EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-00-01
 ALL  ú ú 01 Page 203 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H46866
A
747-400 MAINTENANCE MANUAL
INDEX MARKS
SEE  A  ADAPTER 
ADAPTER  PLATE 
SHAFT 
ACTUATOR MOUNTING 
HOLE (4 LOCATIONS) 
ACTUATOR MOUNTING 
SCREW (4 LOCATIONS) 
WASHER 
(4 LOCATIONS) 

ELECTRICAL
CONNECTOR

INDEX PLATE
VALVE BODY MANUAL OVERRIDEINDEX PLATE LEVERMOUNTING SCREW BONDING ACTUATOR (3 LOCATIONS) JUMPER
SPAR
VALVE ACTUATOR - ELECTRICAL CONNECTION ON THE SIDE (EXAMPLE)
VALVE BODY
INDEX MARK FOR
MOUNTINGTHE VALVE BODY BRACKET
INDEX MARKS FOR THE ADAPTER SHAFT
INDEX MARKS A
Manually Aligned - Adapter Plate Figure 202
H46868
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-00-01
 ALL  ú ú 01 Page 204 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 822-003
 (2)  Do these steps to align the adapter shaft (Procedure 1, optional to Procedure 2):
 NOTE: This procedure finds the point where the internal valve
____ butterfly engages the valve seal. The torque necessary to turn the shaft increases as the butterfly engages the seal, then decreases as the butterfly leaves the other side of the seal. Once the edge of the seal is found, the valve shaft will then be turned to center the butterfly on the seal.
 (a)  
Put the tool handle in the extreme counterclockwise position.

 (b)  
Turn the handle slowly in the clockwise direction at a constant rate while you note the changes in the torque necessary to turn the handle.

 (c)  
Do the previous steps as many times as necessary to find the point in the rotation where the torque necessary to turn the handle increases significantly.

 (d)  
If you cannot find the position in the rotation where the torque increases significantly, then use Procedure 2 below.

 (e)  
Put the shaft in the extreme counterclockwise position again.

 (f)  
Slowly and smoothly turn the handle of the tool clockwise until a distinct increase in torque is found and immediately stop turning the handle.

 (g)  
Read the scale on the tool.

 NOTE: This is the point where the valve butterfly starts
____
 to engage the edge of the seal.

 (h)  Turn the handle 13 degrees more in the clockwise direction (the scale on the tool is calibrated in degrees).
 NOTE: The valve butterfly is now centered on the valve seal.
____ If you turn the handle past the target value, do not turn the handle back in the counterclockwise direction again. You must start the procedure again with the handle in the extreme counterclockwise position.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-00-01
 ALL  ú ú 01 Page 205 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 822-004
 (3)  Do these steps to align the adapter shaft (Procedure 2, optional to procedure 1):
 NOTE: A torque meter is necessary to do this procedure.
____
 (a)  
Put the tool handle in the extreme counterclockwise position.

 (b)  
Slowly and smoothly turn the tool handle to the extreme clockwise position while you monitor the torque that you apply to the handle.

 (c)  
Write down the maximum torque that you apply to the tool while you turn it from the extreme counterclockwise position to the extreme clockwise position.

 (d)  
Turn the tool back to the extreme counterclockwise position.
　
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 燃油 FUEL 1(13)