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AC 43.13-1B 9/8/98 FIGURE 7-20. Pulley wear patterns. n. Inspect fair-leads for wear, breakage, alignment, cleanliness, and security. Examine cable routing at fair-leads to ensure that defec tion angles are no greater than 3°€maximum. Determine that all guides and anti-abrasion strips are secure and in good condition. o. Examine pressure seals for wear and/or material deterioration. Seal guards should be positioned to prevent jamming of a pulley in case pressure seal fails and pieces slide along the cable. 7-150. CORROSION AND RUST PRE- VENTION. To ensure a satisfactory service life for aircraft control cables, use a cable lu bricant to reduce internal friction and prevent corrosion. a. If the cable is made from tinned steel, coat the cable with rust-preventive oil, and wipe off any excess. It should be noted that corrosion-resistant steel cable does not require this treatment for rust prevention. b. Lubrication and corrosion preventive treatment of carbon steel cables may be ef fected simultaneously by application of com pound MIL-C-16173, grade 4, or MIL-C-11796, Class I. MIL-C-16173 com pound should be brushed, sprayed, or wiped on the cable to the extent it penetrates into the strands and adequately covers the cable sur faces. It will dry “tack free” in 24 hours at 77 °F. MIL-C-11796 compound is applied by dipping the cable for 1/2 minute into a tank of compoundheatedto77°±5°C(170°±9°F) for 1/2 minute then removing it and wiping off the excess oil. (An example of cable corro sion, attributable to battery acid, is shown in figure 7-21.) Page 7-38 Par 7-149PDF Image | AFS-640
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