S 865-047
 (4)  
Remove the system B hydraulic power (AMM 27-51-00/201).

 S 225-139

 (5)  
Measure and make a record of the dimension X at the No. 4 flap ballscrew (Fig. 505). Refer to this as the dimension X1.

 S 735-048

 (6)  
Do a test of the left asymmetry shutoff system:

 (a)  
Use the alternate flap system to extend the flaps to the 25-unit position: 1) Move the ALTERNATE FLAP arm switch to the ARM position. 2) Move the ALTERNATE FLAP control switch to the DOWN position

 to extend the flaps.
 a) Extend the flaps until the dimension X is 25.52 to

 25.68 inches more than the dimension X1 (This is the
 25-unit position). b) Release the ALTERNATE FLAP control switch. c) Put the ALTERNATE FLAP arm switch in the OFF position.
 (b)  
Remove the four bolts that attach the flap position transmitter to the gearbox (Fig. 506).

 (c)  
Remove the transmitter from the gearbox.

 (d)  
Turn the input shaft of the position transmitter clockwise until the red indicator lever on the bypass valve moves to the position 2.

 (e)  
Make sure the angle between the pointers on the flap position indicator is 8 to 20 degrees (a chordal dimension of 0.08 to

 0.21 inch) (Fig. 507).
 (f)  
Turn the input shaft of the position transmitter counterclockwise until the red indicator lever on the bypass valve moves to the position 1.

 (g)  
Make sure the angle between the pointers on the flap position indicator is 5 to 17 degrees (a chordal dimension of 0.05 to

 0.18 inch).
 NOTE: The pointer must move a minimum of 3 degrees before the
____
 indicator on the bypass valve moves.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SEE A
MOUNTING BOLT (4 LOCATIONS) INBDFWD
ELECTRICAL CONNECTOR GEARBOX
FLAP POSITION
A
TRANSMITTER
Flap Position Transmitter Installation
Figure 506

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 
737-300/400/500MAINTENANCE MANUAL
 (h)  Turn the input shaft of the position transmitter
 counterclockwise until the red indicator lever on the bypass
 valve moves to the position 2.
 (i)  Make sure the angle between the pointers on the flap position
 indicator is 8 to 20 degrees (a chordal dimension of 0.08 to
 0.21 inch).
 (j)  Turn the input shaft of the position transmitter clockwise
 until the red indicator lever on the bypass valve moves to the
 position 1.
 (k)  Make sure the angle between the pointers on the flap position
 indicator is 5 to 17 degrees (a chordal dimension of 0.05 to
 0.18 inch).
 NOTE:____ The pointer must move a minimum of 3 degrees before the
 indicator on the bypass valve moves. 

Flap Asymmetry Test Equipment
Figure 507

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (l)  Turn the input shaft of the position transmitter clockwise, until the left pointer on the position indicator aligns with the right pointer.
 NOTE: When you turn the input shaft clockwise, the pointer
____ should move to the UP position. If the pointer moves to the 40-unit position, turn the input shaft clockwise until the left pointer aligns with the right pointer.
 Lightly hit the position indicator with your finger to remove the friction error.
　
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