476
Issue date: 17 November 2006
43 of 80
19.35
Tighten both lower straps together, and then the middle straps, ensuring all the straps are pulled
evenly towards the back of the head, keeping them evenly tensioned and in line with the mask
tongues. Check and if necessary tighten the top strap. The face mask should fit securely but not
be over-tightened.
19.36
Breathe normally.
19.37
Test the constant flow of air to the face mask by briefly operating the ‘additional flow’ button on
the front of the LDV once only.
19.38
Take a deep breath and hold, do not move head. Listen for any leakage from the face mask for
approximately 8 seconds and then breathe normally. If any leaks are detected from the face mask
readjust to fit and retest. If after readjusting the leak persists, get another wearer to try the mask
to ensure it’s the mask and not the wearer that is causing the leak before removing the BA set
from service.
19.39
Take a deep breath and hold,
close
the cylinder valve,
continue to hold onto the valve
.
19.40
Take hold of the Bodyguard in other hand and observe the display for
approximately 8 seconds whilst moving your head slowly up, down and side-to-
side to ensure the face mask is not leaking outwardly (positive pressure), this
will be noted by an excessive fall in pressure shown on the Bodyguard display.
19.41
After 8 seconds slowly breathe down the contents.
Observe and listen
19.42
Observe and listen to:
(a)
The
electronic
low pressure warning and the ‘red’ and ‘blue’ LEDs flashing (operates at 84
bar).
and
(b)
The
pneumatic
low pressure warning (operates at 74 bar +/- 5 bar).
Note: due to the design of the BA set it may not be achievable for the wearer to accurately check
the actuation pressures for both low pressure warnings although they
must
be heard to actuate.
The pressure settings will be tested during any routine maintenance/repair of the BA set by OSG.
19.43
When zero is displayed (0 bar)
open
the cylinder valve slowly and fully and breathe normally,
note
this pressure and round down for entry onto the BA tally.
19.44
Take a deep breath and hold,
close
the cylinder valve,
continue to hold onto the valve
.
19.45
Breathe steadily until the air is exhausted (0 bar displayed) and the face mask collapses onto
your face.
19.46
Continue holding your breath for approximately 8 seconds whilst moving your
head slowly up, down and side-to-side to ensure the face mask is not leaking
inwardly (negative pressure), this will be noted by the face mask failing to remain
‘sucked down’ onto your face.
19.47
After 8 seconds, breathe out slightly, release sliding buckles and remove the
face mask.
19.48
Check operation of radio interface equipment if fitted.
19.49
Extend straps; wipe the face mask seal and inner mask with a damp PALTECH wipe.
