A-325 Tensioning
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
15
During the installation process, there are several references to the A-325 hardware ten-
sioning procedure. The A-325 hardware must be properly tensioned to avoid slippage
between bolted surfaces under high loads. Slippage can cause the corresponding
assembly to move, causing antenna misalignment. When designated, the A-325 hard-
ware should be tightened according to the following tensioning procedure.
NOTE:
Tensioned bolts are for final connections only and should not be loosened for
reuse.
Lubricate the bolt threads with the provided stick wax to reduce friction.
Insert the bolt, and add a flat washer—if required.
Do not
allow wax under the flat
washer.
Add the nut, and finger tighten.
After the connections are complete, tighten the bolts until the surfaces are joined and
the nuts are snug (for example, full effort of a person using an ordinary spud wrench).
Do not proceed with Steps 5 and 6, unless the connection is final and is not intended to
be loosened again.
Note:
If the bolts are loosened after Steps 5 and 6, discard and replace with new hard-
ware.
Using a felt-tip marker, mark the nuts and the ends of the bolts with a straight line as
shown in Figure 3-1a and Figure 3-1b.
Tighten the nuts further with an extra long wrench until the nuts are moved 1/3 turn (120
degrees) as shown in
Figure 3-1a for bolt lengths less than four diameters
and 1/2
turn (180 degrees) as shown in
Figure 3-1b for bolt lengths over four diameters
.
Figure 3-1a: A-325 Tensioning Procedure
Figure 3-1b: A-325 Tensioning
For bolts less than 4 diameters
For bolts over four diameters
Installation Procedures
Use Felt Marker
Before
Tensioning
After
Tensioning
Use Felt Marker
Before
Tensioning
After
Tensioning
