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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 adjust-ment 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.
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
08-01-15
ABNORMAL CONDITION OF OPERATION
This device produces oxygen which will vigorously accelerate combustion. Do not intentionally ex-pose 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 re-moving.
Users should be trained to recognize abnormal conditions which could signify malfunction or failure of the equipment to properly operate as follows:
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 suffi-cient 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 vol-ume in the hood. Excessive CO2 is normally indicated by breathing distress such as rapid and labored breathing accompa-nied 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.
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