(a)  
Remove the screws that attach the switch assembly to the LE flap PDU.

 (b)  
Remove the switch assembly from the LE flap PDU.

 S 024-031
 (6)  Remove the switch actuator from the alternate position controller for damage inspection or replacement.
 NOTE: The switch actuator is a small stainless steel plate
____ installed directly below the switch assembly. Replace the switch actuator, if it is damaged.
 TASK 27-88-01-404-007
 3. Sensitive Annunciator Feedback Switch Assembly Installation (Fig. 401)
______________________________________________________________________
 A. References
 (1)  
AMM 27-81-00/201, Leading Edge Flap System

 (2)  
AMM 27-88-00/501, Leading Edge Flap Position Indicating System

 (3)  
AIPC 27-81-03, Fig. 1

 (4)  
SSM 27-88-01, SSM 27-88-02

 (5)  
WDM 27-88-11, WDM 27-88-12

 B.
Access

 (1)  
Location Zone
 535 Variable Camber Flap, LH
 525 Variable Camber Flap, LH
 523 Variable Camber Flap, LH
 513 Krueger Flap, Inboard - Center, LH
 613 Krueger Flap, Inboard - Center, RH
 623 Variable Camber Flap, RH
 625 Variable Camber Flap, RH
 635 Variable Camber Flap, RH

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A
747-400 MAINTENANCE MANUAL
 C. Procedure
 S 424-032
 (1)  
Install the switch actuator in the alternate position controller with the steps that follow:

 (a)  
Install the switch actuator with the actuator tangs in the center of the holes (not touching edges of holes) of the alternate position controller.

 (b)  
Tighten the screws.

 NOTE: Make sure the tangs of the new actuator do not touch the
____ edges of the alternate position controller holes when you tighten the screws.
 S 424-008
 (2)  
Install the switch assembly:

 (a)  
Set the switch assembly on the LE flap PDU.

 (b)  
Install four screws.

 (c)  
Install the lockwire.

 S 434-009
 (3)  
Install the electrical connector.

 (a)  
Install the lockwire.

 S 864-014
 (4)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7C10, FLT CONT ELEC 2L AC
 2) 7C11, FLT CONT ELEC 2L DC
 3) 7C12, FLT CONT ELEC 1L AC
 4) 7C13, FLT CONT ELEC 1L DC
 5) 7C14, FLT CONT ELEC 1R AC
 6) 7C15, FLT CONT ELEC 1R DC
 7) 7C16, FLT CONT ELEC 2R AC
 8) 7C17, FLT CONT ELEC 2R DC

 S 864-022
 (5)  
Do this task: "Safety Locks Removal and Extended Leading Edge Flaps Activation" (AMM 27-81-00/201).

 S 714-024

 (6)  
Do this task: "Operational Test - Leading Edge Flap Position Indicating System" (AMM 27-88-00/501).

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