P.O. Box 369,
La Verne, CA 91750-0369,
Phone (714) 392-5833,
Fax (714) 392-5838,
B. Milliohmmeter - 0 to 0.1 ohm range
3. Check Nose Radome
A. Check for holes, scuffs, cracks, blisters, and delamination.
NOTE: Delamination can be detected by tapping the radome skin with a small metallic object. For example, a short socket extension.
B. Check for moisture.
NOTE: The moisture register detects moisture by measuring conductivity of radome material. The register consists of two major parts: the gun which contains electrodes and oscillator circuits, and the case containing ON-OFF switch, meter zeroing control, and batteries.
(1)
Position gun part of register at least 3 inches from any object.
NOTE: Any object cose to gun will influence meter zeroing adjustment.
(2)
Press ON-OFF pushbutton switch on case of register to ON.
(a) Register must remain on throughout entire check.
NOTE: Allow register a few seconds to stabilize. With the adjustment knob to left of handle, adjust needle to exactly "O" on the dial.
(3)
Open radome and position gun part of register so that gun electrodes contact inner surface of radome. Make sure all eight electrodes contact radome surface.
(4)
Move gun over entire inner surface of radome and observe meter on case.
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(a) Meter indication must stay within GOOD (0-5) range.
RADOME CONDITION COLOR NUMERICAL SCALE Good Green 0 to 5 Fair Yellow 5 to 10 Poor Orange 10 to 20 Unacceptable Red 20 to 50
(5)
Move gun around areas (spots) having meter indications.
(6)
If there is any indication of the presence of moisture (above 5 on scale), the area should be dried out and resealed.
(7)
Repair damage, if any (Ref 53-52-0 AR).
C. Check Conductor Straps and Diverter Strips
(1) Check visually.
(a)
Check thin gage aluminum conductor strips for tears, lifting, looseness, burned areas, general deterioration and security under bonding screws.
(b)
Check aluminum diverter strips for security of mounting, burns, burned areas, and corrosion.
NOTE: Sharp corners or points anywhere along a conductive strip will tend to cause radio interference.
(2)
Check conductivity.
(a)
With radome open, measure resistance between forward end of diverter strips and conductor strip. Resistances should be 0.1 ohm or less. A test probe with a sharp tip should be used to penetrate paint or epoxy on strip.
(b)
With radome closed, measure resistance between diverter strips on radome and body structure skin. Maximum resistance not to exceed 0.1 ohm.
(3)
If damage exists, replace radome (Ref 53-52-0 R/I).
D. Check Glide Slope Antenna Director Bar
(1) Check glide slope antenna director bar for damage and security of adhesion. If necessary, replace bar (Ref 53-52-31 R/I).
E. Check nose radome seal. Replace seal if necessary (Ref 53-52-0 R/I).
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NOSE RADOME - CLEANING/PAINTING
1. Nose Radome Painting
A. General
(1)
Three paint systems are used on the nose radome: Prestec enamel, Super Koropon Anti-Static Coating and BMS 10-60, Type II enamel.
(2)
For antistatic exterior coating refer to par. B., Nose Radome Painting. Nose radome tip erosion coating is applied from nose tip to station 138.6 per 53-52-21 AR.
B. Nose Radome Painting - Prestec Enamel
(1) General
(a)
The Prestec enamel is a white polyester paint.
(b)
Bare (uncoated) fiberglass surfaces should not be exposed to outdoor weathering and moisture. Radomes in this condition, however, may be kept on the airplane during transportation providing total time of outdoor exposure does not exceed 7 days.
(c)
Store methyl ethyl ketone peroxide in a cool, ventilated, and isolated facility (e.g., approved refrigerated unit or underground storage) away from buildings, combustible materials, reducing agents, catalysts, and sources of ignition and as approved by the fire unit.
(d)
Return small (less than 2 ounces) quantities of unused solution to approved storage area or dispose of it by diluting with large amount of water. Do not pour leftover solution back into original container.
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