14.06.2014 Views

TO 1-1-700 - Robins Air Force Base

TO 1-1-700 - Robins Air Force Base

TO 1-1-700 - Robins Air Force Base

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

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

f. Shield equipment from outside electromagnetic interference<br />

(EMI) sources.<br />

metal (galvanic) corrosion often occurs at antenna attach<br />

points. Inspection and treatment processes are outlined in<br />

Chapter 6 of <strong>TO</strong> 1-1-689-3. Refer to the system specific maintenance<br />

manuals for information on paint touch-up and finishing.<br />

Apply paint and coatings per procedures in <strong>TO</strong> 1-1-8.<br />

Figure 10-11. Bonding Cable Between Frame and Door<br />

10.13.1 Corrosion Prevention and Treatment for<br />

Grounding and Bonding Connections. The bonding and<br />

grounding straps used on communications and electronics<br />

equipment are highly susceptible to galvanic corrosion. In<br />

most cases, the bonding or grounding strap is made of a metal<br />

that is dissimilar to the mating surface. This creates a galvanic<br />

couple that in the presence of moisture will corrode rapidly.<br />

MIL-PRF-81733, SEALING AND COATING COMPOUND,<br />

CORROSION INHIBITIVE 48<br />

10.13.2 Electrical Bonding/Grounding. See Chapter 8 of<br />

this manual for the corrosion control measures for electrical<br />

bonding/grounding, which describes the best hardware and<br />

techniques to be used when cleaning, repairing or replacing<br />

existing connections. After the grounding or bonding connection<br />

has been made, overcoat the entire connection, including<br />

all bare areas on the metal surface, with MIL-PRF-81733,<br />

Type II, Class 1 or 2, Grade A sealant (see Chapter 8 of this<br />

manual for additional information). See <strong>TO</strong> 00-25-234 for<br />

proper procedures to be used in external earth grounding of<br />

permanent and portable structures.<br />

10.14 ANTENNAS AND RADAR SURFACES.<br />

Antenna and radar dish surfaces, hardware, connectors and<br />

electronic systems are normally exposed to fairly severe environments<br />

with dissimilar (galvanic) corrosion occurring at<br />

antenna attachment points (see Figure 10-12). Without adequate<br />

corrosion protection, these systems can fail via shorts,<br />

open circuits, loss of dielectric strength, signal attenuation,<br />

poor bonding, or electromagnetic interference (EMI). The area<br />

around the antenna mounting to a shelter or van is susceptible<br />

to moisture intrusion from rain and condensation. Dissimilar<br />

Figure 10-12. ANTPS-75 Antenna Radar Surface<br />

10.15 VAN AND TRAILER UNDERCARRIAGES.<br />

10.15.1 Shelter Underbody. The undercarriage or underbody<br />

of tactical shelters are susceptible to corrosion (see Figure<br />

10-13). Inspect the underbody coating for chipped,<br />

cracked, or loose coating and bare metal. If the deficiency is<br />

determined to warrant repair, see the system specific shelter<br />

maintenance manual for cleaning, repair, treatment, and painting.<br />

MIL-T-81772, THINNER, POLYURETHANE 70<br />

Blowing dry air or nitrogen to evaporate solvent can<br />

create airborne particles which may enter the eyes.<br />

<strong>Air</strong> pressure for drying shall not exceed 30 PSI at the<br />

nozzle. Eye protection is required. Failure to comply<br />

may cause personnel injury resulting form exposure<br />

to airborne particles.<br />

a. Completely clean the undercarriage. Scrape off defective<br />

coating using a putty knife and Specification MIL-<br />

T-81772, Type I, Polyurethane Coating thinner.<br />

b. Mask affected areas in accordance with <strong>TO</strong> 1-1-8.<br />

10-11

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!