Hru Replacement - mcmurdo 406 EPIRB User Manual

If you EPIRB is in an enclosure it can be tested through the test window without having to
remove the EPIRB from the housing. If you have a bracket mounted EPIRB it will have to be
removed from the bracket as described in section 5.3. The procedure for self-testing is as
follows:
• On rear of EPIRB press and hold the READY button.
• The red lamp will come on for 4 seconds to confirm test in progress.
• When the red lamp goes out, the strobe lamp must flash 3 times.
• If the strobe does not flash, or the red lamp illuminate, repeat the test then see section
10.4.
During these monthly checks you should take the opportunity to visually inspect the EPIRB
and its mountings for deterioration or damage.
On EPIRB itself check the following:
• Inspect the EPIRB for any obvious damage.
• Check there is no sign of water inside the unit.
• Check that the lanyard is not tied to the vessel structure.
• Check the battery is within its expiry date.
If you have a wall bracket:
• Confirm the bracket top clip springs up when squeezed.
• Check the EPIRB is correctly fitted and secure in its bracket.
If you have an enclosure:
• Check the HRU is within its expiry date (category 1 only).
• Confirm the cover can be manually removed with ease.
• Ensure the EPIRB base is correctly fitted into the D-shaped prongs.
If EPIRB or its mounting needs cleaning then this should be done using warm soapy water
and a damp (not wet) cloth. Do not use strong detergents or solvents.
During vessels cleansing or painting remove the EPIRB and its mounting.

10.2. HRU replacement

If you have an EPIRB in an enclosure marked Category 1 then it contains a Hydrostatic
Release Unit (HRU). This has a 2 year replacement interval. The expiry date, which is marked
on the HRU and on the enclosure side label should be checked regularly.
When the HRU expires you can obtain a replacement at a local chandler, or direct from
McMurdo at the address shown on the warranty page. McMurdo will supply an HRU kit (Part
No. 82-210B) complete with breakable plastic rod, date labels and instruction sheet. At a
chandler you should ask for a Pains Wessex „Breakthrough HRU with an EPIRB kit". The
HRU replacement procedure is as follows:
• On the enclosure, remove the R-clip and pull the cover slowly off.
• Remove the EPIRB and stow it in a dry place. It will activate if wet.
Do not paint the EPIRB or its mounting
Do not clean with detergents or solvents
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