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visor facing downward with
the oxygen generating canister
resting on the tip of the
hands.
4. With the top of the head bent
forward, guide the PBE neckseal
over the top of the head
and down over the face using
the hands to shield the face
and glasses from the oronasal
mask cone.
5. With both hands, grasp the
adjustment straps at the
lower corners of the visor and
pull outward sharply to actuate
the starter candle. Within
1 to 5 seconds, a rushing
noise of oxygen entering the
hood will be heard and inflation
will be evident.
.
Human hair is
highly flammable. Hair that protrudes through the
neckseal could ignite if brought into direct contact
with flame.
6. With the straps still in hand
and head bent forward, pull
backward to secure the oronasal
mask cone high on the
nose for a tight seal.
STEP 3
STEP 4
STEP 5
WARNING
STEP 6 A25-1031
Pilot’s Manual
PM-132A 7-15
7. If wearing glasses, adjust
their position to rest on the
tip of the oronasal mask cone
by moving the sides of the
frame through the hood fabric.
Do not attempt to adjust
through the neckseal as this
will result in infiltration of
the surrounding atmosphere
into the interior of the hood.
8. When the neckseal is positioned
at the neck and the
oxygen generating canister is
resting on the nape of the
neck, remove the hands,
checking to see that clothing
is not trapped in the seal and
hair does not protrude
between the seal and the
neck. Pull the protective neck
shield down to cover the collar
and upper shoulder area.
Following actuation, the hood will inflate over a 15- to 20-second
period. After this period, the starter candle will cease flowing and the
only sound will be a slight rustling of the fabric on each inhalation and
exhalation. Dependent upon breathing rate, there will be a slight
exhalation resistance as the exhaled breath is forced through the
oxygen generating canister. Inhalation resistance will be almost
unrecognizable 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. Operational duration is variable dependent upon the
amount of work performed by the user.
STEP 7
STEP 8
Pilot’s Manual
7-16 PM-132A
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 loses 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 the 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.
ABNORMAL CONDITION OF OPERATION
This device produces oxygen which will vigorously
accelerate combustion. Do not intentionally expose
the device to direct flame contact, or remove in the
immediate presence of fire or flame. Due to oxygen
saturation of the hair, do not smoke or become
exposed to fire or flame immediately after removing.
Users should be trained to recognize abnormal conditions which could
signify malfunction or failure of the equipment to properly operate as
follows:
CAUTION
Pilot’s Manual
PM-132A 7-17
Failure of the Starter Candle
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