S 348-168
(7)
Let the glass fabric and adhesive cure for 24 to 36 hours at 75 to 90°F, or for 3 to 4 hours at 140 to 160°F.
S 348-066
(8)
If this is a decorative panel, do the procedure to repair the decorative surface.
J. Repair Panels that have Core Damage
NOTE: Use this procedure to repair panels that have
____
more than 0.5 inch of damage and damaged core.
There are two procedure for this repair.
S 348-169
(1)
Remove the damaged skin until you can see at least 0.5-inch of core that does not have damage.
S 348-170
(2)
Remove the damaged part of the core.
NOTE: Make sure 0.5 inch of core without damage is shown
____
on all sides of the damaged area.
S 118-115
(3)
Clean the area with a cheesecloth that is soaked with naphtha.
S 118-116
(4)
Dry the area with a clean cheesecloth.
S 348-138
(5)
Repair Procedure I
(a)
Mix (by weight) 109 parts of EC 3532A/B resin part A to 100 parts of part B.
(b)
Bond a piece of foam with the adhesive mixture to the area where the damaged core was removed.
NOTE: The foam thickness must be the same thickness as the
____ honeycomb core that was removed from the damaged area.
(c)
Let the repair cure for 2 hours at 75°F, or for 45 minutes at 160°F.
(d)
Repair the skin with the steps given before for panels that do not have core damage.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400 MAINTENANCE MANUAL
S 348-139
(6) Repair Procedure II
(a)
Use the manufacturer's instructions to mix the Epocast 1618A/B.
(b)
Fill the damaged area with the adhesive mixture.
(c)
Let the repair cure for 3 hours at 75°F.
(d)
Repair the skin with the steps given before for panels that do not have core damage.
K. Repair Potted Inserts
S 348-140
(1)
Remove the damaged skin and approximately 1/2-inch more on all sides of the damage.
S 118-120
(2)
Clean the area with a cheesecloth that is soaked with naphtha.
S 118-121
(3)
Dry the area with a clean cheesecloth.
S 348-141
(4)
Cut around the insert from the back side of the panel with a hole saw or an equivalent tool.
NOTE: Be careful not to cut the front side of the panel.
____
S 888-067
CAUTION: BE CAREFUL WHEN YOU APPLY HEAT NEAR MATERIALS THAT CAN BURN.
_______ THE TEMPERATURE OF THE TEDLAR MUST NEVER BE MORE THAN 200°F OR THE TEMPERATURE AT WHICH THE TEDLAR DISTORTS, WHICHEVER IS LOWER. TOO MUCH HEAT CAN CAUSE DAMAGE TO THE TEDLAR.
(5) Carefully increase the temperature of the insert until you can remove the insert from the panel.
NOTE: If you do not use heat during the removal of the insert,
____ damage to the front panel can occur. Refer to 20-11-25/201 for cautions to obey when you use heat guns.
S 348-142
(6)
Use the manufacturer's instructions to mix the Epocast 1618 A/B.
(7)
Fill the hole with the adhesive mixture.
S 348-143
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
25-00-00
ALL ú ú 01A Page 806 ú Oct 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 348-126
(8)
Push a new insert slowly into the mixture. Let the mixture flow around the insert and completely fill the hole.
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