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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-126A
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-126A 7-17
Failure of the Starter Candle
If the starter candle fails to actuate when the adjustment strap is pulled,
an additional sharp pull on the strap may be sufficient to dislodge the
lanyard pin and actuate the device. If the device still fails to actuate, the
hood will continue to function, although the initial purge capability is
lost. Sticking the fingers into the neckseal to allow a large lung
inhalation may be required to enable sufficient breathing volume until
the chemical regeneration system begins producing a surplus of
oxygen.
Inadequate Oronasal Mask Seal
Absence of a tight seal of the oronasal cone to the face may result in
excess leakage of the exhaled breath into the hood, short circuiting the
oxygen-generating canister. This condition may result in a build-up of
CO2 within the rebreathing volume in the hood. Excessive CO2 is
normally indicated by breathing distress such as rapid and labored
breathing accompanied by a general feeling of insufficient ability to get
one’s breath, although there is no restriction to breathing. Presence of
moisture or fogging on the visor and the sensation of air escaping from
the mask, particularly around the nose and eyes, are indications of a
lack of proper fit. Adjustment of the mask straps and mask position to
minimize leakage should rapidly alleviate the problem. If the
perception of breathing distress persists, the user should quickly go to
a safe area and remove the PBE and don alternate breathing equipment
if required.
Loss of Infiltration Seal
The smoke and toxic fumes generated by the combustion of most
aircraft cabin interior materials has many strong irritants. The
continued presence of strong irritation odors inside the hood resulting
in eye and respiratory tract discomfort is a good indicator of the lack of
an effective infiltration seal. Verify that the seal is in contact with the
skin or the neck and does not have clothing or jewelry trapped in the
seal, or hair protruding between the seal and the neck. If the condition
persists, or there is evidence of a tear in the neckseal, the user should go
quickly to a safe area and don alternate breathing equipment if
required.
FLOTATION EQUIPMENT
Life vests are stowed in plastic compartments located behind the pilot’s
and copilot’s seats, and in the lavatory adjacent to the toilet seat (on toilet
seats with seat belts). They also may be stowed in a compartment at
the front of each passenger seat. The life vests are inflated by pulling the
red CO2 release tabs. On aircraft 45-232, 45-236 thru 45-2000, each passenger
seat cushion has been designed to also be used as a personal flotation
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