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C64.65201 Issue 3
Jun 2019
Scope fitted in a 4 aspect head – 3 aspect tall housing scopes are fitted in the same position
These two variants require the removal and retention of the plastic module spacer
fitted to the pivot bar to give enough clearance for the scope to be fitted.
Alternatively, unlock the module and lift off the pivot bar then slide the spacers into
the centre of the bar.
The alignment scope will not locate and fit properly unless the spacer is
moved from its normal operating position
Once the alignment procedure is complete, refit the module spacer to the pivot bar
with the flange end closest to the module. They are a ‘snap fit’ and will rotate freely
on the bar when fitted correctly or where the spacers were moved to a different
position on the bar return them to their original position.
The spacers centralise the module in its aperture and prevent the visor fretting
on the backboard, so must be returned to their operational positions when the scope
is removed
3 Aspect Short Housing
This signal uses an adaptor block to align the scope with the hole in the backboard
as shown: