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TO 1-1-700 - Robins Air Force Base

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<strong>TO</strong> 1-1-<strong>700</strong><br />

10.8 STEEL CABLES.<br />

Whether made of plain low carbon steel or stainless steel<br />

(CRES), cables are highly susceptible to corrosion. The presence<br />

of bare spots or cracks (see Figure 10-9) in the plastic<br />

cladding on clad cables and gaps where the protective CPC<br />

coating is missing on other cables are the main contributing<br />

factors to the corrosion of cables. Dirt, grime, and rust that<br />

collect between cable strands lead to more severe corrosion<br />

and wear that eventually cause cable failure. Inspect accessible<br />

cables for these conditions as well as for signs of wear, fraying,<br />

binding, kinks, excessive dirt/grease build-up, and corrosion.<br />

Check the cable for corrosion by twisting the fibers and<br />

checking for rust in the interior of the cable. Use the following<br />

procedures to treat steel cable corrosion:<br />

Solvent to clean steel cables. Excessive solvent<br />

will remove internal cable lubricant and allow the<br />

cable strands to abrade and further corrode.<br />

a. If the surface of a cable is corroded, relieve cable tension<br />

and carefully force the cable open by reverse twisting.<br />

Visually inspect the interior. Corrosion on the<br />

interior strands constitutes failure and the cable must be<br />

replaced.<br />

b. If no internal corrosion is detected, remove loose external<br />

rust/corrosion with a clean, dry, coarse-weave rag or<br />

fiber brush and clean the cable with a clean cloth dampened<br />

with MIL-PRF-680, MIL-PRF-32295, Type II, or<br />

A-A-59601, Type II or III Dry Cleaning/Degreasing<br />

Solvent or other cleaner as specified by system-specific<br />

manuals or the equipment<br />

c. SPM.<br />

MIL-PRF-32295, TYPE II, CLEANER, NON-AQUEOUS,<br />

LOW-VOC, HAP-FREE<br />

Figure 10-9. Steel Control Cables<br />

MIL-PRF-81309, LUBRICANT, CORROSION PREVEN-<br />

TIVE COMPOUND 46<br />

MIL-PRF-680 AND A-A-59601, SOLVENT, DEGREASING,<br />

TYPE II AND III 45<br />

MIL-L-87177, LUBRICANT, CORROSION PREVENTIVE<br />

COMPOUND, WATER DISPLACING 32<br />

• Consult the applicable system specific maintenance<br />

manual for cable de-tensioning and tensioning<br />

requirements prior to performing any maintenance<br />

on pre-tensioned cables.<br />

• Do not use metallic wools to clean steel cables.<br />

The use of metallic wool will cause dissimilar metal<br />

particles to become embedded in the cables and<br />

create further corrosion problems (galvanic corrosion).<br />

Use only a clean cloth dampened with, MIL-<br />

PRF-680, MIL-PRF-32295, Type II, or A-A-<br />

59601, Type II or III Dry Cleaning/Degreasing<br />

MIL-PRF-16173, COMPOUND, CORROSION PREVEN-<br />

TIVE 37<br />

c. After thorough cleaning, apply a thin film of either<br />

MIL-PRF-81309, Type II; MIL-L-87177, Type I or II,<br />

Grade B; or MIL-PRF-16173, Class II, Grade 4 Water<br />

Displacing CPC to the cable surface either by aerosol<br />

spray or with a cloth dampened with the CPC. Follow<br />

with a liberal amount of MIL-PRF-16173, Class II,<br />

Grade 4 CPC applied with a non-metallic bristle brush.<br />

Wipe off any excess CPC as excessive CPC build up<br />

will interfere with the operation of cables at fairleads,<br />

pulleys, or grooved bell-crank areas.<br />

10-8 Change 3

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