Specifications

Chapter 2 - Installation
42S315F 2-12
22. Attach next five clockwise strut and truss assemblies as described in steps 3
and 4. After each strut and truss assembly is installed, install intercostals as
described in steps 6 through 8.
Secure hardware finger tight.
23. Attach next clockwise strut and spar truss assemblies as described in steps
10 and 11. Then install intercostals as described in steps 12 through 16.
Secure hardware finger tight.
24. Attach the last two clockwise strut and truss assemblies as described in steps
3 and 4. After each strut and truss assembly is installed, install intercostals
as described in steps 6 through 8.
Secure hardware finger tight.
2.4.6.2 Installation of the Spars and Subreflector
Refer to drawing 517577C, 9-Meter Reflector Assembly, for the following
procedure. Study sheet 3 to understand how the subreflector and spars fit
together. Proceed with the assembly according to the following procedures:
1. Assemble four spars (item 16 drawing 517577 sheet 3, zone B-2) to top spar
fitting (item 15) with 8 screws (item 8), 16 washers (item 9), and 8 nuts (item
10).
Secure hardware finger tight.
2. Attach the subreflector support frame (item 6 drawing 517577 sheet 3, zone
C-3) to the mounting frame (item 7) using three screws (item 8), six washers
(item 9), and three nuts (item 10) in the three adjusting slots.
Secure
hardware finger tight.
3. Attach three threaded rods (item 12 drawing 517577 sheet 3, zone B-4) to the
frames (items 6 and 7) using eight washers (item 9) and eight nuts (item 10)
on each rod.
Secure hardware finger tight.
4. Lift the frame assembly up to the spar assembly. Attach the mounting frame
(item 7 drawing 517577 sheet 3, zone B-4) to the spars using four screws
(item 8), eight washers (item 9), and four nuts (item 10).
Secure hardware
finger tight.
5. Set the subreflector (item 5 drawing 517577 sheet 3, zone B-4) concave side
up on a padded surface for protection.
6. Install a nut (item 13) and a washer (item 11) onto each threaded stud (item
14) approximately 1.5 inches [3.8 cm] from the end, and screw the same end
of each stud into one of the machined boss on the subreflector.
7. Install a nut (item 13) onto each threaded stud (item 14) approximately 3
inches [7.6 cm] from the free end, and place a washer (item 11) over the end
of the stud and onto the nut.
8. Lift the subreflector up to the support frame and insert the studs into the
corresponding holes in the frame. Secure the subreflector using three
washers (item 11) and three nuts (item 13).
9. Choke a nylon strap around the spar assembly top fitting and attach it to the
lifting hook of the crane.