S 866-018

 (3)
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P7, Overhead Circuit Breaker Panel 1) 7E7, L STAB TRIM S/O VLV 2) 7E20, R STAB TRIM S/O VLV

 (4)  
Remove the electrical power (AMM 24-22-00/201).

 (5)  
Open the access door 312A (AMM 06-09-05/201).

 S 866-019
 S 016-020
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747-400 MAINTENANCE MANUAL
 S 216-021
 (6)  
Visually examine the upper and lower gimbals for cracks, corrosion, and parts that are worn or loose.

 S 966-022

 (7)  
If it is necessary, replace or repair the gimbals (AMM 27-41-06/401).

 S 416-023

 (8)  
Close the access door 312A (AMM 06-09-05/201).

 S 866-024

 (9)  
Set the STAB TRIM 2 and 3 switches to AUTO.

 S 866-025

 (10)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7E7, L STAB TRIM S/O VLV
 2) 7E20, R STAB TRIM S/O VLV

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747-400 MAINTENANCE MANUAL
 STABILIZER-TRIM ELEVATOR-CONTROL-ACTUATED LIMIT SWITCHES - ADJUSTMENT/TEST
__________________________________________________________________________
 1.  General_______
 A.  There are two tasks in this procedure :
 (1)  
The adjustment of the stabilizer trim elevator control actuated limit switches (which is referred to as the "actuated limit switches")

 (2)  
The operational test of the actuated limit switches.

 B.  
There are four limit switches that installed in pairs on a bracket aft of the elevator forward quadrant.

 TASK 27-41-07-835-001
 2.  Stabilizer Trim Elevator Control Actuated Limit Switches Adjustment___________________________________________________________________ (Fig. 501)
 A.  Special Tools and Equipment
 (1)  
G12001-50 Rig Pin Kit

 B.  
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 C.  
Access

 (1)  
Location Zone
 211 Passenger Cabin-Nose to First Door, LH

 D.  
Prepare for Adjustment

 S 015-002
 (1)  
Open the third middle ceiling panel forward of the No. 1 door for access to elevator controls.

 (2)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).

 S 865-003
 S 865-004
 WARNING: MOVE ALL PERSONS AND EQUIPMENT AWAY FROM THE ELEVATORS BEFORE
_______ YOU PRESSURIZE THE HYDRAULIC SYSTEMS. THE ELEVATORS CAN MOVE QUICKLY TO THE NEUTRAL AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  Do this task to pressurize the hydraulic systems No. 2 and 3: "Supply Hydraulic Power" (AMM 29-11-00/201).
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747-400
MAINTENANCE MANUAL

SEE A
RIGGING
PIN E-1

ELEVATOR FORWARD QUADRANT
SEE  B 
FWD 
A 

Elevator Control Actuated Limit Switches Adjustment
Figure 501 (Sheet 1)

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