(b)
Prepare to repair the cracks in the acrylic lens.
(c)
Repair the cracks in the acrylic lens.
TASK 57-21-11-308-001-B00
2. Repair the Middle Fairing__________________________
A. Standard Tools and Equipment
(1)
Drill Bit - Boeing Standard Tool ST1257B2810-600-1, .281 Dia., or equivalent.
(2)
Buffing wheels
(a)
Stitched muslin wheels - 4 inches to 10 inches diameter
(b)
Unstitched muslin wheels - 4 inches to 10 inches diameter
B. Consumable Materials
(1)
Cement - PS-18 or EC-2216B/A clear
(2)
Abrasive paper - Wet-or-dry 240, 280, 320, 400, 600 grit
(3)
Acrylic plastic sheet - Plexiglass 55, 0.10 inch thick
(4)
Cleaning solvent - Aliphatic Naptha
(5)
Soap and water
(6)
Masking tape
(7)
Cellophane
(8)
Clean cloth - chamois and cotton flannel
(9)
Rubber block (durometer reading of 35 |5, Shore A scale) or wood block
(10)
Buffing compounds
(a)
Learock No. S-30
(b)
Learock No. 888
(c)
0000 rouge
(d)
Dupont 7
(e)
Polysand
(11)
Wax - Simonize
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57-21-11
ALL ú ú B02 Page 801 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C.
D.
E.
A
737-300/400/500MAINTENANCE MANUAL
References
(1)
20-30-11, Adhesives, Cements and Sealants
(2)
20-30-31, Cleaners and Polishes
(3)
20-30-51, Miscellaneous MaterialsExamine the lens for cracks.
S 218-016-B00
(1)
Examine the lens for cracks to determine if the lens is repairable. (Fig. 801)
(a)
Continuous cracks in the acrylic plastic, which extend across the lens from one fastener hole to another in multiple locations, are acceptable provided a minimum of two fasteners are on each side of the crack.
(b)
If a continuous crack is found, inspect the lens during each subsequent A check and replace the lens at the next C check.
S 218-017-B00
(2) The navigation light lens is made of acrylic plastic. You can do the repairs if you find these defects:
(a)
Cracks in the acrylic plastic which are not longer than five inches.
(b)
Do these repairs before the defects are more than the crack limits. The repair limits are the same as the damage limits for the acrylic lens on the middle fairing.
Prepare to Repair the Cracks in the Acrylic Lens of the Middle Fairing
S 808-033-B00
(1) Choose which of the following cements to use for repairing the acrylic lens:
S 118-013-B00
WARNING:_______BE VERY CAREFUL WHEN YOU USE THE CEMENT. DO NOT MIX COMPONENT B DIRECTLY WITH COMPONENT C OR A DANGEROUS REACTION WILL OCCUR. DO NOT GET COMPONENT C ON YOUR SKIN. CLEAN THE SKIN AREA THAT TOUCHED THE MIXTURE IMMEDIATELY WITH SOAP AND WATER. IF YOU ARE NOT CAREFUL WHEN YOU USE THE CEMENT, IT CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE EQUIPMENT.
(2) Prepare the cement PS-18 (Component A - base, Component B -catalyst, Component C - promoter).
(a)
Add one capsule (2.4 grams) of component B to 4 fluid ounces (118cc) of component A.
(b)
Mix these components until they dissolve.
NOTE: You can keep this mixture until 24 hours at
____
35-40 degree F.
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