User's Manual

20
a 4mm Allen key to tighten the bolts. If the rear of the mounting surface is inaccessible,
use the self-tapping screws supplied. Always fit washers under heads of the screws to
avoid damaging the plastic.
9.3 Mounting instruction plate
The Precision 406 is supplied with a rigid plate giving visual instructions on how to
operate the Precision 406 in an emergency. Mount this next to your EPIRB as
explained in section 8.3.
9.4 Marking HRU expiry
If you are installing a float-free Precision 406 you
must
now mark the HRU expiry date.
The HRU has a 2 year in-service life which starts as soon as it gets exposure to a
marine environment. Hence the 2 years starts at installation and it is left to the
customer to mark this date during installation. A date 2 years into the future should be
marked on the HRU body and copied onto the label on the side of the enclosure. The
HRU is marked by cutting out the corresponding dates on its label. The enclosure
should be marked using the alpha-numeric stickers provided, then covering them with
the clear sticky label provided (but see 9.5 first). The preferred date format is month
and year, for example : JUN 2001.
150mm
(5.9")
84mm (3.3")
44mm
(1.73")
104mm
(4.1")
150mm
(5.9")
440mm
(17.3")
140mm
(5.5")
OBSTRUCTION FREE AREA
0.8m x 0.5m (32" x 20")