(i)  
Connect the electrical connector.

 S 864-006
 (2) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P6 Load Control Center - Right
 1) AURAL WARN
 2) LIGHTS
 3) GEAR SWITCH & ANTI-SKID TEST

 TASK 31-26-12-714-024
 4.  Flap Landing Warning Switch Test________________________________
 A. General
 (1)  This task has two parts. The first part shows you how to adjust the switch. The second part is a test of the switch.
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 B.
C.
D.
E.
A
737-300/400/500MAINTENANCE MANUAL
 (2)  
Before you adjust the switch, the flap system must be correctly adjusted (Ref 27-51-00/501).

 (3)  
During the test it will be necessary to retract the right main gear. You can put the airplane on jacks or put the airplane landing gear in a simulated position.

Equipment and Materials

 (1)  
Flap Drum Checknut Wrench - F80197

 (2)
Gear Ground Lockpins - F72735References

 (1)  
7-11-11/201, Jacking and Shoring

 (2)  
24-22-00/201, Manual Control

 (3)  
27-51-00/201, Trailing Edge Flap System

 (4)  
27-51-00/501, Trailing Edge Flap System

 (5)  
27-51-32/501, Inboard Flap Track Fairings

 (6)  
29-15-00/201, Hydraulic System A, B, or Standby

 (7)
31-26-00/501, Aural Warning SystemAccess

 (1)  
Location Zone 101/102 Control Cabin

Procedure
 S 864-007
 (1)  
Pressurize the hydraulic system B to 3000 psi (Ref 29-15-00/201, and 27-51-00/201).

 S 864-009

 (2)  
Supply electrical power (Ref 24-22-00/201).

 S 864-010

 (3)  
Retract the flaps with the flap control lever to the zero unit position and hold for 5 minutes.

 NOTE: Do not use alternate drive.
____
 S 014-011
 (4)  
Remove the fairing for the No. 4 inboard flap track.

 S 974-012

 (5)  
Make a record of the dimension between the upstop of the ballscrew nut and the upstop on the screw yoke (AMM 27-51-32/501).

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737-300/400/500MAINTENANCE MANUAL
 S 864-013
 (6)  Move the flap control lever to the 15 unit position.
 NOTE: If it is necessary, position the flaps electrically until
____ dimension X is 23.17 to 23.32 inches more than the dimension you made a record of before (Ref 27-51-00/501).
 S 824-014
 (7)  Adjust the switch:
 (a)  
Temporarily adjust the switch in the direction of the cam until it operates.

 (b)  
Turn the inner nut to move the switch away from the actuator cam until the switch operates.

 NOTE: You will hear a click when the switch operates.
____
 (c)  
Tighten the inner and the outer checknuts on the switch.

 (d)  
Put a lockwire on the switch.

 (e)  
Do a check of the switch continuity or push on the switch roller and listen for the switch to operate.

 S 414-015
 (8)  
Put the cover on the flap control unit.

 S 414-016

 (9)  
Put on the fairing for the No. 4 inboard flap track (Ref 27-51-32/501).

 (10)
 Put the airplane on jacks (Ref 7-11-11/201).

 S 584-019
 NOTE: If airplane jacks are not available you can use a simulated
____ gear position. Continue with the test until it is necessary to have the landing gear retracted.
 S 864-037
 (11) Make sure all the gear ground lockpins are installed.
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