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AC 43.13-1B 9/8/98 FIGURE 3-24. Temporary repairs to cracked windshields or windows. windshield cleaner especially approved for use on aircraft transparent plastics. These cleaners may be purchased through aircraft supply houses. f. Waxing. A thin coating of wax will fill any minute scratches that may be present and will cause rain to form droplets that are easily blown away by the wind. 3-41. PROTECTION. Acrylic windshields are often called “lifetime” windshields, to dis tinguish them from those made of the much shorter-lived acetate material. However, even acrylic must be protected from the ravages of the elements. a. When an aircraft is parked in direct sunlight, the windshield will absorb heat and will actually become hotter than either the in side of the aircraft or the outside air. The sun will cause the inside of a closed aircraft to be come extremely hot, and this heat is also ab sorbed by the plastic windshield. b. To protect against this damage, it is wise to keep the aircraft in a hangar. If this is not possible, some type of shade should be provided to keep the sun from coming in direct contact with the windshield. Some aircraft owners use a close-fitting, opaque, reflective cover over the windshield. In many cases, this has done more harm than good. This cover may absorb moisture from the air and give off harmful vapors, and if it touches the surface of the plastic it can cause crazing or minute cracks to form in the windshield. Another hazard in using such a cover is that sand can blow up under the cover and scratch the plas tic. 3-42. WINDSHIELD INSTALLATION. Aircraft windshields may be purchased either from the original aircraft manufacturer or from any of several FAA-PMA sources. These windshields are formed to the exact shape re quired, but are slightly larger than necessary so they may be trimmed to the exact size. a. After removing the damaged wind- shield, clean all of the sealer from the grooves and cut the new windshield to fit. New wind shields are covered with either protective paper or film to prevent damage during handling or installation. Carefully peel back just enough of this covering to make the installation. The windshield must fit in its channels with about 1/8- to 1/4-inch clearance to allow for expan sion and contraction. If any holes are drilled in the plastic for screws, they should be about 1/8 inch oversize. Page 3-24 Par 3-40PDF Image | AFS-640
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