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The PBE is a hood device which completely encloses the head of the wearer and seals at the neck with a thin elastic membrane. The chemical air regeneration system is based on the use of potassium superoxide (KO2). It is silently and reliably powered by the exhalation of the wearer into an oronasal mask cone located within the hood.
The hood encloses the head of the wearer and is sealed to the wearer by the neckseal. The enclosed volume of the hood represents approximately 8 liters available rebreathing volume. The oronasal mask serves to direct the exhaled breath containing CO2 and water vapor back through the KO2 bed where excess moisture and CO2 are removed, and drier oxygen is added for return into the hood volume. Inhalation is accomplished directly from the interior of the hood through the inhalation valve located on the oronasal mask. A relief valve located at the back of the hood is used to prevent buildup of excessive pressure within the hood, and to provide emergency pressure relief in the event of a sudden reduction in cabin pressure. The chlorate starter candle mounted on the bottom of the KO2 canister discharges directly into the canister.
The chlorate starter candle is designed to deliver a fixed volume of approximately 8 liters of oxygen over a short duration of less than 20 seconds. It is contained in a small stainless steel cylinder affixed to the base of the KO2 canister. The discharge is directed into the interior of the KO2 canister. The chlorate candle is initiated by a spring loaded plunger striking a small percussion primer when the lanyard attached to the hood adjustment strap is pulled.
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 exhalation. Dependent upon breathing rate, there will be a slight exhalation resistance as the exhaled breath is forced through the KO2 canister. Heat is produced by both the chemical air regeneration process and transfer of body heat during the rebreathing cycle. Heat buildup within the hood is normal and is dependent upon the amount of work performed.
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There should be no irritating or strong unusual odors within the hood. The equipment is designed to accommodate the requirements of the most demanding situations. It is optimized to provide a minimum of 15 minutes duration for the heaviest workload (duration is 15 to 30 minutes depending on users work rate). IF the PBE is worn to exhaustion of the chemical regeneration system, this will be evidenced by a gradual reduction in the expanded volume of the hood until the point that the hood is collapsed tightly around the head at the end of a full inhalation. At this point, the wearer should immediately retire to a safe breathing area clear of flame and toxic fumes and remove the device.
Operation
Remove the aluminized vacuum sealed pouch from the protective canister. Tear open the pouch and don the hood.
Pull the adjustment straps to secure the hood. This motion automatically activates the chemical oxygen system by removing a lanyard pin from the chemical canister located at the back of the hood.
The generated oxygen will inflate the hood, providing the initial breathing atmosphere. Pull the straps again if actuation fails. (The hood will continue to function, although the initial breathing atmosphere is not available. Stick fingers under the neckseal to allow a lung inhalation to enable breathing until the chemical regeneration system begins producing a surplus of oxygen.)
The initial generated oxygen inflates the hood, providing breathable atmosphere. As the wearer begins to breathe normally, the exhaled breath is directed through the chemical canister, which removes water vapor, carbon dioxide, and adds oxygen before the gas is returned to the interior of the hood for inhalation.
Excessive leakage of the oral/nasal cone or the neckseal may result in excessive build up of carbon dioxide. Signs of excessive build up are: rapid or labored breathing, moisture or fogging on the visor, strong irritating odors, and eye or respiratory tract discomfort. In this instance, move away from immediate contact with the fire, open flame/toxic fumes, and remove the hood. Don an alternate hood if required.
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Many Methodikal Emergencies (Progressive Failures) in the MD-80 have started with a generator failure. A generator failure will place a severe load on the generator’s constant speed drive, causing fluctuating and eventually destructive vibration. This vibration will lead to a hydraulic pump failure. Failure of either the generator drive or the hydraulic pump will almost certainly result in a catastrophic failure of the engine accessory drive case. This failure might cause the engine to explode.
Caution must be exercised under these circumstances because of the reduced hydraulic flight control availability which causes longitudinal yaw and vertical pitch flight control problems. Whenever possible, avoid clouds because of electrical power failure and the loss of the Captain’s flight instrument computer and radio. Land as soon as practical at a CAL Primary Maintenance Airport. The following must be considered:
　
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