Learjet 60 - Page 274

Learjet 60

Pilot's
Manual
Following
actuation, the hood will inflate over a 15-20
second period .
After
this period, the starter candle will cease flowing
and the only
sound
will be slight rustling of the fabric on
each inhalation and exha-
lation
. Dependent upon breathing rate, there
will
be a slight
exhala-
tion resistance as the exhaled
breath is forced through the oxygen-
generating canister . Inhalation
resistance will be almost unrecogniza-
ble since inhalation
is directly from the interior of the hood through
a
diaphragm type
check valve located at the base of the oronasal
mask .
The visor should remain
clear of fogging or misting . Heat is produced
by both the chemical air regeneration
process and transfer of
body
heat
during the rebreathing cycle . Heat
build-up within the hood is
normal and is
dependent upon the amount
of work performed . There
should be no
irritating or strong unusual
odors within the hood . Op-
erational
duration is variable dependent
upon the amount of
work
performed
by the user .
If the PBE is worn to exhaustion of
the chemical
regeneration system,
this
will
be
evidenced by a gradual
reduction in
the expended volume
of
the hood until the
point that the hood is
collapsed tightly around
the head at the end
of a full inhalation .
Additionally, there
will be a
rapid buildup of
heat and moisture in
the hood as the canister
looses
its effectiveness .
At this point, the wearer
should immediately
retire
to a safe breathing
area clear of flame
and toxic fumes and
remove the
device .
Removing the PBE :
1 . Go to a safe area away from
immediate
contact with fire or
open
flame
and/or toxic fumes .
2 . With
both hands, reach
for the two
lower corners of the
visor
area
and push forward
on the metal tabs
of the adjustment
strap
buckles to release
the strap tension .
3 .
Place both hands
under the neckseal in
forward area
and pull
up, guiding the oronasal
cone and
neckseal over
the face/
glasses
until the PBE is
clear of the head
.
4 . Place
the expended PBE
in a safe place
to cool away
from fire or
exposure to water
.
Disposal
:
The expended
PBE still contains
unreacted
oxidizing material
and
strong
alkali materials
. At the
completion of flight,
it must be
turned
over to maintenance
for authorized
disposal .
PM-123

7- 1 3
Change 2