4. Procedure_________
Subtask 27-51-00-820-084
A. General
(Ref. Fig. 529/TASK 27-51-00-991-079, 531/TASK 27-51-00-991-096)
(1) Flap Rigged Position:
(a) The 'flap rigged position' is the position that gives the correct relation between:
-the flap trailing edge
-and
-the top surface of the wing.
In this position the correct aerodynamic conditions for the best flight performance are set.
(b) To put the flaps in their rigged position, eccentric bearings in the attachments at the flap tracks are adjusted. At each track there are two eccentric bearings:
-
the main eccentric bearing
-
the forward eccentric bearing.
(2)
Main Eccentric Bearing:
-The main eccentric bearing is the spherical bearing at the flap carriage attachment and is used for standard rigging. Movement of this bearing causes the complete flap to move vertically in relation to the wing.
(3)
Forward Eccentric Bearing:
-The forward eccentric bearing is on the flap drive-arm and is adjusted only for assymetric rigging conditions (Ref. SIL 27-089). When this bearing is adjusted, only the trailing edge of the flap moves (vertically) at that position.
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Eccentric Bearings - General
Figure 531/TASK 27-51-00-991-096
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Subtask 27-51-00-480-064
B. Install Distance Gages On the Tab of the Outboard Flap
(Ref. Fig. 532/TASK 27-51-00-991-081, 533/TASK 27-51-00-991-082)
(1)
At track 3, disconnect the tab drive control-rod (42) from the track 3 carriage (30):
(a)
Remove and discard the cotter pin (33).
(b)
Remove the nut (34), the washer (32), the bolt (44) and the loose bush (31).
(2)
At track 4, disconnect the tab drive control-rod (60) from the track 4 carriage (50):
(a)
Remove and discard the cotter pin (65).
(b)
Remove the nut (64), the washer (63) and the loose bush (62).
(c)
Remove the hinge pin (52) sufficiently to let the tab drive control-rod (60) be removed. Do not fully remove the hinge pin (52).
NOTE : If you fully remove the hinge pin (52) from the carriage
____ (50), the roller bearing block (51) will fall out of alignment.
(3)
Carefully, let the tab move to the fully extended position.
(4)
Install the DISTANCE GAUGES (98D27504115000) (17) and (15):
(a)
Manually push the tab forward.
(b)
At the track 3 position, put a distance gage (17) in position each side of the track and install the pins (18) and (19).
(c)
At the track 4 position, put the distance gage (15) in position and install the pin (16).
(5)
Manually retract the flaps to the fully retracted position (Ref. TASK 27-50-00-866-012).
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Subtask 27-51-00-480-066
C. Install the Outboard Flap Rigging Kit
(Ref. Fig. 529/TASK 27-51-00-991-079, 534/TASK 27-51-00-991-083, 535/TASK 27-51-00-991-084)
(1)
Install the PIN RIGGING FLAPS (98D27504006000) (70) at the track 1 thru 4 positions.
(2)
At the track 3 and 4 positions, install the KIT-FLAP RIGGING (98D27504113001):
(a)
Install the base assembly (83) on the flap track beam (88). Make sure that the aft dowels (85) touch the track beam end-stop (84).
(b)
Move the two bottom clamps (86) into position below the flap track beam (88) and tighten the knurled screws (87).
(c)
Move the fin (81) into position in the slot on the base assembly
(83)
and install the pin (82).
(Ref. Fig. 536/TASK 27-51-00-991-085)
(d) Check the value shown on the label (100) attached to the outboard side of the flap track 3 beam assembly.
NOTE : Label (100) shows the assymetric offset value. This is the
____ adjustment applied to the forward eccentric bearing in the flap drive strut at tracks 3 and 4. The adjustment is necessary on some aircraft to give the correct aerodymamic balance:
-
a plus (+) value shows that the flap trailing edge was moved up
-
a minus (-) value shows that the flap trailing edge was moved down
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