B. On inboard flap, if old inboard hinge is to be used, remove inboard hinge fitting from replacement inboard flap (DETAIL B). If old flap nose rod at inboard flap nose operating linkage is to be used, remove inboard flap nose rod from operating crank on replacement flap panel.
C. On inboard flap, remove bulb seal installed between inboard and outboard flap noses. (Seal is installed with five screws and retainer plate.)
D. Adjust center-to-center length of flap nose links on replacement flap panel (Section B-B). Lockwire adjustment nuts.
E. Lift flap panel to wing and install hinge bolts (Section D-D). Tighten bolts per Table I and install cotter pins.
F. On inboard flap, if old hinge fitting is to be used, connect fitting to flap panel (Detail B).
(1)
Align bolt holes in hinge fitting and flap.
(2)
Install shims between clevis of hinge fitting and lug on flap to eliminate all gaps over 0.004 inch. Maximum shim thickness on either side of lug is 0.070 inch. Install shims with wet primer.
(3)
Install bolts, washers and nuts with wet primer. Tighten nuts.
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27-81-12 Page 406 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 15/78
G. Install bonding jumpers at outboard hinge of each flap panel and also at inboard hinge on inboard flap panel.
H. Manually position flap to retracted position and check that no interference exists between flap nose and boost pump, upstop or inner surface of flap panel (Section C-C).
I. Connect flap actuator to lug on flap panel. Apply corrosion preventive compound to bolt before installing. Tighten nut 660 to 780 pound-inches and install cotter pin.
J. Provide system A hydraulic power (Ref 27-81-0 MP).
K. Retract leading edge flap using hydraulic pressure.
L. Attach adjustable angle protractor to flap and set to zero angle. Mark protractor location on flap for future use. On inboard flap, attach protractor to outboard end of flap. On outboard flap, attach protractor to inboard end of flap.
M. Extend leading edge flap with hydraulic pressure.
N. Attach protractor at same location as that for retracted position. Check that flap angle for extended position is 96 to 97 degrees. If not, disconnect actuator from flap panel. Adjust flap actuator rod end to attain required extend angle. Lockwire and seal. Connect actuator to flap panel, tighten nut 660 to 780 pound-inches and install cotter pin.
NOTE: Maximum adjustment of rod end is limited to two full turns.
O. Remove system A hydraulic power (Ref 27-81-0 MP).
P. At all locations except inboard flap nose linkage of inboard flap, connect free ends of flap nose links to lugs in wing. Tighten nuts 30 to 40 pound-inches and install cotter pins.
Q. At inboard flap nose linkage of inboard flap, if old flap nose rod installed in wing is to be used, connect to operating crank on flap, tighten nut 5 to 10 pound-inches and install cotter pin. If new rod attached to flap is to be used, connect to lug in wing, tighten nut 30 to 40 pound-inches and install cotter pin.
R. Fully extend flap by hand until actuator is bottomed out.
S. Rotate flap nose to contact pads on flap panel and hold in position until flap nose rods are adjusted.
T. Adjust length of flap nose rods to connect to operating cranks on flap panels with flap nose in contact with flap pads as indicated in View 1. Tighten and lockwire adjustment nuts.
U. Connect flap nose rods to operating cranks and tighten nuts 5 to 10 pound-inches. Install cotter pins.
V. Check clearances with flap retracted manually.
(1)
On inboard flap, disconnect flap nose rod from either outboard flap nose operating crank and leave disconnected until inboard flap nose clearances are checked. Restrain rod to prevent damage.
(2)
On inboard flap, at inboard flap nose, apply modeling clay to flap nose as required to check clearances at boost pump, upstop and inner surface of flap panel (Section C-C).
(3)
Retract flap to fully faired position by hand.
(4)
On inboard flap, at inboard flap nose, extend flap and check modeling clay impressions to check boost pump, upstop and flap panel clearances. If clearances are not as specified in section C-C, adjust linkage as follows:
(a)
Disconnect flap nose link and rod from operating crank.
(b)
To increase clearance at boost pump and upstop, increase length of flap nose link. Shorten link to increase clearance at inner surface of flap panel.
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