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3C24

CHAPTER

55

STABILIZERS

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CHAPTER 55 - STABILIZERS 
TABLE OF CONTENTS / EFFECTIVITY 
CHAPTER/ SECTION  SUBJECT  GRID NO.  EFFECTIVITY 

55-20-00  STABILATOR 3D6
Stabilator 3D6 Removal and Installation 3D6
Stabilator Trim Tab  
3D6
Removal and Installation 3D6 Stabilator Balance 3D6
Balancing Equipment 3D8 Balancing Stabilator 3D8 Stabilator Skin Repair 3D8
55-30-00 VERTICAL STABILIZER 3D10 Removal and Installation 3D11
55-40-00  RUDDER 3D12 Removal and Installation 3D12 Rudder Trim Tab 3D12
Removal and Installation  
3D12
Rudder Balance 3D14 Balancing Rudder 3D15
55-Cont./Effec. Page 55-3 Issued: April 1, 1997
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55-Cont./Effec. Page 55-4 Issued: April 1, 1997
3D4
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STABILATOR AND TAB.
STABILATOR.
REMOVAL AND INSTALLATION OF STABILATOR. (Refer to Figure 55-1.)
The stabilator assembly can be removed by following the procedure given below.
1.  
Remove the fin tip attachment screws and disconnect the light at quick disconnect then remove tip assembly.

2.
Disconnect trim push rod and push rod attached to stabilator balance weight arm.

3.  
Remove balance weight arm from stabilator by removing attachment bolt at the forward and aft arm mounting fitting.

4.
Remove the two hinge bolts at the pivot points and remove the stabilator.

5.
Reinstall the stabilator in reverse of removal instructions.

6.
Check attaching hardware for proper installation.

STABILATOR TRIM TAB.
REMOVAL AND INSTALLATION OF STABILATOR TRIM TAB. (Refer to Figure 55-1.)
The trim tab can be removed by following the procedure given below.
1.
Disconnect the trim push rod from the trim horn.

2.
Remove the hinge pins and remove the trim tab.

3.
Reinstall the trim tab in reverse of removal instructions, with new hinge pins.

STABILATOR BALANCE.
The stabilator has been statically balanced at the time of installation at the factory and normally should not require rebalancing. Where possible the stabilator was set with the balance weight on the heavy side of the limits to permit limited repair or paint touch-up without adjusting the balance weight. It should be noted, however, that spare stabilators are delivered unpainted and the static balance will not necessarily fall within the limits provided. This is more pronounced on the stabilators and rudders.  The completed stabilator including paint should be within the limits given in Figures 55-2. If the surface is not to be painted, the balance weight will probably require adjustment. Replacement stabilators or stabilators that have been repainted or repaired should be rebalanced according to the procedures given in this chapter.  The static balance of the surfaces must be as specified in the figures referenced above.
Before balancing any control surface, it must be complete including tip, trim / servo tabs as applicable and tab actuating arms or push rods with bearings as applicable and all optional equipment which is mounted on or in the control surface when it is flown, including paint, position lights and wiring, static wicks, scuff boots, etc.
If optional equipment is added or removed after balancing, the control surface must be rebalanced.  During balancing, trim/servo tabs must be maintained in the neutral position.
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3D6
A595 SKETCH A  SKETCH B  SKETCH C 
BOLT AN3-4A WASHER AN960-10L NUT MS20365-1032C  WASHER AN960-416L OR WASHER AN960-416 ALTERNATE WASHERS AS BOLT AN4-6A WASHER AN960-416 NUT MS20365-428C 
BOLT AN3-10A WASHER AN960-10 (2 REQ.) NUT MS20365-1032C (2 REQ.)  REQUIRED TO LIMIT SIDE PLAY TO .010 MAX. (4 REQ. ) 
SKETCH D BOLT AN3-4A WASHER AN960-10L (6 REQ.)  BOLT AN4-7A WASHER AN960-416 NUT MS20365-428C (4 REQ. ) BOLT NAS1104-17 WASHER AN960-416 (UNDER BOLT 
SKETCH E HEAD) WASHER AN960-416 (UNDER NUT) NUT H10-4 (2 REQ.) 
96564-0 BAL. PLATES AN4H-6A BOLTS (2 REQ. ) AN960-416C WASHER(S) AN4-20A AN960-416A (UNDER HEAD) MS20365-428C (2 REQ. )  D B A C F B A E 
SKETCH F BOLT AN4-12 WASHER AN960-416 (2 REQ. ) NUT AN310-4 COTTER PIN MS24665-132 

Figure 55-1. Stabilator Installation 
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3D7 

BALANCING EQUIPMENT.
The balancing must be done using a suitable tool capable of measuring unbalance in inch-pounds from the center line of the control surface hinge line.  A suggested tool configuration is shown in Chapter 91.  Other tool configurations may be used, provided accuracy is maintained and recalibration capability is provided.  The tool shown may be calibrated by placing it on the control surface to be balanced with the balance points over the control surface hinge center line and balance bar parallel to the cord line.  Position the trailing edge support on the tool to align the tool with the control surface cord line and secure it in this position.  Remove the tool without disturbing the trailing edge support and balance the tool by adding weight to the light end as required. (The movable weight must be at the center line.) Place the tool on the control surface perpendicular to the hinge center line as shown in Figure 55-2. Read the scale when the bubble level has been centered by adjustment of the movable weight.
　
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