SUBTASK 27-51-22-980-002
(8) Support the aft flap assembly [2] to make sure the programming rollers [21] touch the bottom
surface of the programming tracks and the aft rollers for the aft flap tracks touch the top surface
of the tracks.
NOTE: This is the position the rollers will be in with airloads applied to the aft flap assembly [2].
SUBTASK 27-51-22-220-004
(9) Measure the clearance between the main flap [1] and the upper surface of the aft flap
assembly [2] (View C) (Figure 402).
NOTE: Measure the clearance at all of the cove panel supports [51] and at the aft flap roller
fittings [60].
SUBTASK 27-51-22-220-007
(10) Make sure that the rub strip [50] and teflon coating on the upper surface of the aft flap
assembly [2] are not damaged (View C) (Figure 402).
(a) If the rub strip [50] is damaged or missing, then do this task, do this task: Bonded Phenolic
or Stainless Steel Rub Pad Repair (Heat Source Available) , TASK 51-51-00-340-802.
(b) If the telfon coating is damaged, then do this task, do this task: Abrasion Resistant Teflon
Finish Application, TASK 51-21-81-390-801.
SUBTASK 27-51-22-820-004
(11) If the clearance between the main flap [1] and the aft flap assembly [2] is not in the limit of 0.010
+0.100/-0.010 inch (0.25 +2.54/-0.25 mm), then change the thickness of the shims [58] on the
cove panel support [51] or the shims [59] on the aft flap roller fittings [60].
(a) Remove the rig pins from the bellcranks [12].
(b) Extend the aft flap assembly [2], until you can get access to the fasteners for the shims [58]
and [59]. To extend the flaps, do this task: Extend the Trailing Edge Flaps,
TASK 27-51-00-860-803.
(c) If it is necessary, change the thickness of the shims [58] on the cove panel supports [51]:
1) Remove the nuts [57], washers [56] and bolts [55] that attach the cove panel [52] to the
cove panel support [51].
2) Remove the shim [58] from the cove panel support [51] and the cove panel [52].
3) Change the thickness of the shim [58].
NOTE: The maximum permitted thickness of the shim [58] is 0.050 inch (1.27 mm).
4) Apply sealant, A00247 to the mating surfaces of the shim [58].
5) Put the shim [58] in its position between the cove panel support [51] and the cove panel
[52].
6) Install the bolts [55], washers [56] and nuts [57].
(d) If it is necessary, change the thickness of the shims [59] on the aft flap roller fittings [60]:
1) Remove the nuts [63], washers [62] and bolts [61] that attach the cove panel [52] to the
aft flap roller fitting [60].
2) Remove the shims [59] from the aft flap roller fitting [60] and the cove panel [52].
3) Change the thickness of the shims [59].
NOTE: The maximum permitted thickness of the shim [59] is 0.050 inch (1.27 mm).
4) Apply sealant, A00247 to the mating surfaces of the shims [59].
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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5) Put the shims [59] in their position between the aft flap roller fitting [60] and the cove
panel [52].
6) Install the bolts [61], washers [62] and nuts [63].
7) If it is necessary, trim the excess shim [59] that extends past the aft flap roller fitting
[60].
(e) Retract the aft flap assembly [2] until you can install the rig pins in the bellcranks [12]. To
retract the flap, do this task: Retract the Trailing Edge Flaps, TASK 27-51-00-860-804.
(f) Install the rig pins in the bellcranks [12].
(g) Make sure the clearance between the main flap [1] and the upper surface of the aft flap
assembly [2] is in the limit.
SUBTASK 27-51-22-220-006
(12) Measure the deflection of the upper cove panel [52] of the main flap [1] at the inboard and
outboard ends of the aft flap assembly [2]:
NOTE: The aft flap assembly [2] can push up on the upper cove panel [52] and cause the panel
to deflect.
(a) Make sure the delection is a maximum of 0.200 inch (5.08 mm).
SUBTASK 27-51-22-220-005
(13) Make sure the seals on the aft lower surface of the main flap [1] are in the correct position:
(a) Measure the distance between the aft edge of the seal [54] and the seam on the lower
surface of the aft flap assembly [2] (View A-A).
NOTE: This distance is called DIMENSION Y.
(b) At the inboard end of the aft flap assembly [2], make sure that DIMENSION Y is 5.76 ±0.10
inch (146.3 ±2.54 mm).
(c) At the inboard side of the inboard flap support, make sure that DIMENSION Y is 5.57 ±0.10
inch (141.48 ±2.54 mm).
(d) At the outboard side of the inboard flap support, make sure that DIMENSION Y is 5.46
±0.10 inch (138.68 ±2.54 mm).
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