User manual

23
Category 1 enclosure HRU replacement
The HRU has a mandatory 2 year service replacement interval.
WARNING: Failure to replace the HRU after 2 years in service has elapsed may
result in the EPIRB not automatically deploying in an emergency.
CAUTION: It is most important that all of the supplied replacement parts are fitted,
never reuse an old plastic rod or fixing E-clip.
Only ever fit an original McMurdo replacement HRU Kit:
Part No.82-962-001A. McMurdo Breakthru HRU,
The kit includes HRU, a replacement breakable plastic rod, e-clip, washer, date labels
and instruction sheet.
HRU replacement procedure:
1. Remove enclosure R-clip and cover
2. Remove the EPIRB, stow it in a dry place It may activate if allowed to get wet
3. Hold down the lever arm to take up the force of the spring
4. Push the HRU back then upwards out of the slot in the lever arm
5. When the rear clip disengages slowly release the lever arm
6. The HRU with its breakable rod can now be lifted free and replaced
7. Fit the new HRU over the new rod, with its label facing outward
8. Fit the replacement washer and new E-clip, ensure rod moves freely
9. Mark the HRU with an expiry date 2 years into the future
10. Slide the HRU into the slot in the lever arm and push lever arm down
11. Engage rear washer into back-plate by pushing back and sliding down
12. Look under the spring and check that the washer is fully engaged
13. Re-Fit the EPIRB, cover and R-clip
14. On side of cover, remove old HRU expiry date and mark new date.
1
2
Breakable rod
HRU
Lever arm
Spring
Engage
washer here
Rear E-clip
Fitting HRU
Washer