANE RM852 REQUIRES ú 07-11-08
65B16363-1M-556087F STANCHION SUPPORT ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
0.75 (1.9) SPHERICAL RADIUS
FUSELAGE SKIN
WL 0.242
JACK (REF)
JACK SCREW EXTENSION
(EXAMPLE)
(ZERO SKIN CLEARANCE
FOR 6.0 [15.2] DIA)
CLEARANCE ANGLE
NOTE: THIS JACK POINT REQUIRES NO GSE ADAPTER. DIMENSIONS ARE IN INCHES (CENTIMETERS)
Tail Jack Point III - STA 2596 Figure 202
A42848
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
AIRPLANE RM852 REQUIRES ú 07-11-08
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