(2)  
Extend the jack ram to a length of 40 inches (1 meter).

 S 492-004

 (3)  
Put the stanchion below the aft jack point (stanchion adapter) on the airplane.

 S 492-003
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
 AIRPLANE RM852 REQUIRES  ú 07-11-08
 65B16363-1M-556087F STANCHION SUPPORT  ú
 FITTING BE INSTALLED PRIOR TO ADAPTER  ú 03 Page 201 ú Feb 18/01
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A

747-400
MAINTENANCE MANUAL

HEADSTOCK JAWS HEADSTOCK
JACK PAD 
LOCATION 
(STANCHION 
ADAPTER)  TAIL SUPPORT 
STANCHION 
HALYARD 

BOARD CIRCUIT HEADSTOCK  STANCHION ADAPTER
TOWBAR 
PUMP HYDRAULIC  GAUGE LOAD 
FOOT JACK 

Tail Support Stanchion Installation - STA 2596
Figure 201

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747-400 MAINTENANCE MANUAL
 D. Install the Support Stanchion (Fig. 201).
 S 422-014
 WARNING:_______DO NOT USE THE SUPPORT STANCHION TO LIFT THE AIRPLANE. IF YOU USE THE SUPPORT STANCHION TO LIFT THE AIRPLANE, IT CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE.
 (1)  Install the support stanchion.
 (a)  
Turn the valve on the stanchion base clockwise to the closed position.

 (b)  
Extend the stanchion until the headstock is approximately 10 inches (25 centimeters) below the support stanchion ball on the airplane.

 NOTE: Use the hydraulic pump on the stanchion base to extend
____
 the jack ram.

 (c)  
Move the valve on the headstock circuit board to the open position.

 (d)  
Use the pump to move the jaws on the headstock to their open position.

 NOTE: You will feel resistance in the pump handle when you get
____
 to the full open position.

 (e)  
With the rope halyard, extend the positioning pointer.

 (f)  
Move the stanchion if it is necessary until the stanchion is directly below the ball on the airplane.

 (g)  
Move the pointer down into the headstock.

 (h)  
Extend the stanchion until the ball on the airplane seats in the cup of the headstock.

 NOTE:____Use the pump to extend the stanchion. When the ball seats in the cup of the headstock, the pressure on the gauge will increase.

 (i)  
Move the valve on the headstock circuit board to the closed position.

 (j)  
With the pump, close the jaws of the headstock around the ball on the airplane.

 NOTE: You will feel resistance in the pump handle when you get
____
 to the closed position.

 (k)  Turn the valve on the stanchion base counterclockwise and see that the headstock stays attached to the airplane.
 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
 (l)  If the stanchion disengaged from the airplane, connect the stanchion to the ball again: 1) Extend the stanchion until the ball on the airplane seats
 in the cup of the headstock.
 NOTE:____Use the pump to extend the stanchion. When the ball seats in the cup of the headstock, the pressure on the gauge will increase.
 2) Move the valve on the headstock circuit board to the closed position. 3) With the pump, close the jaws of the headstock around the ball on the airplane.
　
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