DOC AIRBUS | AMM A320FFLIGHT CREW PORTABLE DEVICES - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The flight-crew breathing-hood system gives protection to the eyes and respiratory system for the crew members.
It is used in the conditions that follow:
** ON A/C NOT FOR ALL The flight-crew breathing-hood system gives protection to the eyes and respiratory system for the crew members.
It is used in the conditions that follow:
- Fire
- Smoke and poisonous fumes.
2. Component Location
The hood container is installed in the cockpit, in the right aft console (702VU).
** ON A/C NOT FOR ALL The hood container is installed in the cockpit, in the right aft console (702VU).
Breathing Hood Container| FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS DOOR | ATA REF |
|---|---|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||||
| 5776HM | HOOD-SMOKE | 212 | 21-20-00 | ||
3. System Description
A. Breathing Hood System
(1) Stowage
The breathing hood is stowed in a specially-made vacuum sachet (aluminized bag) with a vacuum protection.
This sachet has a serviceability indicator around it. It is put stowed in a light-weight hood container.
After you open the hood container, you can open the vacuum protection of the sachet. Then, you can remove the breathing hood in one movement.
The breathing hood is stowed in a specially-made vacuum sachet (aluminized bag) with a vacuum protection.
This sachet has a serviceability indicator around it. It is put stowed in a light-weight hood container.
After you open the hood container, you can open the vacuum protection of the sachet. Then, you can remove the breathing hood in one movement.
(2) Description
The hood container and its cover have the components that follow:
The hood container and its cover have the components that follow:
- Two inspection windows to see the serviceability indicator (serviceable color: yellow) and a container seal for the pre-flight inspection
- A handle
- A hinge to attach the cover to the hood container
- A pictogram which tells you how to use the breathing hood
- An identification plate with the manufacturing date, installed on the side of the hood container.
(3) The breathing hood has the technical properties that follow:
- Minimum air supply time: 15 minutes
- Breathing capacity: 6 l
- Operational temperature: -18 deg.C (0 deg.F) to +55 deg.C (131 deg.F).
B. Description of the Protective Breathing-Hood Equipment
The protective breathing-hood equipment has three primary parts:
The protective breathing-hood equipment has three primary parts:
(1) A smoke hood
The smoke hood has the components that follow:
The smoke hood has the components that follow:
- A neck seal
- A strap that goes around the head and a strap that keeps the oronasal mask (also referred to as the inner mask) on the face of the user
- A relief valve that keeps the overpressure in the smoke hood at a correct level.
(2) An oronasal mask (or inner mask)
The oronasal mask has the components that follow:
The oronasal mask has the components that follow:
- A safety check valve, operated by a higher breathing resistance. The user can breathe through this valve the air that is between the head and the smoke hood. If the breathing bag is empty, it is possible to breathe from the external closed-loop breathing-system with the mask or the hood on.
- A voice transmitter, in the front part of the oronasal mask.
(3) A KO2 cartridge
This cartridge has the components that follow:
This cartridge has the components that follow:
- An attached breathing bag with a volume-controlled relief valve:
This valve keeps the breathing resistance for exhalation at a low correct level also when the breathing bag is full. - A starter with a lanyard to operate it
- A flexible hose for the connection with the oronasal mask
- A belt that keeps the cartridge attached to the hood.
4. Operation/Control and Indicating
A. Operation
The protective breathing hood operates with a closed breathing circuit.
The breathed-out air is regenerated, enriched with oxygen, and breathed in again.
The exothermic chemical reaction, which occurs with the breathed-out air, between the potassium superoxide (KO2), the humidity and the carbon dioxide (CO2) supplies oxygen. This reaction also releases heat.
The protective breathing hood operates with a closed breathing circuit.
The breathed-out air is regenerated, enriched with oxygen, and breathed in again.
The exothermic chemical reaction, which occurs with the breathed-out air, between the potassium superoxide (KO2), the humidity and the carbon dioxide (CO2) supplies oxygen. This reaction also releases heat.
C. Indicating
The breathing hood is serviceable when the serviceability indicator is yellow.
The container seal shows that the hood container is serviceable.
You must replace the protective breathing equipment in the conditions that follow:
The breathing hood is serviceable when the serviceability indicator is yellow.
The container seal shows that the hood container is serviceable.
You must replace the protective breathing equipment in the conditions that follow:
- The serviceability indicator is broken.
- The serviceability indicator is not yellow.
- You cannot see the serviceability indicator.
- The container seal is broken.