General Dynamics 500-0646, Operation Manual

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500-0646A 20
Step 2. Place the first two upper panels between #1 and #2 radial beams, and insert the #10
screws in each hole. Tighten the screws along radial #1 (center radial) only.
CAUTION! IN ORDER FOR THE PANEL AND THE RADIAL BEAM CONTOURS
TO FIT EACH OTHER CORRECTLY, BE SURE THAT THERE ARE NO
GAPS OR FOREIGN MATTER BETWEEN THE TOP OF THE RADIAL
AND THE BOTTOM OF THE PANEL.
Note: Ensure that lubricant has been applied to all hardware to prevent galling
and to ease disassembly.
Note: Holes in the panels should line up with the holes in the radials when the
parts are in their correct positions. An awl may be useful in assisting
alignment.
Step 3. Place the next two lower panels between #1 and #2 radial beams (below the panel in
Step 2) and insert the #10 screws in each hole. Tighten the screws along the radial
#1 (center radial) only.
Step 4. Insert and tighten the screws that join the upper and lower panels together
(see Figure 13).
Step 5. Starting from the top and working in sequence toward the hub, tighten the remaining
screws on the outer and lower panel installed in Step 2 and Step 3.
Step 6. Repeat the installation procedure from Step 2 through Step 5 above for each panel
section. Work from the middle toward the outer edge of the reflector. See Figure 14
for order of installation.
Step 7. Completely tighten all the stainless steel hardware on the previously installed lacing
members from Section 2.2.5. Be sure that there are no twists to the radial beam
structures while tightening the lacing members.
CAUTION! DO NOT PUSH OR TWIST THE LACING BRACES OR DAMAGE TO
THE REFLECTOR STRUCTURE MAY OCCUR. ONLY ROTATE THEM
SLOWLY UNTIL FINDING THE RIGHT PLANE IN WHICH ALL THE
SURFACES BECOME FLUSH AND ARE EASILY BOLTED
TOGETHER.
CAUTION! TIGHTEN THE HARDWARE CONNECTING THE ANGLE CLIPS TO
THE RADIALS FIRST, THEN TIGHTEN THE HARDWARE
CONNECTING THE LACING THE ANGLE CLIP.
2.2.7 Feed Boom Structure
Note: All hardware in this section is to be loosely installed. They will be
tightened after the feed boom alignment.
Step 1. Rotate the antenna upright by turning the elevation jack until the antenna is rotated
about 90° as indicated in Figure 15.
Step 2. Attach the left and the right feed booms to the bottom of the hub weldment with six
5/8" x 1-3/4" [15.875mm x 44.45mm] hot-dip galvanized bolts and tighten them. (see
Figure 16).
Step 3. Install the two feed boom gussets to the hub and feed boom with 1/2" x 1-1/2"
[12.7mm x 38.1mm] stainless steel hardware (see Figure 16).