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be generated by a cabin fire. The PBE is a hood with a visor which is
placed over the head and seals around the neck. An oxygen generating
canister provides breathing oxygen for the user. The PBE is vacuum
sealed in a bag and stored in a box accessible to the crew. The PBE is a
throw-away unit that must be replaced whenever the vacuum seal is
broken. It is imperative that the vacuum seal be maintained since the
oxygen-generating chemicals react with moisture.
Duration of oxygen production is nominally 15 minutes depending
upon the work rate and size of the user. Useful life of a sealed PBE is 10
years from the date of manufacture.
Pilot’s Manual
PM-126A 7-13
NORMAL OPERATION
Donning the PBE:
There are two available carriers for the PBE. A portable container stored
in a cabinet behind the cockpit or a mounted container (normally mounted
to the aft side of the pedestal).
1. Remove mask from container.
a. To open the portable container,
lift the single latch
on the cover and lift.
Remove sealed bag from
the container.
b. On the mounted container,
grasp the red access handle
on the protective container
firmly and pull forcibly to
disengage the cover. When
the cover is removed from
the container, immediately
drop it. (The vacuum
sealed bag does not need to
be removed from the container
to open.) The packaged
unit may be removed
from the stowage container
prior to opening and carried
to a remote location
for use.
2. To remove the PBE from the
vacuum sealed bag, locate the
red I.D. tag and pull sharply to
tear open the vacuum sealed
bag. Reach into the opened
vacuum-sealed bag and firmly
grasp the PBE. Pull the PBE
straight out of the bag. If
necessary hold the bag with the
opposite hand.
STEP 1
Portable
Container
Mounted
Container
STEP 2
Pilot’s Manual
7-14 PM-126A
3. Place both hands inside the
neckseal opening with palms
facing each other and PBE
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
Pilot’s Manual
PM-126A 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
　
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