55-30-00 Page 55-9 Issued: April 1, 1997
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VERTICAL STABILIZER.
REMOVAL AND INSTALLATION OF VERTICAL STABILIZER. (Refer to Figure 55-3.)
1.
Remove the fin tip, tail fairing, dorsal fin at the forward edge of the fin. Disconnect upper and lower tail lights at the quick disconnects.
2.
Separate the stabilator trim cable, rudder trim cable and rudder cable at the turnbuckles and remove the cables.
3.
Remove the rudder per removal instructions.
4.
Remove the stabilator per removal instructions.
5.
Disconnect the antenna wire from the antenna assembly, attach a fishing line to the antenna cable before removing it from the fin conduit.
6.
Remove stabilator control push rod from the fin by disconnecting attachment hardware at the balance weight arm and at bellcrank.
7.
Remove the two bolts at the leading edge of the fin.
8.
Remove the bolts which secure the fin spar to the aft bulkhead. Remove the fin.
9.
Install the fin in reverse of removal instructions. Check all bolts for safety. Refer to installation and rigging of stabilator trim cable, rudder trim cable and rudder cable for adjustment of cables.
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55-30-00 Page 55-11 Issued: April 1, 1997
RUDDER.
REMOVAL AND INSTALLATION OF RUDDER. (Refer to Figure 55-4.)
1.
Remove the fairing.
2.
Disconnect the trim push rod by removing one bolt from the push rod.
3.
Disconnect the rudder cables at the turnbuckles within the fuselage tail section and disconnect the cable from the rudder sector.
4.
While supporting the rudder, remove the hinge bolts and remove the rudder from the fin.
5.
Install the rudder in reverse of removal instructions; check cable tension if disturbed.
RUDDER TRIM TAB.
REMOVAL AND INSTALLATION OF RUDDER TRIM TAB. (Refer to Figure 55-4.)
1.
Disconnect trim push rod.
2.
Remove the hinge pin and remove trim tab.
3.
Install the trim tab in reverse of removal instructions, with new hinge pin.
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55-40-00 Page 55-12 Issued: April 1, 1997
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1.
UPPER RUDDER HINGE
2.
RUDDER TRIM TAB
3.
TRIM TAB HINGE
4.
RUDDER SECTOR
5.
RUDDER SECTOR STOP
6.
LOWER RUDDER HINGE
7.
RUDDER STOP ADJUSTMENT BOLT
Figure 55-4. Rudder Installation
55-40-00 Page 55-13 Issued: April 1, 1997
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RUDDER BALANCE.
The rudder has been statically balanced at the time of the installation at the factory and normally should not require rebalancing. Where possible the rudder 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 rudders are delivered unpainted and the static balance will not necessarily fall within the limits provided. The completed rudder including paint should be within the limits given in Figure 55-5. If the rudder is not to be painted, the balance weight will probably require adjustment. All replacement rudders or rudders that have been repainted or repaired should be rebalanced according to the procedures given in this chapter. The static balance of the rudder must be within the limits specified in the figure 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.
55-40-00 Page 55-14 Issued: April 1, 1997
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BALANCING RUDDER. (Refer to Figure 55-5.)
1. Insure that the control surface is in its final flight configuration, static wicks, trim tabs, trim tab push-pull rod and control surface tip (as applicable) should be installed. The surface should be painted and trim,servo tabs should be in the neutral position.
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