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1) Remove the0.2500 in (6.35 mm) rig pin, STD-4232 from the crankshaft assembly [17].
2) If it is necessary, remove the tension from the forward cable assembly [19] and cable
assembly [64]:
a) Remove the locking clips [66] from the turnbuckles [65].
b) Turn the turnbuckles [65].
3) Install the 0.2500 in (6.35 mm) rig pin, STD-4232 in the inboard bellcrank assembly [67]
and the outboard bellcrank assembly [33].
4) Adjust the tension in the aft cable assembly [19] until it is in the limit of 200 ±25 pounds
(889 ±110 newtons).
5) Adjust the tension in the forward cable assembly [19] until you can easily remove and
install the rig pins in the bellcranks.
NOTE: Make sure the tension in the aft cable assembly [19] stays in the limit.
(g) Install the locking clips [66] in the turnbuckles [65] for the cable assemblies [19] and cable
assemblies [64].
(h) Remove the rig pins from the inboard bellcrank assembly [67], outboard bellcrank
assembly [33] and the crankshaft assembly [17].
SUBTASK 27-51-14-420-006
(7) Install the aft flap push rod assemblies [34]:
(a) Put the aft flap push rod assemblies [34] in their location between the aft flap [2] and the
bellcranks.
(b) Install the bolt [27], washer [28], bushing [29], washer [30] and nut [31] that attach the
inboard aft flap push rod assembly [34] to the inboard bellcrank assembly [67].
(c) Install the bushing [29], bolt [27], washer [28], washer [30] and nut [31] that attach the
outboard aft flap push rod assembly [34] to the outboard bellcrank assembly [33].
(d) Install the bushings [77], bolts [75], washers [76], washers [78] and nuts [79] that attach the
aft flap push rod assemblies [34] to the aft flap [2].
(e) Tighten the nuts [31] and nuts [79] to 50-80 pound-inches (5.6-9.0 newton-meters).
(f) Install pins [32] in the nuts [31].
(g) Install pins [80] in the nuts [79].
SUBTASK 27-51-14-820-002
(8) If the aft flap [2] is installed, do an adjustment of the aft flap push rod assemblies [34]:
(a) Use the crankshaft assembly [17] to manually move the aft flap [2] to the retracted position.
(b) Install the 0.2500 in (6.35 mm) rig pin, STD-4232 in the crankshaft assembly [17].
(c) Measure the distance between the trailing edge of the aft flap [2] and the trailing edge of
the upper cove panel [101] on the main flap [1] (Figure 402).
NOTE: Measure the distance aft of the inboard and outboard aft flap push rod
assemblies [34].
1) At the outboard push rod assembly [34], make sure the distance is 9.2745 ±0.0600
inches (235.57 ±1.52 millimeters).
2) At the inboard push rod assembly [34], make sure the distance is 9.2319 ±0.0600
inches (234.49 ±1.52 millimeters).
737-600/700/800/900
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BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
(d) If the distance at the inboard or outboard pushrod is not in the limit, then adjust the length of
the applicable aft flap push rod assembly [34] (Figure 401):
1) Remove the rig pin from the crankshaft assembly [17].
2) Use the crankshaft assembly [17] to manually extend the aft flap [2] to the extended
position.
3) Adjust the length of the applicable aft flap push rod assembly [34]:
NOTE: For each 90 degree turn of the aft flap push rod assembly [34], the trailing
edge of the aft flap will move 0.04 inches (1.02 millimeters).
a) Loosen the nuts [81] on the aft flap push rod assembly [34].
b) Adjust the length of the aft flap push rod assembly [34].
c) Tighten the nuts [81].
d) Install lockwire on the nuts [81] and the locking keys [74].
4) Use the crankshaft assembly [17] to manually retract the aft flap [2] to the retracted
position.
5) Install the 0.2500 in (6.35 mm) rig pin, STD-4232 in the crankshaft assembly [17].
6) Make sure the distance from the trailing edge of the aft flap [2] to the trailing edge of the
upper cove panel [101] is in the limit.
(e) Remove the rig pin from the crankshaft assembly [17].
(f) Use the crankshaft assembly [17] to manually extend the aft flap [2] to the extended
position.
SUBTASK 27-51-14-420-007
(9) Install the aft flap drive rod assembly [43]:
(a) Put the aft flap drive rod assembly [43] in its position between the drive rod fitting [44] and
the crankshaft assembly [17].
(b) Install the bolts [45], washers [46], bushings [47], washers [48] and nuts [49] that attach the
aft flap drive rod assembly [43] to the crankshaft assembly [17] and the drive rod fitting [44].
NOTE: Make sure the heads of the bolts [45] are on the inboard side.
(c) Tighten the nuts [49] to 30-50 pound-inches (3.4-5.6 newton-meters).
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737-600-700-800-900 AIRCRAFT MAINTENANCE MANUAL飞机维护手册4(112)
