TO 1-1-700 - Robins Air Force Base
TO 1-1-700 - Robins Air Force Base
TO 1-1-700 - Robins Air Force Base
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<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