(2)  
Measure and record exact shim and rub strip thickness for track installation.

(3)  
Remove bolt(s) attaching track to forward support fitting and remove track from airplane.

(4)  
If track forward support is being removed:

(a)  
Remove access panel 7216 or 7416 on top of wing (Ref Chapter 12, Access Doors and Panels).

(b)  
Remove bolts attaching forward support to wing and remove track support from airplane.

D.  Install Inboard Flap Outboard Track
(1)  If track forward support is being installed (Fig. 401):
(a)  
Install inboard attach bolts. 1) Coat exterior of flanged spacers and thick washers with grease. 2) Coat exterior of bolts with sealant. 3) Place countersunk washer and thick washer on bolt. 4) Install bolt with head down. 5) Install flanged bushing inside support fitting with flange up. 6) Locate phenolic rub strip between support fitting and wing.

(b)  
Locate support fitting on wing lower surface and temporarily secure inboard bolts with washer and nut.

(c)  
Install outboard attach bolts:

CAUTION:  ENSURE BOLTS WITH THE CORRECT GRIP LENGTH ARE USED TO SECURE THE FORWARD SUPPORT FITTING OR A FUEL LEAK MAY DEVELOP.
1) Coat exterior of bolts with sealant.
2) Locate phenolic rub strip between support fitting and wing.
3) Place countersunk washer on bolt and instal1 bolt with head down.
4) Secure bolt with washer and nut. Tighten nut 510 to 840 pound-inches.

(d)  
On airplanes with phenolic rub strip, tighten nuts on inboard attach bolts 180 to 250 pound-inches.

(e)  
On airplanes with aluminum rub strip, tighten nut on inboard attach bolts 510 to 840 pound-inches.

532 
27-51-161 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Jun 20/90 

G21793 G21949
505  Inboard Flap Outboard Track Installation 
Oct 20/84  Figure 401 (Sheet 1)  27-51-161 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Inboard Flap Outboard Track Installation  501 
27-51-161  Figure 401 (Sheet 2)  Feb 15/81 
Page 404 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(2)  
If rub strip has been damaged, install new rub strip as follows:

(a)  
Remove damaged rub strip and sealant from lower surface of wing.

(b)  
Apply primer to damaged area and allow to cure.

(c)  
Fabricate pressure plate from 0.50 inch minimum thick aluminum alloy plate. Drill three holes to match holes in wing structure.

(d)  
Bond rub strip to wing lower surface with sealant.

(e)  
Apply pressure plate and attach with three 7/16 inch diameter bolts and tighten nuts 360 to 420 pounds-inches.

NOTE:  Tighten nuts before expiration of sealant work life.

(f)  
Allow sealant to cure and remove pressure plate.

CAUTION:  DO NOT INSTALL TRACK UNTIL SEALANT HAS CURED. SEALANT MAY EXTRUDE FROM FAYING SURFACE.

(g)  
Apply fillet of sealant around periphery of rub strip and allow sealant to cure.

(h)  
Remove all sealant from lower surface of rub strip.

(3)  
If tapered shim has been damaged, install new tapered shim as follows: (ON AIRPLANES NOT INCORPORATING SB 57-1203)

NOTE:  Shim thickness must be same as shim that was removed.
On airplanes with bonded decal on wing rear spar adjacent to flap tracks , the decal shows the necessary shim thickness exclusive of rub strip thickness.
(a)  
Remove damaged tapered shim and sealant from upper surface of flap track.

(b)  
Temporarily install flap track as follows:

1)  Position flap track and temporarily install spacers, bushings, bolts, and nuts (View 1 and View 2, Fig. 401).
NOTE:  Rub strip must be installed on lower surface of wing prior to fitting tapered shim.
(c)  Attach flap track to forward support fitting. 1) Align track with forward support fitting. Ensure that shim is bonded to support
fitting. Install bolts with countersunk washer under head. 2) Install center bolt and tighten 900 to 1100 pound-inches. 3) Install washer and nut on inboard and outboard bolts. Tighten nuts 800 to 1000
pound-inches.
(d)  
Temporarily install trailing edge flap (Ref 27-51-12, R/I).

(e)  
Determine flap track shim thickness as follows: 1) Check that flaps are in fully retracted position. 2) Remove plug screws and attach inboard flap rigging tool at location marked by
　
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