22-21-31
 ALL  ú ú 01 Page 501 ú Nov 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

SEE  A 
UNIT CONTROL FLAP 
BSEE COVER SWITCH 

FWD INBD
A
MACH TRIM
FLAPS 10-DEGREE
SWITCH (S290)
SWITCH (S584)
(REF 27-88-21)

RETAINING
NUTS
ROLLER
GUIDE
(TYPICAL)

PIN
LANDING WARNINGFLAPS UP SWITCH (S138)LIMIT SWITCH (REF 31-26-12)
(S245)
(REF 27-51-291)

TAKEOFF WARNING SWITCH (S130) (REF 31-26-23)
STALL WARNING
SWITCH (S856)
(REF 27-88-31) FLAPS

DOWN LIMIT SWITCH (S246)INBD (REF 27-51-291)
B
Mach Trim Flap Switch Adjustment
Figure 501

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 ALL  ú ú 01 Page 502 ú Oct 25/85
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

SEE  A 
ASSEMBLY TRANSMISSION FLAP  NUT UPSTOP BALL SCREW  DOWNSTOP 
JACKSCREW 
BALL SCREW YOKE  YOKE UPSTOP BALL SCREW BSEE  SCREW NUT BALL  FWD 
A 
(SCREW YOKE) UPSTOP  (BALL SCREW NUT) UPSTOP 

DIMENSION X B Flap Jackscrew StopsFigure 502
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A 737-300/400/500MAINTENANCE MANUAL
 S 865-038
 (2)  Put the alternate flap drive switch in the UP position. When the flap drive stops at the full up position, set the flap drive switch to the OFF position.
 S 865-039
 (3)  At the number 4 and 5 jackscrews, make sure that the upstop on the ball screw nut is 1-3/4 to 2-1/4 turns from the upstop on the ball screw yoke. In this position the length of dimension X as shown in Fig. 502 must be between 0.87 to 1.03 inches. If you do not get this dimension, adjust the flap up limit switch (AMM 27-51-87) before you adjust the mach trim flap switch.
 S 865-040
 (4)  Measure and write down this dimension X and identify it with the label X1.

 S 865-041
 (5)  
Put the alternate flap switch to the DOWN position for several turns of the jackscrew.

 S 865-042

 (6)  
Put the alternate flap drive switch to the UP position. Release the switch to stop the flaps to make sure dimension X will equal X1 plus

 0.10 |0.05 inch. You must move the flaps in the up direction to get this dimension.
 S 865-043
 (7)  Adjust the retaining nuts on the mach trim flap switch to move the switch body as near as you can to the actuating cam. Then adjust the retaining nuts to move the switch away from the actuating cam until the switch operates (audible click).
 NOTE: Carefully preposition the switch to make sure that the
____ operation occurs when the switch body moves away from the cam.
 S 435-006
 (8)  
Tighten the switch retaining nuts.

 S 415-007

 (9)  
Replace the switch cover on the flap control unit.

 S 865-008

 (10)
 Use the alternate flap drive switch to put the flaps to 1 unit.

 (11)
 Put the flap control lever in the 1 unit position.

 S 865-047
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-009
 (12)
 Put the alternate flap switch in the OFF position.

 S 715-010

 (13)
 Do the Mach Trim Flap Switch Operational Test.

 S 415-011

 (14)
 Install the inboard flap track fairings (AMM 27-51-32/401).
　
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