Andrew operation and maintenance Specifications download pdf (Page 66)

Chapter 4 - Maintenance

42S315F 4-8

2. Application:

a. Clean entire area around damaged portion with solvent cleaners

followed by thorough wash with detergent and water. Rinse well

and dry with clean cheesecloth. Do not recoat for 30 minutes or

until surface is completely dry.

b. Damaged coatings may be repaired by fairing the damaged edges

with 320 grit or finer sandpaper. Primer system must be

reapplied if damage extends into the bare metal.

c. If recoating is to be accomplished in ambient temperatures higher

than 100 degrees Fahrenheit, top coating shall be thinned with

XYLENE. If coating appears too dry or grainy, add up to 50

percent mineral spirits to slow the evaporation rate.

NOTE

The top coat may be thinned in ratios up to two

parts paint to one part thinner.

d. If repriming is required, apply a thin coat of wash primer and

allow to dry for 15 to 30 minutes. Apply a full coat of zinc

chromate primer and allow to dry for 2 hours. If surface is not

smooth after drying, sand with 320 grit paper lubricated with

toluene. Remove dust using a tack cloth (cheesecloth lightly

coated with toluene).

4.3.3 Fasteners

The fasteners need to be checked to make sure they are in place and have not

loosened. If a fastener is found to be loose, or there is cause to check all the

fasteners, use a torque wrench to obtain the proper bolt tension. Torque

values are given in Table 2-2 and repeated in Table 4-1 which follows.

NOTE

Galvanized ATM A325 high-strength structural bolts should

not be reused. Retightening previously tightened bolts, which

have been loosened by the tightening of adjacent bolts, is not

considered to be a reuse.

If a fastener should fail and it does not appear to be a result of corrosion,

please notify ViaSat as soon as possible.

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Andrew operation and maintenance Specifications Page 66