S 224-028

 (4)  
Measure the dimension X at the No.4 flap ballscrew, at the flaps fully retracted position. Refer to this as dimension X1.

 NOTE: Keep a record of this dimension X1, which will be used for
____ the position transmitter installation.
 S 864-029
 (5)  
Supply the electrical power (AMM 24-22-00/201).

 S 864-030

 (6)  
Extend the flaps with alternate (electrical) drive, until you can get access to remove the flap position transmitter.

 (a)  
Put the ALTERNATE FLAP arm switch in the ARM position.

 (b)  
Move the ALTERNATE FLAP control switch to extend the flaps.

 (7)  
Remove the electrical power (AMM 24-22-00/201).

 S 024-005

 (8)  
Remove the position transmitter:

 (a)  
Remove the electrical connector from the position transmitter.

 S 864-031
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 27-58-12
 ALL  ú ú 01 Page 401 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SEE A
SEE B
UPSTOP (BALLSCREW NUT)
UPSTOP
(BALLSCREW YOKE)

DIMENSION "X"
A
MOUNTING BOLT (4 LOCATIONS) INBDFWD
ELECTRICAL CONNECTOR GEARBOX
FLAP POSITION
B
TRANSMITTER
Flap Position Transmitter Installation
Figure 401

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 27-58-12
 ALL  ú ú 02 Page 402 ú Jul 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (b)  
Remove the four bolts that attach the transmitter to the gearbox.

 (c)  
Remove the position transmitter.

 TASK 27-58-12-404-006
 3.  Flap Position Transmitter Installation (Fig. 401)______________________________________
 A. Consumable Materials
 (1)  
C00259 Primer BMS 10-11, Type 1

 (2)  
D00633 Grease BMS 3-33 (Recommended)

 (3)  
D00013 Grease MIL-G-23827 (Alternate)

 B.
References

 (1)  
SWPM 20-20-00, Standard Wiring Practices Manual

 (2)  
AMM 22-03-00/101, DFCS - Built-In Test Equipment

 (3)  
AMM 24-22-00/201, Manual Control

 (4)  
AMM 27-32-00/501, Stall Warning System

 (5)  
AMM 27-51-00/201, Trailing Edge Flap System

 (6)  
AMM 27-58-01/501, Trailing Edge Flap Position Indicating System

 C.
Access

 (1)  
Location Zone 307, 407 Wing Trailing Edge Outboard Flap and Spoilers

 D.
Prepare for the Installation

 S 864-007
 (1)  
Supply the electric power (AMM 24-22-00/201).

 S 864-010

 (2)  
Make sure the system B hydraulic power is removed
 (AMM 27-51-00/201).

 S 864-011

 (3)  
Move the flaps to the 25 unit position with alternate (electric) power:

 (a)  
Put the ALTERNATE FLAP arm switch in the ARM position.

 (b)  
Put the ALTERNATE FLAP control switch in the DOWN position to extend the flaps. 1) Extend the flaps until the dimension X is 25.52 to 25.68

 inches more than the dimension X1 that you recorded during transmitter removal. 2) Move the flap control lever to 25 unit position, to match the flap position.
 E. Install the Flap Position Transmitter
 S 824-012
 (1)  
Set the flap position indicator to the center of the white area at the 25-unit position:

 (a)  
Install the electrical connector on the position transmitter.

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